Akai DR 4 User manual

AKAI DR4
Hard Disk Recorder
Owner's Manual
(Software Version 1,0)
<#•: To show our support for the protection of the earth's environment,
m9this manual has been printed entirely on recycled paper.

WARNING!!
To prevent fire or shock hazard, do no? expose this appliance to
rain or moisture.
I-En
CAUTION :TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
THE SYMBOLS ARE RULED BY UL STANDARDS (U.S.A)
\
The lightning flash with the arrowhead symbol superimposed
across agraphical representation of aperson, within an equilateral
triangle, is intended to alert the user to the presence of uninsulated
"dangerous voltage" within the product's enclosure; that may be of
sufficient magnitude to constitute arisk of electric shock.
The exclamation point within an equilateral triangle is intented to
alert the user to the presence of important operating and mainte-
nance (servicing) Instructions in the literature accompanying the
appliance.
5A-En

WARNING
Power requirements for^electrloaiequiptmnt vary from area to area. Please ensure that
.your PR4 meets the power requirements irv your area. If in doubt, consult aqualified
electrician or Akai Professional dealer.
120VAC @60Hz for USA and Canada
220-230VAC @50Hz for Europe (excluding UK)
240VAC @50Hz for UK and Australia
PROTECTING YOURSELF AND THE DR4
Never touch the AC plug with wet hands.
Always disconnect the DR4 from the power supply by pulling on the plug, not the
cord.
Allow only an Akai Professional dealer or qualified professional engineer to repair
or reassemble the DR4. Apart from voiding the warranty, unauthorized engineers
might touch live internal parts and receive aserious electric shock.
Do not put, or allow anyone to put any object, especially metal objects, into the DR4.
Use only ahousehold AC power supply. Never use aDC power supply.
If water or any other liquid is spilled into or onto the DR4, disconnect the power, and
call your dealer.
Make sure that the unit is well-ventilated, and away from direct sunlight.
To avoid damage to internal circuitry, as well as the external finish, keep the DR4
away from sources of direct heat (stoves, radiators, etc.).
Avoid using aerosol insecticides, etc. near the DR4. They may damage the surface,
and may ignite.
Do not use denaturated alcohol, thinner or similar chemicals to clean the DR4. They
will damage the finish.
Modification of this equipment is dangerous, and can result in the functions of the
DR4 being impaired. Never attempt to modify the equipment in any way.
In order to assure optimum performance of your DR4, select the setup location
carefully, and make sure the equipment is used properly. Avoid setting up the DR4
in the following locations:
1. In ahumid or dusty environment
2. In aroom with poor ventilation
3. On asurface which is not horizontal
4. Inside avehicle such as a car, where it will be subject to vibration
5. In an extremely hot or cold environment

Precautions When Using the Optional Internal HD240 Hard Disk Drive
1.The hard disk drive has extremely high precision and is vulnerable to shock and
vibration. If transporting the DR4 by either land or air, we recommend packing it in a
shell-shaped case lined with urethane rubber which meets ATA specifications.
2. Make sure the DR4 is used in the horizontal position. Do not set it on end or tilt it when
using it. \vv,rvv
3. If the DR4 is moved from acold location to awarm one, or if the temperature has been
raised suddenly, condensation may form inside the DR4. If it is impossible to avoid
conditions like these, let the DR4 sit for at least an hour in the new location before using
it.
4. When setting up the DR4, make sure the ventilation opening is not blocked. Also, if
using the DR4 in arack that contains other equipment, make sure sufficient ventilation
space is assured on all sides (approx. 44 mm of space between the DR4 and any
equipment mounted above or below it in the rack).

FOR CUSTOMERS IN THE UK
IMPORTANT FOR YOUR SAFETY
The flex supplied with your machine will have three wires, as shown in the illustration.
