-
Digidesign Inc.
3401-A Hillview AvenuePalo Alto, CA 94304 USA
tel: 6508427900fax: 6508427999
Technical Support (USA)
65084266996508564275
Product Information
65084266028003332137
Digidesign888|24 I/O Audio Interface
Installation GuideFax on Demand1-888-USE-DIGI (873-3444)
World Wide Webwww.digidesign.com
Digidesign FTP Siteftp.digidesign.com
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Copyright
This Users Guide is copyrighted 1999 by Digidesign, a division
of Avid Technology, Inc. (hereafter Digidesign), with all rights
reserved. Under copyright laws, this manual may not be duplicated
in whole or in part without the written consent of Digidesign.
DIGIDESIGN, AVID and PRO TOOLS are trademarks or registered
trademarks of Digidesign and/or Avid Technology, Inc. All other
trademarks are the property of their respective owners.
All features and specifications subject to change without
notice.
PN 932707455-00 REV A 11/99
Communications & Safety Regulation Information
Compliance Statement
The model 888/24 I/O complies with the following standards
regulating interference and EMC: FCC Part 15 Class A EN55103 1,
environment E4 EN55103 2, environment E4 AS/NZS 3548 Class A CISPR
22 Class A
Radio and Television Interference
This equipment has been tested and found to comply with
thelimits for a Class A digital device, pursuant to Part 15 of
theFCC Rules.
Communications Statement
This equipment has been tested to comply with the limits for
aClass A digital device. Changes or modifications to this product
not authorized by Digidesign, Inc., could void the Certification
and negate your authority to operate the product. This product was
tested for CISPR compliance under conditions that included the use
of peripheral devices and shielded cables and connectors between
system components. Digidesign recommends the use of shielded cables
and connectors between system components to reduce the possibility
of causing interference to radios, television sets, and other
electronic devices.
Safety Statement
This equipment has been tested to comply with USA and Canadian
safety certification in accordance with the specifications of UL
Standards; UL813 and Canadian CSA standard; CSA C22.2 No.1-M90.
Digidesign Inc., has been authorized to apply the appropriate UL
& CUL mark on its compliant equipment.
Important Safety Instructions
When using electric or electronic equipment, basic
precautionsshould always be followed, including the following: Read
all instructions before using this equipment. To avoid the risk of
shock, keep this equipment away from
rain water, and other moisture. Do not use this equipment if it
is wet.
The equipment should only be connected to the correct rating
power supply as indicated on the product.
Do not attempt to service the equipment. There are no
user-serviceable parts inside. Please refer all servicing to
authorized Digidesign personnel.
Any attempt to service the equipment will expose you to a risk
of electric shock, and will void the manufacturers warranty.
The product should be connected only to the correct power supply
as indicated on the product.
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contents
Using the 888/24 I/O
. . . . . .
The 888/24 I/O Interface
.
Changing Operating Levels
Making Signal Connections
Using the 888/24 I/O Interf
Changing the Default Samp
Changing the Default Word
Muting the DAC Outputs of
Appendix A. Technical Specif
Appendix B. Calibrating the 8
About Calibration
. . . . . . .
Calibrating The 888/24 I/O
Appendix C. Calibrating the 8
About Calibration
. . . . . . .
Calibrating The 888/24 I/O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . 1
of Individual 888/24 I/O Channels . . . . . . . . . . . . . . .
. . . . . . . . . 6
to the 888/24 I/O . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . 7
ace as Stand-Alone Audio Converter . . . . . . . . . . . . . . .
. . . . . . . . 8
le Rate of the 888/24 I/O in A/D Stand-Alone Mode . . . . . . .
. . . . 9
Clock Lock Port of the 888/24 I/O in D/A Stand-Alone Mode . . .
. 10
the 888/24 I/O in A/D Stand-Alone Mode . . . . . . . . . . . . .
. . . . . 11
ications . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . 13
88/24 I/O (Pro Tools 5.0) . . . . . . . . . . . . . . . . . . .
. . . . 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . 15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . 16
88/24 I/O (Pro Tools 4.x) . . . . . . . . . . . . . . . . . . .
. . . . 19 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . 19
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . 20Contents iii
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888/24 I/O
iv
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Using the 888/24 I/O
The 888/24 I/O
is an 8-channedio interface that features 24-bdigital, and
24-bit digital-to-anverters for superior dynamic rannoise floor,
and the capability tthe full 24-bit mixing, editing, and mastering
environment of
The 888/24 I/O can be used in
u
As a 24-bit Audio Interface fo
u
As a stand-alone 24-bit audio
This Users Guide explains the and connectors on the 888/24
explains how to use it with a DPro Tools
system, or as an indestand-alone 24-bit audio convestudio.
+
If you own a Pro Tools system,information in this guide is
covere
Pro Tools TDM Hardware Installa
and the digital-to-analog converters
Using the 888/24 I/O 1
(DACs).l digital au-it analog-to-alog con-ge, reduced
o work with processing, Pro Tools.
two ways:
r Pro Tools
converter
indicators I/O. It also igidesign pendent, rter in your
most of the d in your tion Guide.
The 888/24 I/O InteThis section explains each of thtors and
indicators on the fronpanels of the 888/24 I/O Interfthey are used,
and offers suggeconnecting the 888/24 I/O to y
888/24 I/O Front PaneThe 888/24 I/O has the followipanel
indicators, moving from
1. Power
This switch applies power to thThe I position is on. The
Ooff.
2. Sync Mode
The Sync Mode LEDs indicate wple rate clock reference is
currenthe analog-to-digital converter
Front panel of the 888/24 I/Orfacee connec-
t and back ace, how stions for our studio.
lng front left to right:
e 888/24. position is
hich sam-tly used by
s (ADCs)
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888/24 I/O
2
Internal
This is the 888/24 I/O standard set-ting. In this mode, the
888/24 I/O sample rate is generated by its internal crystal
oscil-lator (whose frequency is determined by the Sample Rate
setting in the Session Setup window). Internal mode should be
active whenever the 888/24 I/Ochronized to an external clock
Digital
This setting indicates thAES/EBU or S/PDIF word clock srently
the source for the 888/24rate. This is the setting to use
fomaterial from DAT recorders ortal devices.
