Tascam Powered Mixer Av-452 Installation And Support Guide

							
4 – Remote control unit features
 TASCAM AV-452 Installation & Support Guide 11
9[DVD keys] Use these programmable keys to 
control a DVD player.
A ICOM key This key duplicates the function of 
the 
INTERCOM key on the AV-452 (G).
B CASCADE IN key This key duplicates the 
functions of the 
CASCADE key on the AV-452 (F).
C AV DIM key This key duplicates the func-
tions of the AV 
DIM key on the AV-452 (6).
D LEARN key Use this key when learning the 
commands for other units (see below).
E VOL + and – keys These keys operate the 
ROOM VOLUME control (C).
Learning command codes
The RC-452’s design allows it to be used for the con-
trol of up to five devices in addition to the AV-452: 
projector or display (
TV/PROJECTOR), audio cas-
sette recorder (
CASSETTE), videocassette recorder 
(
VCR), CD recorder (CD-RW), and DVD player 
(
DVD).
Of course, the devices and functions that you pro-
gram for them do not have  to match absolutely with 
those marked on the AV -452 and RC-452, but it 
makes sense to map the target units to the RC-452’s 
labels.
To teach remote control commands from another 
remote control unit to the RC-452:
1Make sure that both the RC-452 and the other 
equipment’s remote control unit have batter-
ies installed, and place them on a flat surface, 
about 2–3  cm (about an inch) apart, facing 
each other.
2On the RC-452, press and hold the SET key 1 
and then press the 
LEARN key D. Release 
these keys. The 
SET indicator lights steadily.
3Within 10 seconds of the previous step, press 
the  ,  key of the RC-452’s 
VCR section 7 
three times . 
The 
SET indicator 1 of the RC-452 flashes as 
you press it and remains lit to show the unit is 
now in learning mode.
4On the RC-452, press the key which will be 
mapped to the other equipment’s function.
The 
SET indicator 1 of the RC-452 starts 
flashing rapidly to show that learning is 
started.
5On the other equipment’s remote control unit, 
press the key to be learned. The RC-452’s 
SET 
indicator 
1 stops flashing rapidly and lights 
steadily for a short time, goes out briefly  once 
and then lights steadily to show that the com-
mand has been learned.
If the RC-452’s SET indicator goes out 
briefly  three times and then lights steadily, it 
means that the learning command has not 
been properly learned.
If the RC-452’s SET indicator goes out 
briefly  six times and then lights steadily, it 
means that the RC-452’s memory is full, and 
no more commands can be learned.
6Repeat steps 4 and 5 until all appropriate 
commands have been learned.
7To exit the learning mode, press the RC-452’s 
LEARN key D. The SET indicator goes out (it 
also goes out if no keys are pressed on the RC-
452 for about 10 seconds).
NOTE
The RC-452 can learn and store up to 36 different com-
mands.
The angle and distance be tween the two remote con-
trol units affects the difficul ty of the learning process.
The RC-452 may not be able to learn some units’ com-
mands which use long IR codes for transmission.
2-3 cm (1)
 RC-452 Other equipments
remote control unit 
						

							
12 TASCAM AV-452 Installation & Support Guide
5 – Rear panel connections
This section provides detail ed information on the rear 
panel connectors, as well as  some notes on installa-
tion and connection of other units. Basic specifications and performance figures are pro-
vided later in the manual.
Video connections
All video connections on the AV-452 switch in paral-
lel.  There is no conversion between composite and 
S-Video signals.  In some designs, you may need to 
connect both video format
s to the source decks.
This also means that the AV -452 is standard-indepen-
dent and can accept NTSC, PAL or SECAM format 
video with no configuration needed.
In addition to these connec tors, remember that there 
is an additional 
AU X video connector on the front 
panel 
D.
NOTE
All connectors on the rear panel are labeled relative to 
the AV-452. In other word s, a connector labeled 
IN on 
the AV-452 should be connected to one marked 
OUT on 
another piece of equipment.
L RGB2 THRU connector This 15-pin D-
sub connector echoes the signal input at the front 
panel input 
K.
M DVD IN connectors This pair of connec-
tors is used to connect the video output of a DVD 
player to the AV-452.
N VCR IN and OUT connectors Connect 
the video output of a videocassette recorder to the 
VCR IN, and the video input of the VCR to the VCR 
OUT.
O MONITOR OUT connectors Link these 
connectors to the appropri ate input of a TV, monitor 
or projector.
345612ONDIP01234566789
Video connections AV audio & microphone 
connections
Master audio 
connections
External control connectors
LM N O 
						