Green/Yellow
(Earth)
Blue
(Neutral)
WARNING; THIS APPLIANCE MUST BE EARTHED***
IMPORTANT
The wires in this mains lead are coloured in accordance with the following code:
Green -and -yellow :Earth
Blue :Neutral
Brown :Live
As the colours of the wires in the mains lead of this apparatus may not correspond with
the coloured markings identifying the terminals in your plug, proceed as follows: The wire
which is coloured green-and-yellow must be connected to the terminal in the plug which
is marked by the letter Eor by the safely earth symbol -±r or coloured green or coloured
green- and-yellow.
The wire which is coloured blue must be connected to the terminal which is marked with
the letter Nor coloured black.
The wire which is coloured brown must be connected to the terminal which is marked with
the letter Lor coloured red.

FCC WARNING
This equipment has been tested and found to comply with the limits for aClass Bdigital
device: pursuant to Part t5 of the FCC rules. These limits are designed to provide
reasonable protection against harmful interference in aresidential installation. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can bje dj^rmined by turning the equipment off and on, the
user is encouraged to correct the inter^rejrjjpeby one or more of the following measures:
-Reorientate or relocate the receiyirf| Antenna.
-Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on acircuit different from that to which the
receiver is connected.
-Consult the dealer or an experienced radio/TV technician for help. 2iB-En
AVIS POUR LES ACHETEURS CANADIENS DU DR4
Le present appareil numerique n'ement pas des bruits radioelectriques depassant les
limites applicables aux appareils numeriques de la Class Bprescrites dans le Reglement
sur le brouillage radioelectrique edicte par le ministere des Communications du Canada
27-F i
This digital apparatus does not exceed the Class Blimits for radio noise emissions from
digital apparatus set out in the Radio Interference Regulations of the Canadian
Department of Communications. 27-En
——--
—- ,1, ,.
FOR KUNDEN IN DER BUNOESREPUBLIK DEUTSCHLAND
Bescheinigung von AKAI
Hiermit wird bescheinigt, daB das Gerat AKAI
DR4
in Obereinstimmung mit den Bestimmungen der
Amtsblattverfugung 1046/1984
funkentstort ist,
Der Deutschen Bundespostwurde das Inverkehrbringen dieses Cerates angezeigt und
die Berichtigung zur Uberprufung der Serie auf Einhaitung der Bestimmungen eingeraumt.
AKAI ELECTRIC CO., LTD 17B-G
COPYRIGHT NOTICE
The AKAI DR4 is acomputer-based device, and as such contains and uses software in
ROMs. This software, and all related documentation, including this Owner's Manual,
contain proprietary information which is protected by copyright laws. All rights are reserved.
No part of the software or its documentation may be copied, transferred or modified. You
may not modify, adapt, translate, lease, distribute, resell for profit or create derivative works
based on the software and its related documentation or any part there of without prior written
consent from AKAI Electric Co. Ltd, Tokyo, Japan.

WARRANTY
AKAI Electric Co. Ltd warrants its products, when purchased from an authorized AKAI dealer, to be
free from defects in materials and workmanship for aperiod of 12 (twelve) months from the date of
purchase. Warranty service is effective and available fo the original purchaser only, and only on
completion and return of the AKAI Warranty Registration Card within 14 days of purchase.
Warranty coverage is valid for factory-authorized updates to AKAI instruments and their software,
when their installation is performed by an authorized AKAI Service Centre, and aproperly completed
Warranty Registration has been returned to your Akai Professional dealer.
To obtain service under this warranty, the product must, on discovery of the defect, be properly
packed and shipped to the nearest AKAI Service Centre. The party requesting warranty service must
provide proof of original ownership and date of purchase of the product.
If the warranty is valid, AKAI will, without charge for parts or labour, either repair or replace the
defective part(s). Without avalid warranty, the entire cost of the repair (parts and labour) is the
responsibility of the product's owner.
AKAI warrants that it will make all necessary adjustments, repairs and replacements at no cost to the
original owner within 12 (twelve) months of the purchase date if:
1The product fails to perform its specified functions due to failure of one or more of its
components.
2The product fails to perform its specified functions due to defects in workmanship.