To use the 888/24 I/O digital inoutputs as effects sends and
retital effects devices, you should 888/24 I/O to Internal Sync
Moshould then set the digital effecaccept an external digital
clock888/24 I/O) so it synchronizes Pro Tools.
The 888/24 I/O can only synchand receive word clock lock on12 of
its digital inputs. To synyour system to an external digisource, it
must be connected toputs 12 of the 888/24 I/O. In aPro Tools
system, the system clried by the Audio Interface conthe first Pro
Tools card in your sAudio Interface will act as the mface in your
system. All other Afaces will be slaved to it.
s
Because some digital audio devices do not output proper clock
when they are not playing back, leaving the 888/24 I/O in Digital
Sync Mode may cause Pro Tools audio playback quality to suffer, or
play back at the wrong pitch. If you are using digital I/O, reset
the
is not syn-source.
at an ignal is cur- I/O sample r inputting other digi-
puts and urns to dig-set the de. You ts device to (from the
itself to
ronize to channels chronize tal clock digital in-
n expanded ock is car-nected to ystem. This aster inter-
udio Inter-
Sync Mode from Digital to Internating material.
Slave This LED is lit when the 8sample rate is synchronized to
Digidesign Audio Interface or stion peripheral. In this mode, trate
of the slave interface is derthe frequency of the incomingclock
signal present at the Slav(256x) port.
The 888/24 I/O automatically sthis mode when a Slave Clock from
another Digidesign Interfsal Slave Driver, Video Slave DrSMPTE
Slave Driver is connecte888/24 I/O Slave Clock In port
In expanded Pro Tools systemsClock output of the master Audlocks
all other interfaces togethsample accuracy, keeping all
sigsynchronous.
] When slaving to a Digidesign USlave Driver, Video Slave
Driver, oSlave Driver, set the clock sourceThe Audio Interface will
automaticSlave mode when it detects the 2clock.l after input-
88/24 I/O another ynchroniza-he sample ived from master e
Clock
witches to Out signal ace, Univer-iver, or d to the
.
, the Super io Interface er with nals phase-
niversal r SMPTE to Internal. ally switch to 56x input
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3. Sample Rate and 12 Format Indicators
These LEDs indicate the sample rate of the 888/24 I/O internal
crystal oscillator and the digital format (AES/EBU or S/PDIF) of
the audio input signal to channels 1 and 2.
The choice of digital format forchannels is made in the
Sessiondow or Hardware Setup dialog.put pairs 34, 56, and 78 of
t888/24 I/O are always AES/EBURate is set in the Session Setup
Hardware dialog in Pro Tools.
The 888/24 I/O provides the fosample rates:
48 kHz
This is a standard sampmany professional audio devicommended for
use with devicenot receive digital transfers at 4
44.1 kHz
This is the compact disampling rate and the Pro Toolsample rate.
To avoid the needrate conversion, you should uswhen you are
recording materiultimately be published on a co
s
When you are using an externasource such as a DAT recorder, thof
the 888/24 I/O indicates onlyoscillator sample rate, not that
of
digital source.
4. Level Meters
The 888/24 I/O level meters mchannel outputs of Pro Tools. Iare
monitored on-screen in thesoftware.
The 888/24 I/O is factory calibrated so that a meter reading of
18 dB corresponds to the 888/24 I/O nominal operating level (which
can be set to either +4 dBu or 10 dBV). If you sent the output to
an ana-log device with a VU meter, this would cor-
Using the
these two Setup win-
Digital in-he . Sample window or
llowing
ling rate of es. It is rec-s that can-4.1 kHz.
sc standard s default for sample e this rate al that will mpact
disc.
l digital e front panel the internal the external
onitor the nput levels Pro Tools
respond to 0 VU on the VU m
The red LED indicators on the face indicate both full-code
(hibefore clipping) and clipping ooutput signals. The on-screen
mPro Tools software indicate clipat least three consecutive
full-cofollow each other.
5. Input Level Trims
The 888/24 I/O analog inputs acalibrated at a 18 dB nominalenced
to a full code signal. Thithe nominal reference input le+4 dBu or
10 dBV), you have 1headroom before clipping. Thetrim pots allow
adjustment of t888/24 I/O input levels to matcating level of your
external equjustments can be made with a screwdriver.
6. Output Level Trims
The 888/24 I/O analog outputscalibrated at a 18 dB nominalenced
to a full code signal. Thithe nominal reference output l+4 dBu or
10 dBV), you have 1headroom before clipping. Thelevel trim pots
allow adjustmen888/24 I/O output levels to maerating level of your
external eAdjustments can be made withscrewdriver. 888/24 I/O 3
eter.
Audio Inter-ghest level f Pro Tools eters in
ping when de samples
re factory level, refer-s means at vel (either 8 dB of
input level he h the oper-ipment. Ad-Phillips
are factory level, refer-s means at evel (either 8 dB of
output t of the
tch the op-quipment. a Phillips
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888/24 I/O
4
To calibrate the input and output levels of the 888/24 I/O to
match your mixing con-sole or other devices in your studio, use
Calibration Tool (for Pro Tools 4.3.1 and earlier) or use
Calibration Mode and the Signal Generator Plug-In (for Pro Tools
5.0 or later).
+
Instructions for calibrating the
appear in Appendix B of this Guid
888/24 I/O Back Pane
The 888/24 I/O has the followipanel connectors, moving
fromright:
1. Analog Audio Outputs
These are balanced male XLR cfor analog audio output conneeight
output channels are conttive. The 888/24 I/O analog out24-bit
digital-to-analog convert
2. Analog Audio Inputs
These are balanced female XLRfor analog audio input
connect888/24 I/O analog inputs featualog-to-digital converters.
Becachannels 18 of the 888/24 I/Oware selectable in pairs
betweedigital format, analog input to
pair is disabled when digital input format is chosen for that
channel.
The 888/24 I/O analog audio connectors are balanced XLRs with
pin 2 wired hot, (or +); pin 3 cold, (or ); and pin 1 ground.