							
5 – Rear panel connections
 TASCAM AV-452 Installation & Support Guide 13
AV audio and microphone connections
NOTE
The AV-452 is supplied with  several sets of shorting 
plugs for the unused RCA input connectors. Remove 
these when making connection s to these terminals, and 
leave them in place when these terminals are unused. 
This will help to improve the audio performance of the 
system.
In addition to th e connections listed here, there is 
also a pair of 
AUX audio inputs Don the front panel.
NOTE
All XLR-type connectors are wi red with pin 1 to ground, 
pin 2 hot, and pin 3 cold.
P DVD IN connectors This pair of connec-
tors accepts the audio outputs of a DVD player.
Q VCR OUT and  IN connectors These 
pairs of connectors feed the audio inputs of a video-
cassette recorder (
OUT) and accept the output signals 
from the VCR (
IN).
R CD-RW OUT and IN connectors These 
pairs of connectors feed the inputs of a CD recorder 
(
OUT) and accept the output  signals from the CD re-
corder (
IN).
S CASSETTE OUT and IN connectors 
These pairs of connectors f eed the inputs of a cas-
sette recorder (
OUT) and accept the output signals 
from the cassette recorder (
IN).
T MIC GRP INSERT connector This TRS 
1/4 connector is used to pass the summed micro-
phone signals through a dynamics processor (limiter, 
gate, etc.) or a graphic or  parametric EQ unit, etc. 
The connector is wired with tip = send, ring = return, 
sleeve = ground).
U PHANTOM POWER switch Use this 
switch to provide +48V phantom power to condenser 
microphones. All four microphone inputs are acti-
vated with the same switch.
Do not use dynamic microphones connected with an 
unbalanced connection or high-impedance micro-
phones, with phantom power turned on.
NOTE
To avoid possible damage to microphones, always con-
nect microphones, turn down the 
ROOM VOLUME 
control, and turn the speakers off using the 
AMP A and 
AMP B keys, before switchin g the phantom power on 
or off.
V MIC 1 through 4 connections Micro-
phones can be connected using the XLR connectors.  
In permanent installations  where wires are being run 
through walls, the bare wire s can be connected to the 
barrier strip instead.
Do not connect microphones via the XLR and barrier 
strip connections of the same microphone channel 
(though it is possible to connect some microphones 
via the XLR connectors an d some via the barrier 
strip).
Always make sure that polarity is observed consis-
tently throughout the insta llation, in order to avoid 
phase reversal problems.
PQ R S
TU V 
						

							
5 – Rear panel connections
14 TASCAM AV-452 Installation & Support Guide
“Master” audio connections
These connections relate to  the audio functions of the 
AV-452 which play a “maste r” role in the setup and 
operation of the unit. 
W CASCADE INPUT connectors These 
balanced XLR connectors accept balanced signals 
from another AV-452 (or si milar unit). These input 
signals are selected using the front panel 
CASCADE 
key 
F and are pre-ROOM VOLUME.
Depending on the position of the rear panel DIP 
switch (CASCADE (switch 2) on page 17), the 
cascade input signal can sum  with the AV-452 audio, 
or can replace it.
X LINE OUTPUT connectors These bal-
anced XLR connectors output the post-
ROOM 
VO L U M E
 mix (to another AV-452 unit or power 
amplifier).
Y MEETING OUT connectors These un-
balanced RCA jacks outputs the pre-
ROOM 
VO L U M E
 mix.
One use for this facility is  to connect a recorder to 
log the proceedings of meetings, etc.
Z SPEAKER OUTPUT A and B 
connectors 
Connect speakers to these binding 
post terminals. Take care to observe polarity to avoid 
out-of-phase problems.
The speakers attached to these terminals can be 
switched individually using  the selector keys on the 
front panel 
I. The impedance of the speaker system connected to 
each channel should be between 4 
Ω and 16  Ω.
WARNING
Use of speakers with impedances outside these limits 
may result in damage to  the speakers and/or the AV-
452.
Also note that the AV-452 should not be operated in 
bridged mono mode.
Depending on the DIP switch setting (SPEAKER 
OUT (switch 3) on page 17), and the 
LINE OUTPUT 
mode switch 
e, the AV-452 may be configured as a 
dual mono amplifier, or as a stereo amplifier.
In the latter case, channel  A corresponds to the left 
channel, and channel B  to the right channel.
aEMG IN and GND connectors Use these 
barrier strip connectors to attach a 5 Vrms emergency 
signal cable.
When this signal is activat ed, the AV-452 will cut the 
signals from the 
LINE OUTPUT X and SPEAKER 
Z terminals and all front panel indicators flash.
b INTERCOM connectors (CV IN)  Use 
these connectors to attach  the cables from a constant 
voltage (CV) intercom system.
Before connecting the AV-4 52 to such an intercom 
system, confirm the voltage  used by the intercom 
system. The AV-452  can work with intercoms using 
12, 24 or 70 volts. When the speaker signal arrives at 
the AV-452, it is converted  by the AV-452 into a line 
level signal, where it is ad ded to the line and speaker 
outputs (but not to the 
MEETING OUT or PHONES).
345612ON DIP0
1
2
3
4
5
6
7
8
9
WX Y
Zabcde 
						