3The product has been maintained and operated by the owner in strict accordance with the
written instructions for proper maintenance and use as specified in this Operator's Manual.
Before purchase and use, owners should determine the suitability of the product for their intended
use, and the owner assumes all risk and liability whatsoever in connection therewith. AKAI shall not
be liable for any injury, loss or damage, direct or consequential, arising out of the use, or inability to
use the product.
The warranty provides only those benefits specified, and does not cover defects or repairs needed
as aresult of acts beyond the control of AKAI, including, but not limited to:
1Damage caused by abuse, accident or negligence. AKAI will not cover under warranty any
original factory disk damaged or destroyed as aresult of the owner's mishandling.
2Damage caused by any tampering, alteration or modification of the product: operating
software, mechanical or electronic components.
3Damage caused by failure to maintain and operate the product in strict accordance with the
written instructions for proper maintenance and use as specified in this Operator's Manual.
4Damage caused by repairs or attempted repairs by unauthorized persons.
5Damage caused by fire, smoke, falling objects, water or other liquids, or natural events such
as rain, floods, earthquakes, lightning, tornadoes, storms, etc.
6Damage caused by operation on improper voltages.
IMPORTANT NOTE: This warranty becomes void if the product or its software is electronically
modified, altered or tampered with in any way.
AKAI shall not be liable for costs involved in packing or preparing the product for shipping, with regard
to time, labour or materials, shipping or freight costs, or time and expenses involved in transporting
the product to and from an AKAI Authorized Service Centre or Authorized Dealer.
AKAI will not cover under warranty an apparent malfunction that is determined to be user error, or the
owner's inability to use the product.
THE DURATION OF ANY OTHER WARRANTIES. WHETHER IMPLIED OR EXPRESS, INCLUD-
ING BUT NOT LIMITED TO THE IMPLIED CONDITION OF MERCHANTABILITY, IS LIMITED TO
THE DURATION OF THE EXPRESS WARRANTY HEREIN.
AKAI hereby excludes incidental or consequential damages, including but not limited to:
1Loss of time
2Inconvenience
3Delay in performance of the Warranty
4The loss of use of the product
5Commercial loss
6Breach of any express or implied warranty, including the implied Warranty of Merchantability,
applicable to this product

Table of Contents i
Table of Contents
Introduction ,i
What is the DR4? 1
Features 1
Inside the DR4 ., 2
1Front &Rear Panels 3
Front Panel ............. 3
Rear Panel 8
2Getting Around the DR4 1
1
Sub Menus 11
Setting Parameters a11
Entering Time Values 1
1
Specifying the In Point &Out Point 12
Escape 12
3Setting Up the DR4 13
Siting theDR4..^.u;i.i.*.;.;.i. i;-,d ii ;.v../. 13
Connecting The Power 13
Power On/Off.... 13
Typical DR4 Setup u;;<;.U 14
4Recording 15
Analog Recording Setup iildlQjik&JJlS
Digital Recording Setup 17
Arming Channels 19
Setting Levels 19
Starting &Stopping Recording 19
Manual Punch In/Out 20
Footswitch Punch In/Out 21
Auto Punch In/Out 22
Auto Monitor 23
Rehearsal 23
Recording Undo 24
Recording over Existing Material 25
Available Recording Time Display 25
5Playback 26
Starting &Stopping 26
Play to Out i26
Repeat u^.. 27
Varipitch 28
6Locate Functions 29
Locating to aSpecific Point 29
Direct Locate Points (1-8 Keys) 30
Stack Locate Points 31
Last Memory 32
Preroll.. .:.....„;..„„„................................... 32
7Time Display... 33
Setting Relative Time to Zero 33
Setting aRelative Time Offset; 34
Time Display Relative to Any Point 34
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ii Table of Contents
8Editing 35
Undoing an Edit 35
Copy ....,.,...„,..„..,.,.,..,.,...,.„,......„....,.. 36
Copy+Insert 38
Move. 39
Move+Insert 41
Erase 42
Delete 43