Back panel of the 888/24 I/O888/24 I/O e.
lng back left to
onnectors ctions. All inuously ac-puts feature ers.
connectors ions. The re 24-bit an-use input are soft-
n analog or a channel
3. AES/EBU Digital Outputs
The 888/24 I/O AES/EBU outpubalanced, three conductor, XLRwhich
output a 24-bit digital dOutput is continuously active oAES/EBU and
S/PDIF jacks even888/24 I/O input selector is set
4. AES/EBU Digital Inputs 1
The AES/EBU digital format is umany professional digital
audiocluding some DAT recorders. Tfaces AES/EBU input jacks are
three conductor, XLR connectocept a full 24-bit digital data st
For AES/EBU connections, 110-are highly recommended for ussional
installations. For best reslengths should not exceed 30 m
Input channels 18 of the 888/software-selectable in pairs betwor
digital format. Digital input tpair is disabled when analog inis
chosen for that channel in thSetup dialog. Input to AES/EBUnels 12
is disabled when S/PDImat is chosen for these inputs Pro Tools
Session Setup window 18
t jacks are connectors ata stream. n both the when the
to analog.
8
sed in devices, in-he Inter-balanced, rs which ac-ream.
ohm cables e in profes-ults, cable eters.
24 I/O are een analog
o a channel put format e Hardware input chan-F digital for-in
the
.
-
5. 50-pin Interface Connector
This 50-pin Computer connector is used to connect the 888/24 I/O
to a MIX card, d24 audio card, Disk I/O card, or a DSP Farm card.
The necessary cable is supplied with your Audio Interface. If you
plan to con-nect two 888/24 I/O Interfacescard or d24 card, a
16-channel cable adapter is necessary. (Thiavailable from your
Digidesign
6. S/PDIF Digital Input/Out
The Sony Phillips Digital Interf(S/PDIF) is used in many
profesconsumer CD players and DATThe 888/24 I/O S/PDIF in/out
jbalanced 2-conductor phono (Rwhich utilize a full 24-bit
digitastream. To avoid RF interferencohm coaxial cable for S/PDIF
trkeep the cable length to a maximeters.
Because input channels 12 of 888/24 I/O are software
selectabanalog or digital format, input tdigital channels is
disabled whinput is chosen or when AES/Eformat is chosen in the Pro
TooSetup window. Output is contitive on both the AES/EBU and put
jacks, regardless of which dformat is selected for channels avoid
RF interference, use 75-ocable for S/PDIF transfers and dceed a
cable length of 10 meter
7/9. Slave Clock In/Out
The Slave Clock Out jack is a standard BNC type connector that
outputs a 256 times sample rate Super Clock signal for slaving and
synchronizing multiple Digidesign In-terfaces and synchronization
peripherals
Using the
to a MIX peripheral s cable is dealer.)
put
ace Format sional and recorders. acks are un-CA) jacks l data e,
use 75-ansfers and mum of 10
the le between o these two en analog BU digital ls Session
nuously ac-S/PDIF out-igital input 12. To hm coaxial o not
ex-s.
together.
When the 888/24 I/O Sync MoInternal, connecting a valid SlaOut
signal to this port will cau888/24 I/O to automatically swimode.
When the 888/24 I/O isinterface or the first interface inDigital
sync mode overrides thClock input, and an incoming Out signal will
not switch the 8to Slave mode.
Because crucial timing data is pthese ports, you should use
hig75-ohm RG-59 cables for makintions, and keep total cable
lengthan 3 meters between interfac
8. Power Input
This connector accepts a standpower cable. The Interface is
auselecting (100V to 240V) and wically work with a standard moto
connect to AC power receptacountry. 888/24 I/O 5
de is set to ve Clock
se the tch to Slave the master a chain,
e Slave Slave Clock 88/24 I/O
assed over h-quality, g connec-
th to less es.
ard AC to power-ill automat-dular cable cles in any
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888/24 I/O
6
Changing Operating Levels of Individual 888/24 I/O Channels
The 888/24 I/O is factory set to +4 dBu op-erating levels for
input and output. How-ever, the 888/24 I/O allows youually switch
any of its analog ioutputs to either a +4 dBu or 1ating level by
moving internal its circuit board.
To change the operating level ofchannel:
1
Turn off your computer and 888/24 I/O.
2
With a Phillips screwdriver, rscrews from the top of the 888
3
Using the 1/16-inch hex wrecluded with the 888/24 I/O, camove
the front four panel screwon the bag containing the hex
4
Lift the top off of the 888/24
5
Inside the 888/24 I/O chassiseach of the channel input
trimjumper switch with a removab
cate the jumper switch for the channel you wish to modify.
Gently lift the cap off the 3-pronged connector. Place it in the
posi-tion corresponding to the operating level that you desire. For
+4 dBu levels, it should be placed over the rear two prongs.
For
The location of input and output level sthe 888/24 I/O
output leveladjustment switche+4 dBu or -10 dBV
input leveladjustment switches+4 dBu or -10 dBV
to individ-nputs or 0 dBV oper-jumpers on
an input
the
emove the /24 I/O.
nch in-refully re-
s as noted wrench.
I/O.
, next to s, there is a le cap. Lo-
10 dBV levels, it should be placfront two prongs.
6 After you have made the desirreplace the top of the 888/24
I/
7 Replace the four front panel sthe hex wrench.
8 Replace the top screws with screwdriver.
To change the operating level ofchannel:
1 Turn off your computer and 888/24 I/O.
2 Using the 1/16-inch hex wrecluded with the 888/24 I/O, camove
the front four panel screwon the bag containing the hex
3 With a Phillips screwdriver, rscrews from the top of the
888/lift the top off of the 888/24 I/O
4 To find the channel output stach the front part of the
ribbothe right side of the chassis. To dboth sides of the black
connecttly pull up.
witches inside
s
Setting the input level jumper switche
pull off jumper
place jumperin this position
to set inputto +4 dBu level
i
to
+4 -10+4 -10
+ed over the
ed changes, O.
crews using
a Phillips
an output
the
nch in-refully re-
s as noted wrench.
emove the 24 I/O and .
witches, de-n cable at o this, grip or and gen-
s
place jumpern this positionto set input -10 dBV level
4 -10
-
5
With the ribbon cable out of the way youll see eight 3-pronged
jumper switches, each with a removable cap. Locate the switch for
the channel you wish to modify.