							
5 – Rear panel connections
 TASCAM AV-452 Installation & Support Guide 15
Note the following levels and input impedances, cor-
responding to the different  connectors on the barrier 
strip:
The level of the intercom si gnal is set as explained 
below, and a squelch circuit is also available 
d. The 
intercom signal is enable d and disabled using the 
front panel 
INTERCOM key G.
c AV DUCKER RATIO and THRESH 
controls 
These trimmer pots are used if the AV 
ducking facility is enable d using the DIP switches 
(see Customization and settings on page 16). If this 
facility is not enabled, these controls have no effect.
If this is enabled, the amount by which the currently-
selected AV signal is ducked is set between –6 and   
–20 dB, depending on the position of the
 RATIO 
trimmer pot. Turn this pot clockwise to increase the 
amount that the AV signal is dimmed. The 
THRESH trimmer pot adjusts the threshold level 
of the microphone signal at which the ducking facil-
ity operates. Turn this pot clockwise to increase this 
trigger level.
d LEVEL and GATE THRESH controls 
These two trimmer pots are used with the 
INTERCOM signals input at b.
The 
LEVEL control adjusts the level of the intercom 
signal fed to the mix (post-
ROOM LEVEL). Turn this 
clockwise to increase the level of the signal.
The 
GATE THRESH squelch control is used to con-
trol the threshold of a no ise gate, which opens when 
the level of the intercom signal exceeds this level. 
This allows an otherwise s lightly noisy intercom to 
be connected without inte rfering with the other 
signals.
e LINE OUTPUT mode switch This switch 
allows the line output 
X of the AV-452 to act as two 
mono line sources, driving  auxiliary amplifiers, etc. 
in two locations, or it allows it to act as a stereo am-
plifier, driving another stereo unit. 
External control connectors
There are two D-sub connectors, used for external 
control of the AV-452.
The details relating to these connectors are described 
in External control on page 18.
f RS-232 serial port This female 9-pin D-
sub port accepts and receives serial signals, allowing 
the AV-452 to be controlled by a serial device. See  the document 
Serial Protocol Reference  (available on 
request from your TASCAM dealer or distributor) for 
full details of the format  and content of the serial 
commands and messages.
NOTE
Although the connector is marked RS-232, it can be 
used for RS-422 and RS-485  serial data interchange as 
well as for RS-232 format data.
g RELAY CONTROL connector This 
female 37-pin D-sub connector accepts commands 
and transmits tally signals. It  also can be used to con-
nect a wired IR “blaster  “ transmitter for the control 
of other devices, such as a video projector or monitor.
h SERIAL ADDRESS  selector Use this to 
select the serial address (
0 through 9) of the AV-452 
when controlling it us ing RS-485 commands.
iCUSTOMIZE DIP switches See the fol-
lowing section for the meanings of these configura-
tion switches.
Connector Level, input impedance
70V70 V,  40 kΩ
24V24 V,  12 kΩ
12V12 V,  4.7 kΩ
f
g
345612ON DIP0
1
2
3
4
5
6
7
8
9
hi 
						