Insert 44
9Hard Disks 45
Choosing aHard Disk 45
MO Disks 45
Hard Disk Size 46
SCSI 46
SCSI-A &SCSI-B 46
SCSI Cables 47
SCSI IDs 47
SCSI Termination 48
Checking Disks on SCSI-A Bus 48
External Hard Disk Operating Precautions 49
Formatting New Disks. 50
Erasing Disks 51
Data Alignment 52
10EICIC*I(U 53
Backup to DAT 53
11MIDI Synchronization 56
IB- 113M MIDI Interface Card 56
Connection &Setup ,56
Operation 56
MIDI Sync Notes .;W.^.J,;.w**>>«* 56
Tempo Map &Beat Map....,.,^.....,,. 57
Changing the Initial Tempo &Beat settings 58
Creating aBeat Map 59
Creating aTempo Map .,.,..,.,.„..,,„„ 60
12 Synchronizing to Other DR4s 6i
AL-X50 Remote Cable ,61
Connection 61
Setup 62
Operation 62
13 Other Functions 63
Appendix 65
Initial Settings 65
Troubleshooting,,,, 66
Display Messages 66
Error Messages ,67
Specifications ,68
MIDI Implementation Chart............. 69
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Introduction 1
Introduction
From all at Akai, thank you for purchasing an Akai DR4 Hard Disk Recorder, and welcome to
the exciting world of hard disk recording. Reading through this manual will provide you with
agood understanding of what the DR4 is all about.
What is the DR4?
rIf you think of aconventional four-trapkrecorder, replace all the analog circuitry with the latest
digital audio processing technology, replace the tape transport with ahard disk for near-instant
digital audio data access, you won't be far off the DR4 concept. The following feature list will
fill you in on the rest.
The DR4 uses hard disks as its recording media. You can extend the available recording time
according to your budget by adding external hard disks or using alarger internal hard disk. In
addition, the DR4 provides nonlinear audio playback, and you can specify edit points and
search and locate with frame accuracy.
The DR4 is not supplied as standard with an internal hard disk drive. Use Akai's optional
HD240 240MB internal hard disk, or consult your Akai professional dealer for details about
other DR4 compatible hard disk drives.
Features
•4-channel hard disk recorder.
•16-bit linear PCM recording.
•17 channel minutes per 100MB of hard disk (fs @48 kHz).
•Up to four units can be connected fbriS l^ channel system.
•Up to seven SCSI hard disks can be connected.
•16-bit 64-times oversampling A/D converters.
•18-bit 8-times oversampling D/A converters.
•Near-instant data access, no time consuming rewinds, etc.
•Instant playback start.
•Repeat playback with no gaps.
•8direct locate points. 100 stack locate points.
•Absolute and relative time modes, with sync offset.
•Beat/tempo map for MIDI Clock master operation.
•Adjustable preroll.
•Varipitch.
•Punch in/out includes: manual, auto (with rehearsal), and footswitch.
•Jog/shuttle wheel for locating edits.
•Edit functions include: copy, copy+insert, move, move+insert, erase, delete, insert, and edit
undo.
•Balanced 1/4 inch phone jack analog inputs and outputs (44 dB or-lOdB).
•XLR and RCA/phono digital inputs and outputs (AES/EBU or S/PDIF).
•Backup to DAT via digital I/O
•Optional IB- 113M MIDI Interface for MIDI sequencer synchronization.
•Optional IB- 110D Digital Interface allows four channel playback &recording via digital I/O.
•Optional HD240 240MB hard disk can be installed.
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2Chapter: Introduction
inside the DR4
Analog input
Analog output
Options
I
"
IB-113M MIDI Interface i
IB-112T SMPTE Interface !
.IB-111SSCSI-B Interface '
"
Digital audio
data processor
I
Optional
HD240
Hard disk
•m
SCSI-A
Hard disk
mmmmmm
IB-JIODJ
Option
<X3
ZERO
RETURN
Remote
DR4 |
DF
Recording media Synchronization to other DR4s
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Front &Rear Panels 3
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4Chapter: 1Front &Rear Panels
1) POWER switch
This is the power switch. The rocker part of this switch is recessed in the ON position to
prevent accidental power off.