6
Gently lift the cap off of the switch. Place it in the position
ing to the operating level that For +4 dBu levels, it should be the
left two prongs. For 10 dBshould be placed over the right
7
After you have made the desirreconnect the ribbon cable andback
on the 888/24 I/O.
8
Replace the four front panel sthe hex wrench.
9
Replace the top screws with screwdriver.
Making Signal Connections to the 888/24 I/O
Depending on how you plan to use the 888/24 I/O, the way you
connect it to your studio will vary.
Setting the output level jumper switch
detacribbon c
remove jumper
+4 -10
place jumperin this positionto set output
to +4 dBu level
place jumperin this positionto set output
to -10 dBV levelUsing the
jumper correspond-you desire. placed over V levels, it two
prongs.
ed changes, put the top
crews using
a Phillips
Choosing between +4 d10 dBV operation modThe 888/24 I/O can be
set to op+4 dBu or 10 dBV input and ouIt is important that you
determline level mode is appropriate fdio. In +4 dBu operating
mode888/24 I/O is a 24-bit digital aucapable of producing audio
signear +26 dBu.
Check the owners manual for power amplifier or effects proceit
can handle this load. If it cansider setting the 888/24 I/O to 10
dBV line levels.
Consider the following when comixer:
u If your mixer cannot handle1.5V (RMS) inputs at +4 dBu,
thshould set the 888/24 I/O to runline level.
u If your mixer can handle up (RMS) inputs, or has pads or
attits inputs, then you can use theting on the 888/24 I/O.
Most manuals contain device incations, including whether or
npads or attenuators. Consult thturer of your mixer or power
amfurther information.
es
hable 888/24 I/O 7
Bu and eserate at tput levels. ine which or your stu-, the dio
device
nals at or
your mixer, ssor to see if not, con-
operate at
nnecting a
more than en you at 10 dBV
to 8.5V enuators on +4 dBu set-
put specifi-ot there are e manufac-plifier for
-
888/24 I/O
8
Setting Up Your Studio
The following diagram illustrates a typical studio setup, with
the 888/24 I/O con-nected to a mixing console, effects and other
equipment.
The 888/24 I/O analog audio care balanced XLRs with pin 2 w(or
+), pin 3 cold (or ), anground.
If you are connecting a balancepin 1 and shield should be conthe
input only (not at the outpuprevent ground loops betweenand pin 1
conductor.
If you are connecting an unbalato the 888/24 I/O inputs or
outnect only pin 2 to the + sign1 and 3 to ground at all inputs
Using the 888/24 I/O Interface as Stand-Alone Audio
Converter
The 888/24 I/O can be used apart from Pro Tools as a stand-alone
8-channel, 24-
A typical studio configuration
Poweand Sp
Digital Inputs/OutputsChannel 1-2
To DAT Recorder
Digital Inputs/Channel
To Digital Effec
InstrumentsConnected to Console
AnalogAudio
Inputs 5-8
AnalogAudio
Outputs 5-8
Effects Device
D
ChannelOutputs 1-4
Tape Returnsor Inputs 1-4
Computer 1
ANALOG OUT
PUT
ANALOG INPU
T
AES/EBU OU
TPUTAES/E
BU INPUT
S/PDIF
IN
S/PDIF
OUT
SLAVE CLOC
K
IN
SLAVE CLOC
K
OUT
7
8
5
6
3
4
1
2
7
8
5
6
3
4
1
2
5/6
7/8
1/2
3/4
5/6
7/8
1/2
3/4onnectors ired hot
d pin 1
d system, nected at t). This will
the shield
nced signal puts, con-
al, and pins only.
bit, analog-to-digital or digital-converter.
Before you use the 888/24 I/O alone mode:
1 Turn off the 888/24 I/O.
2 Do not turn on your comput888/24 I/O is in stand-alone mdo,
the 888/24 I/O will stop funstand-alone mode.
To use the 888/24 I/O as a stanconverter:
1 Turn off any digital devices tsend a word clock signal to
thechannel 12 digital input ports
2 Turn on the 888/24 I/O. Thesearches briefly for a word
clocchannels 12 of its digital inpu
3 If the 888/24 I/O does not declock, it functions as a
stand-alconverter using its internal clomode you will use analog
inpuAES/EBU outputs 18.
] The default sample rate of the in stand alone A/D mode is
44.1change this default setting to 48 must open the 888/24 I/O and
mset it by moving an internal jumperChanging the Default Sample
Ra888/24 I/O in A/D Stand-Alone Mpage 9.
r Ampeakers
Outputs3-4ts Devices
DAT Recorder
s
igital Effects Devices(set to external sync)to-analog
in stand-
er while the ode. If you ctioning in
d alone A/D
hat may 888/24 I/O .
888/24 I/O k signal on t ports.
tect word one A/D ck. In this ts 18 and
888/24 I/O kHz.To kHz, you anually re-
switch. See te of the ode on
-
To use the 888/24 I/O as a stand alone D/A converter:
1
Make sure that a digital device providing a word clock signal is
connected to AES/EBU inputs 12 of the 888/24 I/O and turned on.
2
Turn on the 888/24 I/O. Thewill search for a valid word
clocclock signal on channels 12 oinput ports.
3
When a valid word clock locnized, the 888/24 I/O will entesync
mode and function as a stD/A converter using AES/EBU iand analog
outputs 18.
The 888/24 I/O D/A sample ratmined by the sample rate it
dechannels 12 of its AES/EBU in
]
The 888/24 I/O defaults to lisdigital word clock signal on
channeAES/EBU digital input ports. To udevice as your source of
word clocreset this default by opening the and moving an internal
jumper swChanging the Default Word Clockthe 888/24 I/O in D/A
Stand-Alon
page 10.
To return the 888/24 I/O to Pro operation:
u
Turn on your computer. or
u
If your computer is on, launc
Changing the Default Sample Rate of the 888/24 I/O in A/D
Stand-Alone Mode
Using the
888/24 I/O k or a word f its digital
k is recog-r digital and-alone nputs 18
e is deter-tects on puts.
tening to a ls 12 of its
se a S/PDIF k, you must
888/24 I/O itch. See Lock Port of e Mode on
Tools-based
h Pro Tools.
The default sample rate of the in stand alone A/D mode is
44.1wish to change this default sett48 kHz, you must open the
888manually reset it by moving anjumper switch.