2) PHONES LEVEL
This control adjusts the headphone volume level
3) PHONES connection
Astereo pair of headphones can be corpected to this 1/4 inch stereo phone jack. Channels 1
and 3are on the left, channels 2and 4are on the right.
4) FOOT SW connection
Anormally closed type footswitch can be connected here for punch in/out operation. See
"Foot switch Punch In/Out" on page 21.
5) AUTO MONITOR key
This switch turns the auto monitor on and off. In the on position, monitoring is automatically
switched between playback and source when recording. The off position allows you to monitor
the source during playback too. This is useful for practising with existing tracks before
recording. See "Auto Monitor" on page 23.
6) REHEARSAL key
This key turns the rehearsal function on and off. Rehearsal allows you to rehearse punch ins
and outs. During arehearsal, the monitor will switch to source at the punch in point, but
nothing will be recorded. See "Rehearsal" on page 23.
7) REC keys 1-4
These keys are used to arm channels for recording. Aflashing key indicates that achannel is
armed for recording, and alit key indicates recording in progress. See "Arming Channels" on
page 19.
8) INPUT SELECT keys 1/2, 3/4
These keys are used to select the input source, analog or digital, for each pair of channels. LED
indicators show the currently selected source. See "Selecting the Analog Inputs" on page 16
and "Selecting the Digital Inputs" on page 18.
In the sub menu, these keys are used to select the type 1and type 2digital signal formats for
the digital inputs and outputs. See "Selecting the Digital Input Connection Type" on page 17
and "Setting the Digital Output Format" on page 18.
9) PEAK LEVEL METER
These 20-segment LED bargraphs with peak hold indicate the playback and source signal
levels.
10) DISPLAY
These eight 7-segment LED digits display disk time, either absolute or relative. They are also
used for entering and displaying locate points. In BBC mode, they indicate bar, beat, and clock.
Sub menu settings and error messages are also displayed.
The small dot at the bottom right of each digit also has aspecial function:
The left most dot indicates that the hard disk is being accessed.
The second dot indicates the disk access condition. Under normal operation it will flash. Ifdata
access activity is excessive, it will be lit constantly. In this case, use the align function. See
"Data Alignment" on page 52.
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Front Panel 5
The four clots from, the right, 1,2,3,4 from left to right, indicate that data exists on achannel
at the current position. If this dot is lit but -nothing is output during playback, this indicates a
recorded blank area. Although blank areas do not contain any data, they do use hard disk space,
so it's best to erase them in order to free up the space.
1!) BBC DISPLAY key
This key switches the display to BBC mode: Bar, Beat, and Clock. This mode is mainly used
when the DR4 is working as aMIDI Clock master with the optional IB-1 13M MIDI Interface.
See "MIDI Synchronization" on page 56.
12) RESET key
This key is used to reset the relative time to zero. If it is pressed while an absolute time is
displayed, relative time will be selected automatically, just like pressing the ABS/REL key.
13) ABS/REL key
This key switches the display between absolute time and relative time. Absolute time starts at
zero, cannot be changed, and works as the base time for relative time. When synchronizing via
SMPTE or MIDI, the relative mode can be used to set synchronization offsets.
14) IN key
This key is used to set and locate the in point. The in point is the point at which repeat playback
starts and auto punch in occurs. It is also used to specify the beginning of asection when
editing.
15) «PLAY» key
This key is used to play back the section between the in point and out point.
16) OUT key
This key is used to set and locate the out point. The out point is the point at which repeat
playback ends and auto punch out occurs. It is also used to set the end of a section when editing.
17) AUTO PUNCH key
This key switches the DR4 to auto punch in/out mode. In this mode, punch in will occur
automatically when the in point is reached. Likewise, punch out will occur automatically when
the out point is reached.
18) REPEAT key
This key is used to switch on repeat mode. In this mode, playback will be repeated between the
in point and out point. This is similar to the repeat function found on many tape based
recorders. However, with the DR4 there is no rewind time between out point and in point
-repeated playback cycles round like acontinuous loop.
19) Rewind key
This key is like the rewind key found on most conventional tape recorders. In stop mode, it
activates time display fast rewind. In play mode, it activates playback review.
20) Fast Forward key
This key is like the fast forward key found on most conventional tape recorders. In slop mode,
it activates time display fast forward. In play mode, it activates playback preview.
21) Play key
This key is used to start playback. Pressing this key while holding down the REC key will start
recording.
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6Chapter: 1Front &Rear Panels
22) REC key
This key (in combination with the play key) is used to start recording. It lights up while
recording is in progress,
23) ZERO RETURN key
In absolute mode, this key will locate to the absolute 00:00:00:00 point, In relative mode, it
will locate to the relative 00:00:00:00 point.
:
24) Stop key
This key is used to stop playback, recording, fast forward, and rewind.
25) PLAY TO OUT key
This key will start playback at aspecified number of seconds before the current position, i.e.,
the currently displayed time. Playback will stop when that current position is reached. This is
useful for confirming edit points. The number of seconds can be specified in the TIME sub
:-: menu. .:/:/, ;v:
\\ -hd;;
26) JOG wheel
The jog wheel allows you to locate while listening to arecording. Playback speed is determined
by how fast you turn the wheel. Turn it counterclockwise to review and clockwise to preview.
This wheel is also used to set parameter values. Turn it counterclockwise to decrease values
and clockwise to increase them.
27) SHUTTLE control
Like the JOG wheel, the shuttle control also allows you to locate while listening to arecording.
The playback speed can be 1/4, 1/2, x2, x4 normal speed, and is determined by the angle at
which you hold the control. Turn it counterclockwise to review and clockwise to preview.
This control is also used to set parameter values in single steps. Turn it counterclockwise to
decrement avalue one step, and clockwise to increment one step.
28) UNDO key
This key allows you to undo the last recording or edit. This is useful if you make amistake
while recording and want to return to the previous recording. Likewise, when editing you can
compare the material before and after an edit. See "Recording Undo" on page 24 and "Undoing
an Edit" on page 35.
29) EDIT key
This key is used to select the edit functions. See "Editing" on page 35.
30) SUB MENU key
This key is used to select sub menu functions. To select a sub menu function, press this key,
then press the corresponding sub menu key. The names of sub menu functions appear
underneath certain keys in grey boxes.
31) SYNC key
This key is used to activate synchronization with an external device. Up to four DR4s can be
synchronized using Akai AL-X50 Remote Cables. An optional IB-1 13M MIDI Interface or
IB- 1 1 2T SMPTE reader is required for MIDI and SMPTE synchronized operation.
32) VARI key
This key switches on the varipitch function for playback. The amount of varipitch is set using
the VARI sub menu function. See "Varipitch" on page 28.
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Front Panel 7
33) TEMPO key
This key is used when creating atempo map. Tempo maps are used when the DR4 is used as
aMIDI Clock master with the optional IB-.l 13MMIDI Interface. See "MIDI Synchronization"
on page 56.
In the sub-menu, it is used for creating abeat map. See "Creating aBeat Map" on page 59.
34) Keypad 1~8
These keys are used to store and recall the eight direct locate points, enter time values, and set
parameter values.
35) LOCATE 9key
This key is used to enter locate time values. See "Locating to aSpecific Point" on page 29. It
is also used for entering time values and setting parameter values.
36) LASTO/-
This key is used to locate to the last two points at which the stop key was pressed. Press the
key once to locate to the last point at which the stop key was pressed. Press again to locate to
the last but one point. See "Last Memory" on page 32.
This key is also used for entering time and parameter values, and entering negative values.
37) PREROLL key
This key is used to switch on the preroll function. Preroll refers to aspecified number of
seconds before the specified locate point. For example, if the preroll value is set to 5, the DR4
will locate to apoint 5seconds before the specified locate time. The preroll value is set using
the PREROLL sub menu function. See "Preroll" on page 32.