To change the default sample ra888/24 I/O in stand alone A/D
1 Make sure that your comput888/24 I/O are turned off.
2 With a Phillips screwdriver, rscrews from the top of the
888
3 Using the 1/16 inch hex wrecluded with the 888/24 I/O, camove
the front four panel screwon the bag containing the hex
4 Lift the top off of the 888/24
5 Inside the left-front of 888/2sis, near the large FPGA chip,
isthree jumper switches, each wiable cap. Each of these
switchedifferent default function whicin Figure 1 and 2.
6 Locate the jumper switch forthat you wish to modify and gecap
off the 3-pronged connecto
7 Place it in the position corresthe value that you desire. For
a fault sample rate, it should be pthe right two prongs. For a 48
ksample rate, it should be placedleft two prongs. Refer to
Figuredetails. 888/24 I/O 9
888/24 I/O kHz. If you ing to /24 I/O and internal
te of the mode:
er and
emove the /24 I/O.
nch in-refully re-
s as noted wrench.
I/O.
4 I/Os chas- a set of th a remov-s controls a h is shown
the default ntly lift the r.
ponding to 44.1 kHz de-laced over Hz default over the
1 and 2 for
-
888/24 I/O
10
8
After you have made the desired changes, replace the top of the
888/24 I/O.
9
Replace the four front panel screws using the hex wrench.
10
Replace the top screws with a Phillips screwdriver.
Changing the Default Word Clock Lock Port of the 888/24 I/O in
D/A Stand-Alone Mode
Figure 1. jumper switch location in th
Figure 2. Changing jumper switch se
stand alone modedefault word clock lock switches
AES/EBU or S/PDIF
stand alone modedefault sample rate switches
44.1 kHz or 48 kHz
stand alone modeDAC muting switches
in this positionDACs are muted
in this pos44.1 kHz
44.1 kHz48 kHz
unmute DACs
mute DACs
AES/EBUS/PDIF
remove jumper andplace it in desired positionThe 888/24 I/O
defaults to listdigital word clock signal on chaits AES/EBU digital
input ports.to use a S/PDIF device as your sword clock, you must
reset thisopening the 888/24 I/O and mternal jumper switch so that
chof its S/PDIF digital input portsstead.
+ Refer to Figure 1 and 2 for detaswitches and their default
positio
To change the default word clockthe 888/24 I/O in stand alone
D
1 Make sure that your comput888/24 I/O are turned off.
2 With a Phillips screwdriver, rscrews from the top of the
888
3 Using the 1/16 inch hex wrecluded with the 888/24 I/O, camove
the front four panel screwon the bag containing the hex
4 Lift the top off of the 888/24
5 Inside the left-front of 888/2sis, near the large FPGA chip,
isthree jumper switches, each wiable cap. Each of these
switchedifferent default function whicin Figure 1 and 2.
6 Locate the jumper switch forclock lock default (the back-moand
gently lift the cap off the 3connector.
e 888/24 I/O
ttings
itionis selectedening to a nnels 1-2 of If you wish ource of
default by oving an in-annels 1-2 are used in-
ils on jumper ns.
lock port of /A mode:
er and
emove the /24 I/O.
nch in-refully re-
s as noted wrench.
I/O.
4 I/Os chas- a set of th a remov-s controls a h is shown
the word st jumper) -pronged
-
7 Place it in the position corresponding to the value that you
desire. For an AES/EBU word clock lock port, it should be placed
over the right two prongs. For a S/PDIF word clock lock port, it
should be placed over the left two prongs. Refer to Figure 1 and 2
for details.
8 After you have made the desirreplace the top of the 888/24
I/
9 Replace the four front panel sthe hex wrench.
10 Replace the top screws withscrewdriver.
Muting the DAC Outthe 888/24 I/O in AStand-Alone ModeIn certain
cases, you may wish 888/24 I/Os D/A converters whstand-alone mode.
This is usefuample, you need to eliminate pternal analog feedback
through
To do this, you must open the and move an internal jumper sthat
the DACs are muted durinalone operation.
+ Refer to Figure 1 and 2 for detaswitches and their default
positio
To change the DAC output mute s888/24 I/O in stand-alone D/A
1 Make sure that your comput888/24 I/O are turned off.
2 With a Phillips screwdriver, rscrews from the top of the
888
3 Using the 1/16 inch hex wrench in-cluded with the 888/24 I/O,
carefully re-move the front four panel screws as noted on the bag
containing the hex wrench.
4 Lift the top off of the 888/24 I/O.
5 Inside the left-front of 888/24 I/Os chas-Using the
ed changes, O.
crews using
a Phillips
puts of /D
to mute the en in A/D l if, for ex-otential ex- a console.
888/24 I/O witch so g stand-
ils on jumper ns.
etting of the mode:
er and
emove the /24 I/O.
sis, near the large FPGA chip, isthree jumper switches, each
wiable cap. Each of these switchedifferent default function as
shure 1 and 2.
6 Locate the jumper switch formuting default (the middle
jumgently lift the cap off the 3-pronector.
7 Place it in the position corresthe value that you desire. To
mDACs, it should be placed over prongs. To unmute the DACs
(aoperation), it should be placedright two prongs. Refer to
Figuredetails.
8 After you have made the desirreplace the top of the 888/24
I/
9 Replace the four front panel sthe hex wrench.
10 Replace the top screws withscrewdriver. 888/24 I/O 11
a set of th a remov-s controls a own in Fig-
the DAC per) and
nged con-
ponding to ute the the left two s in normal over the 1 and 2
for
ed changes, O.
crews using
a Phillips
-
888/24 I/O12
-
appendix a
Technical Speci
General
Analog Inputs/Outputs:
n Actively balanced XLR conneoutputs internally switchable b+4
dBu and 10 dBV line levels
Analog Level Trimming:
n Accessible from front panel
Digital I/O AES/EBU:
n 8 channel; balanced XLR con
Digital I/O S/PDIF:
n 2 channel; coaxial RCA conn
Sample Rate:
44.1 kHz or 48 kHz, 10ppm
Clock Reference:
n Super Clock (256x) sample clBNC connectors; additional
cloences supported via DigidesignSlave Driver, SMPTE Slave
DrivSlave Driver and other optionanizers
Nominal Operating Level:
n +4dBu; factory calibrated at headroomAppendix A: Technical
Specifications 13fications
ctors, etween
nectors
ectors
ock In/Out; ck refer-'s Universal er, Video l synchro-
18dB
A/D Specifications
SNR (signal-to-noise ratio):
n 113 dB (balanced, A-weigh
n 110 dB (unweighted)
THD:
n 0.003% 0.01 dB @ 1kHz; 20(band-limited)
Maximum Input Level:
n +26dB
Frequency Response:
n 1 dB, 20 Hz20 kHz
Clock jitter:
n < 40pS RMS 22Hz-22kHz BWted)
Hz-20 kHz
-
888/24 I/O14
D/A Specifications
SNR (signal-to-noise ratio):
n 110 dB (balanced, A-weighted)
n 107 dB (unweighted)
THD:
n 0.003% 0.01dB @ 1kHz; 20 (band-limited)
Maximum Output Level:
n +26 dB/channel (bridging loa
Frequency Response:
n 1dB, 20 Hz20 kHz
Physical Specifications
Power requirements:
n 90260 VAC, 47 63 Hz; 30 VAauto-switching
Weight:
n 7.6 lbs (4.1 kg)
Dimensions:
n 2U external rackmount devic19" x 3.5" x 9.75" (48.26 cm x 8.89
cm x 24.77 cmHz- 20 kHz
ds)
;
e
)
-
appendix b
Calibrating the
Before you use the 888/24/I/O face, you may want to calibrateand
output levels to the level oing console.
The 888/24 I/O is factory-calibrits input operating level is set
tnominal with 18 dB headroomfull code, unity gain, making
cunnecessary for most professiotions.
If you do need to recalibrate yoor other components of your scan
use the alignment procedurhere.
About CalibrationCalibrating levels on a digital revice is
different from calibratinan analog recording device. Undevices,
most digital devices dostandard 0 VU level setting tsponds to
nominal input and ouInstead, with an interface such888/24 I/O, the
meters are calibdecibels below peak (digital clippAppendix B:
Calibrating the 888/24 I/O (Pro Tools 5.0) 15888/24 I/O (Pro Tools
5
Audio Inter- its input f your mix-
ated so that o +4 dB nominal at alibration nal applica-
ur interface tudio, you e described
cording de-g levels on like analog not have a hat corre-tput
levels.
as the rated in ing) level.
HeadroomThe concept of headroom is slient for analog and digital
devic
Analog Most analog devices allotain amount of headroom abovyou
send a signal above the 0 Van analog recorder, you still haof
headroom, and if tape saturait does so fairly gracefully, givina
compressed sound that someable.
Digital Digital devices, on the odo not allow for signals that
exnamic range of the input. Wheexceeds the maximum input leital
device, clipping occurs, caudistortion, which is harsh and
desirable.
The 888/24 I/O provides an inddard headroom of 18 dB. The eyou
use will be determined by tof headroom available in the resystem.
For example, if your msole has 15 dB of headroom abolevel, then you
may want to ca888/24 I/O to have 15 dB of he.0)
ghtly differ-es.
w for a cer-e 0 VU. If U level to
ve a margin tion occurs, g the audio find desir-
ther hand, ceed the dy-n a signal vel for a dig-sing digital
usually un-
ustry stan-xact value he amount st of your ixing con-ve nominal
librate the adroom.
-
888/24 I/O16
The Calibration ProcessAnalog To calibrate the input level of an
an-alog device to a mixing consoles output level, you would
typically send a 1 kHz tone at 0 VU from the console to the ana-log
deck and align the recording decks meters to read 0 VU.
Digital With a digital recording as the 888/24 I/O, however, in
low for headroom, you must altone from the console to a valuzero on
the 888/24 I/O, by exaamount of headroom that you
For example, to have 12 dB of habove 0 VU with the 888/24
I/Oalign the incoming 0 VU 1kHzlevel of 12 dB. For 18 dB of heyou
would align it to 18 dB. (Ssumed that you are using the 8with a +4
dBu console, a 0 VU coming out of the console is actalent to a
nominal +4 dBu leve
Calibrating The 888/If you are using Pro Tools 5.0 ocan put Pro
Tools software in aerating mode called calibration use the Signal
Generator Plug-Iate a test tone for calibration o888/24 I/O.
If you are using Pro Tools 4.3.1refer to Appendix C: Calibrating
888/24 I/O (Pro Tools 4.x) for castructions.
The Pro Tools Installer includesconfigured calibration session
tthat cover most common calib
ups. You can use these in addition to the calibration procedure
given below.
s Turn down your monitoring system before beginning calibration.
The Signal Generator Plug-In emits a continuous signal when
in-serted on a track.device such order to al-ign a 0 VU e less
than
ctly the want.
eadroom , you must
tone to a adroom, ince it is as-88/24 I/O signal level ually
equiv-l signal.)
24 I/O r later, you special op-mode, then n to gener-f the
or earlier, the libration in-
several pre-emplates ration set-
] During calibration, set all Pro Tfaders to their default of 0
dB by clicking (Macintosh) or Alt-Shift-cldows) on any fader in the
session
To calibrate the 888/24 I/0:
1 In Pro Tools, choose Setups >and click Operation.
2 Under Output Options, selectputs.
3 At the bottom of the Operatiences dialog, enter a
CalibratioLevel value (a level of 18 dB is
4 Click Done.
5 Create a new audio track andSignal Generator Plug-In on th
6 Set Signal Generators outputshould be the same value you ethe
Calibration Reference Leve
7 Set Signal Generators freque1000 Hz.
8 Set Signal Generators signal wSine.
9 Route the tracks output to B
10 Create a mono auxiliary inpeach 888/24 I/O output you
wabrate. Set the output assignmenthese auxiliary inputs to its
res888/24 I/O output.
11 Set the input of each auxiliatrack to Bus 1.ools track
Option-Shift-icking (Win-.