38) STACK key
This key is used to enter and recall the 100 stack locate points. See "Stack Locate Points" on
page 31.
39) ESCAPE key
This key can be used to escape from the current edit or sub menu function. It can also be used
to escape from incorrectly entered time values
40) STORE/ENT key
This key is used when entering and storing time values, executing edit functions, etc.
41) REMOTE connection
This connection is used for connecting the optional DL4 Remote Controller and synchronizing
other DR4s.
42) THRU connection
This connection is used for synchronizing other DR4s.
Note: Use only Akai AL-X50 cablesfor REMOTE and THRU connections.
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8Chapter; !Front &Rear Panels
Rear Panel
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Rear Panel
1) ANALOG INPUT
These 1/4 inch stereo phone jacfe a^ used to input analog signals to the DR4. They accept
balanced and unbalanced signals: Tip mhot, xirig scold, sleeve =ground. :
2) Input GAIN switch
These switches allow you to set the DR4 input gain. They can be set to -10 dB or +4 dB. Input
gain switches are provided for channels 1/2 and channels 3/4.
3) ANALOG OUTPUT
These 1/4 inch stereo phone jacks are used to output analog signals from the DR4. They can
be used balanced or unbalanced: Tip =hot, ring =cold, sleeve =ground.
4) Output GAIN switch
These switches allow you to set the DR4 output gain. They can be set to -10 dB or +4 dB.
Output gain switches are provided for channels 1/2 and channels 3/4.
The actual output gain depends whether you use the outputs balanced or unbalanced. The
following table shows the actual gain for each possible setting:
Connection Type Switch Setting
-10 dB +4dB
Balanced -4dB +4 dB
Unbalanced -10 dB -2dB
0dB =0.775 V
5) DIGITAL l/O-A IN
These XLR and RCA/phono connectors are used to input AES/EBU and S/PDIF format digital
signals respectively. The active input is selected using the DIN sub menu function. See
"Selecting the Digital Input Connection Type" on page 17.
Without the optional IB- HOD Digital Interface, the left channel digital signal is fed to
channels 1and 3. Similarly, the right channel digital signal is fed to channels 2and 4. For this
reason, it is not possible to record more than two channels simultaneously via the digital inputs.
If you do need to record three or four channels simultaneously via the digital inputs, use the
optional interface.
6) DIGITAL l/O-A OUT
These XLR and RCA/phono connectors are used to output AES/EBU and S/PDIF format
digital signals. The format of the digital output signal is set using the DOUT sub menu
function. See "Selecting the Digital Input Connection Type" on page 17.
Without the optional IB- HOD Digital Interface, only channel signals 1and 2can be output
digitally. If you need to output three or four channels simultaneously via the digital outputs,
use the optional interface.
You can backup all four channels to aDAT recorder via digital outputs 1and 2even without
the optional IB- 11OD Digital Interface.
7) DIGITAL l/O-B option slot
An optional IB- 11 OD Digital Interface can be installed into this slot. This interface allows
digital signals for channels 3and 4to be input and output independently of the DIGITAL
I/O-A connections.
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10 Chapter: 1Front &Rear Panels
8) SCSI-B ID
This DIP switch is for use with the optional IB-I1IS SCSI interface. It is used to set the DR4's
SCSI ID and termination for SCSI-B bus. This bus is for backing up to an MO disk and
connecting to personal computers.
This switch has no effect on SCSI-A bus. (Ui'Uue -SiNl
9) Option slots
These option slots are for installing the following interface cards: 1B-112T SMPTE Reader,
IB-113M MIDI Interface, and IB-IIIS SCSI-B Interface.
10) SCSI-A connection
For increased recording time, up to six external SCSI hard disks can be connected to this
connection (up to seven with no internal hard disk). See "Hard Disks" on page 45.
11) Power inlet
Connect the supplied power cable to this connection. Connect the other end of the power cable
to an appropriate AC receptacle.
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