Preferences
Direct Out-
on Prefer-n Reference typical).
insert the e track.
level. This ntered as
l in step 3.
ncy to
aveform to
us 1.
ut track for nt to cali-t for each of pective
ry input
-
12 Create an additional mono auxiliary in-put track for each
888/24 I/O input you want to calibrate. Set the input assignment
for each of these auxiliary inputs to its re-spective 888/24 I/O
input. Then set the output of each of these auxiliary inputs to an
unused bus pair (for exampleso that feedback doesnt occur itoring
main outputs 12.
13 Connect an external VU meof the 888/24 I/O outputs in turtime
as you calibrate.)
14 Adjust the 888/24 I/O outpupots with a Phillips
screwdriveroutputs to read 0 VU on the emeter.
15 Connect each output of thedirectly to its input: Connect
coutput to channel 1 input, andeach channel.
16 In Pro Tools, choose Operatbration Mode.
The names of all uncalibrated tto flash. In addition, the track
vcator of each auxiliary input traan external input signal now
dreference level coming from thoutput.
17 Adjust the 888/24 I/O inpupots with a Phillips
screwdriverinputs to match the reference lthe level is properly
matched, tname will stop flashing.
The Automatch indicator arrows on each track show the direction
of adjustment re-quired for alignment:
u When the incoming level is higher than the reference level,
the down arrow will ap-pear lit (blue). In this case, trim the
Appendix B: Calibrating the 888/24 I/O (P
bus 3132) when mon-
ter to each n. (One at a
t level trim to align the xternal VU
888/24 I/O hannel 1 so on for
ions > Cali-
racks begin olume indi-ck receiving isplays the e calibrated
t level trim to align the evel. When he track
888/24 I/O input level down.
u When the incoming level is the reference level the up arrowlit
(red). In this case, trim the 8input level up.
When you have properly aligncoming peak signal levels to
mibration reference level, both Aindicator arrows will light: the
uand the down arrow blue.
18 When you have finished, chations > Calibration Mode
againCalibration Mode.
Calibrating a System W888/24 I/O and 882/20Audio InterfacesThe
888/24 I/O is factory presetof headroom in its +4 dB line ling
mode. The 882/20 I/O, howfixed at 14 dB of headroom andare not
adjustable.
When setting up an 882/20 I/Olarly in systems using a
combin882/20 I/O and 888/24 I/O), mthat you use a headroom
settinfor your system. This helps enscorded audio files have the
samlevels regardless of which interfrecorded with.ro Tools 5.0)
17
lower than will appear 88/24 I/O
ed the in-atch the cal-utomatch p arrow red
oose Oper- to deselect
ith Both I/O
with 18 dB evel operat-ever, is its inputs
(particu-ation of the ake sure g of 14 dB ure that re-e
relative
ace they are
-
888/24 I/O18
-
appendix c
Calibrating the
Before you use the 888/24/I/O face, you may want to calibrateand
output levels to the level oing console.
The 888/24 I/O is factory-calibrits input operating level is set
tnominal with 18 dB headroomfull code, unity gain, making
cunnecessary for most professiotions.
If you do need to recalibrate yoor other components of your scan
use the alignment procedurhere.
About CalibrationCalibrating levels on a digital revice is
different from calibratinan analog recording device. Undevices,
most digital devices dostandard 0 VU level setting tsponds to
nominal input and ouInstead, with an interface such888/24 I/O, the
meters are calibdecibels below peak (digital clippAppendix C:
Calibrating the 888/24 I/O (Pro Tools 4.x) 19888/24 I/O (Pro Tools
4
Audio Inter- its input f your mix-
ated so that o +4 dB nominal at alibration nal applica-
ur interface tudio, you e described
cording de-g levels on like analog not have a hat corre-tput
levels.
as the rated in ing) level.
HeadroomThe concept of headroom is slient for analog and digital
devic
Analog Most analog devices allotain amount of headroom abovyou
send a signal above the 0 Van analog recorder, you still haof
headroom, and if tape saturait does so fairly gracefully, givina
compressed sound that someable.
Digital Digital devices, on the odo not allow for signals that
exnamic range of the input. Wheexceeds the maximum input leital
device, clipping occurs, caudistortion, which is harsh and
desirable.
The 888/24 I/O provides an inddard headroom of 18 dB. The eyou
use will be determined by tof headroom available in the resystem.
For example, if your msole has 15 dB of headroom abolevel, then you
may want to ca888/24 I/O to have 15 dB of he.x)
ghtly differ-es.
w for a cer-e 0 VU. If U level to
ve a margin tion occurs, g the audio find desir-
ther hand, ceed the dy-n a signal vel for a dig-sing digital
usually un-
ustry stan-xact value he amount st of your ixing con-ve nominal
librate the adroom.
-
888/24 I/O20
The Calibration ProcessAnalog To calibrate the input level of an
an-alog device to a mixing consoles output level, you would
typically send a 1 kHz tone at 0 VU from the console to the ana-log
deck and align the recording decks meters to read 0 VU.
Digital With a digital recording as the 888/24 I/O, however, in
low for headroom, you must altone from the console to a valuzero on
the 888/24 I/O, by exaamount of headroom that you
For example, to have 12 dB of habove 0 VU with the 888/24
I/Oalign the incoming 0 VU 1kHzlevel of 12 dB. For 18 dB of heyou
would align it to 18 dB. (Ssumed that you are using the 8with a +4
dBu console, a 0 VU coming out of the console is actalent to a
nominal +4 dBu leve
Calibrating The 888/If you are using Pro Tools 4.3.1you can use
the Calibration Totion (available on your Pro TooCD-ROM) to
calibrate the outpputs of the 888/24 I//O.
If you are using Pro Tools 5.0 oto Appendix B: Calibrating the
88(Pro Tools 5.0) for calibration indevice such order to al-ign a 0
VU e less than
ctly the want.
eadroom , you must
tone to a adroom, ince it is as-88/24 I/O signal level ually
equiv-l signal.)
24 I/O or earlier, ol applica-ls Installer uts and in-
r later, refer 8/24 I/O structions.
The Calibration Tool software
The Calibration Tool has the focontrols:
Channel Use this pop-up to selechannel for the input level
read
Input Level Use this as a graphicmerical display of the dB level
the headroom you have specifiparticular interface. (In other
wamount of dB below digital clipamount of analog headroom yuse in
your system.)
Signal Present This indicates w60 dB signal relative to the
hepresent at the input.
Headroom Use this field to enterof headroom between your 0 dthe
888/24 I/O full scale digitalvalues above the full scale
digitacause digital clipping.
Oscillator Use this to turn the aform generator on or off.
Frequency Click on this pop-upthe output frequency of the auform
generator. You can choos1 kHz, or 10 kHz signal.llowing
ct the input ings.
and nu-relative to ed on that ords, the ping, or the ou wish
to
hen a adroom is
an amount B level and value. Any l value will
udio wave-
to select dio wave-e a 100 Hz,
-
Level Use this to select the output level rel-ative to the
Headroom for the audio wave-form generator.
Wave Type Use this to select the type of au-dio waveform
generated the waveform generator.
Output Every Channel If this optlected and the Oscillator is
on,put will generate an audio waveat the selected frequency. If
thinot selected and the Oscillatorthe selected output Channel wthe
audio waveform signal. If this off, this option has no effect
Hardware Setup Use this to choDigidesign audio interface andwish
to adjust using Calibratio
In order to align your system wware, you must have one of th
u A device (such as sine wave ogenerator) that can send a 1
kHwaveform wave into the 888/20 VU.
or
u A device (such as a mixing coaccurate VU meters) that can
mlevel of a 1kHz audio waveformby the 888/24 I/O.
Using an External ToneGeneratorIf you have a sine wave
generatproduce a 0 VU 1 kHz tone, useing calibration procedure:
To calibrate the 888/24 I/O withTool using an external
source:
1 Start the Calibration Tool ap
2 In the Headroom field, enter the amount of headroom you
desire. The default setting for the 888/24 I/O is 18 dB.
3 Send a 1kHz tone into the 888/24 I/O from your external
source.
4 In the software, select 888/24 I/O 1 Appendix C: Calibrating
the 888/24 I/O (P
ion is se- every out-form signal s option is is on, only ill
generate e Oscillator .
ose which card you n Tool.
ith this soft-e following:
r test tone z audio
4 I/O at
nsole with easure the produced
or that can the follow-
Calibration
plication.
Channel 1 from the Channel pmenu. You should get some levscreen
level meter.
5 Adjust the 888/24 I/O ChannLevel trim pot by inserting a
scinto the Input Level trim pot anuntil the Calibration Tools
on-meter reaches 0 VU and the nuout says 0.0 dB. The input is
no
6 Repeat this procedure for eac888/24 I/O input by selecting
tthe Channel pop-up menu andthe appropriate front panel Inptrim pot
on the 888/24 I/O.
7 When you have finished aligputs, connect each output of
th888/24 I/O directly to its inputChannel 1 output to Channel 1so
on.
8 Select 1kHz from the oscillatquency pop-up menu, and turntor
on by clicking On.
9 Choose 888/24 I/O 1 Channthe Channel pop-up. Adjust thLevel
trim pots by inserting thescrewdriver into the pot and tutil the
on-screen meter reachesthe numeric readout says 0.0 d
10 Repeat this procedure for eacterface output.ro Tools 4.x)
21
op-up el in the on-
el 1 Input rewdriver d turning it screen meric read-w
aligned.
h hem from adjusting ut Level
ning the in-e
: Connect input, and
or Fre- the oscilla-
el 1 from e Output Phillips rning it un- 0 VU and B.
h Audio In-
-
888/24 I/O22
Using a VU meter If you don't have a sine wave generator or
another way to send a 1 kHz tone into the 888/24 I/O at 0 VU, a
second alternative is to measure the output level of the 888/24 I/O
with a VU meter, such as the kind found on a professional-qing
console. To do this, be sureoutputs of the 888/24 I/O are cothe VU
meters of the console ovice. (On most consoles these iusually the
tape returns, or posline inputs.)
To calibrate the 888/24 I/O withTool using an external VU
meter
1 In the Calibration Tool softwkHz from the Frequency
pop-upclick the oscillator setting to O
2 Adjust the 888/24 I/O Outpupots with a Phillips
screwdriveroutputs to read 0 VU on youmeters.
3 After you have done this, cooutput of the 888/24 I/O
directput: Connect Channel 1 OutpuChannel 1 Input, and so on
fornel.
4 To align the inputs, select 88Channel 1 from the Channel
pmenu. Adjust the 888/24 I/O Intrim pot with the screwdriver
uscreen meter reaches 0 VU. Tnow aligned.
5 Repeat this procedure for eacuality mix- that the nnected
to
r other de-nputs are sibly the
Calibration :
are, select 1 menu and
n.
t Level trim to align the r console's
nnect each ly to its in-t to each chan-
8/24 I/O 1 op-up put Level ntil the on-his input is
h input.
Using the 888/24 I/OThe 888/24I/O Interface888/24I/O Front
Panel1. Power2. Sync Mode3. Sample Rate and 12 Format Indicators4.
Level Meters5. Input Level Trims6. Output Level Trims
888/24I/O Back Panel1. Analog Audio Outputs2. Analog Audio
Inputs3. AES/EBU Digital Outputs 184. AES/EBU Digital Inputs 185.
50-pin Interface Connector6. S/PDIF Digital Input/Output7/9. Slave
Clock In/Out8. Power Input
Changing Operating Levels of Individual 888/24I/O ChannelsMaking
Signal Connections to the 888/24I/OChoosing between +4dBu and 10dBV
operation modesSetting Up Your Studio
Using the 888/24I/O Interface as Stand-Alone Audio
ConverterChanging the Default Sample Rate of the 888/24I/O in A/D
Stand- Alone ModeChanging the Default Word Clock Lock Port of the
888/24I/O in D/A Stand- Alone ModeMuting the DAC Outputs of the
888/24I/O in A/D Stand-Alone Mode
Technical SpecificationsGeneralA/D SpecificationsD/A
SpecificationsPhysical Specifications
Calibrating the 888/24I/O (ProTools 5.0)About
CalibrationHeadroomThe Calibration Process
Calibrating The 888/24I/OCalibrating a System With Both
888/24I/O and 882/20I/O Audio Interfaces
Calibrating the 888/24I/O (ProTools 4.x)About
CalibrationHeadroomThe Calibration Process
Calibrating The 888/24I/OUsing an External Tone GeneratorUsing a
VU meter