							
16 TASCAM AV-452 Installation & Support Guide
6 – Customization and settings
The customization and settin gs of the AV-452 are 
made using a set of six DIP switches. These switches are as follows:
These are explained here:
LEARN IR (switch 1)
This function allows the AV-452 to learn the IR codes 
for direct control of a monitor, video projector, etc. 
allowing the external video source for the video dis-
play unit to be selected using the AV selection keys 
as well as the 
RGB 1 and RGB 2 keys.
This allows the video signal of different devices to be 
hooked up directly to the monitor and switched to-
gether with the audio from one control surface (the 
AV-452 or the RC-452).
An external IR “blaster” (not supplied) must be con-
nected to the AV-452 for control of the video display 
unit.
Learning the external IR commands In the 
following explanation, we  assume that the AV equip-
ment is hooked up to a multi-input video display 
device in the following way:
Not shown here is the IR blaster device, connected to 
the relay control 
g connector of the AV-452 and 
pointing at the video monitor’s IR receiver. Here we are programming the 
DVD key on the AV-
452 to switch the video monitor to the  S-Video input.
1Make sure the power to the AV-452 is OFF.
2Set the LEARN IR switch (switch 1) to ON. 
3Turn ON the AV-452. The AMP A, AMP B, 
INTERCOM and CASCADE keys on the front 
panel flash to show the unit is in IR learn 
mode.
4Press the DVD key on the AV-452 front panel. 
It starts to flash.
5Point the video display device’s remote control 
unit at the AV-452’s
 IR SENSOR H and press 
the key which enables the S-Video input on the 
remote control unit of the video display device.
If a valid IR code is received and stored, the 
DVD key stops flashing.
If the IR code is not received and stored cor-
rectly, the 
DVD key continues to flash.
NOTE
The AV-452 only supports the NEC type IR command 
specification. If the key continues to flash, and you are 
sure that the source chan ge command has been trans-
mitted, the video display devi ce may not conform to the 
NEC ITR command specification.
6Press another AV selection key (for example, 
the 
RGB 1 key) and the corresponding input 
key on the video remote control unit of the 
video display device to learn this command. 
7When you have finished programming these 
commands, set the 
LEARN IR switch (switch 1) 
to 
OFF. 
The AV-452 resets itse lf and starts normal 
operation.
Switch Function Up position Down position
1Learn IR codes(LEARN IR)ON OFF
2
Cascade mode (CASCADE)Exclusive (EXC) Summed (SUM)
3Speaker outputs (SPK OUT) Mono (MON)Stereo (ST)
4Microphone high-pass filter (MIC HPF)ON OFF
5
Intercom gate function (INT GATE)ON OFF
6
AV ducking facility (AV DUCKER)ON OFF
AV-452
DVD player
DVD INVCR
VCR IN
Camcorder
AUX IN
RGB 2
(RGB 1)
VGA 1Video display
VGA 2
RGB 2 THRU
Composite 1
VCR OUTAUX OUT
Composite 2
DVD OUT
S-Video
Video
Audio 
						

							
6 – Customization and settings
 TASCAM AV-452 Installation & Support Guide 17
CASCADE (switch 2)
This switch determines the  use of the audio signals 
received at the 
CASCADE IN connectors W when 
the 
CASCADE key F is activated.
In the 
EXC (exclusive) setting, the input cascade 
signal replaces the direct input signals at both the 
LINE OUTPUT Xand SPEAKER OUT Z terminals.
In the 
SUM setting, the cascaded signal is summed 
(pre 
ROOM LEVEL) with the direct input signals 
from the 
LINE OUTPUT Xand SPEAKER OUT Z 
terminals (as well as the 
MEETING OUT Y and 
PHONES J).
NOTE
Remember that this only applies to audio signals. You 
cannot cascade video signals using the AV-452.
The cascade and intercom Note also that 
when the switch is set to the 
EXC (exclusive) setting, 
the CV intercom input is disabled. The front panel 
INTERCOM key G will not light if the switch is set 
to 
EXC. Also, when the switch is in this position, 
pressing the 
INTERCOM key will cause the key to 
flash briefly, indicating that the intercom input is 
disabled.
SPEAKER OUT (switch 3)
This switch determines whether the signal sent to the 
SPEAKER OUT Z terminals is the same from both 
speakers (left and right summed) (
MON) or whether 
it is a stereo signal (
ST).
If the mono option is chosen, it is possible to use the 
AV-452 to control the sound fed to either or both of  two rooms, switchable using the 
AMP keys on the 
front panel 
I.
NOTE
This switch setting only affects the speaker outputs. It 
does not affect the 
LINE outputs X, which are 
switched between mono and stereo with a dedicated 
switch 
e.
MIC HPF (switch 4)
This switch enables or disables an 80 Hz high-pass 
filter added to the summed microphone signals. Use this filter to cut out wi
nd noise, floor rumble, etc. 
from microphones which ar e located in less than 
acoustically perfect environments.
INTERCOM GATE (switch 5)
This switch enables or disables the intercom squelch 
circuit (noise gate).  When this switch is in the OFF position, the GATE 
THRESH
 trimmer pot d has no effect.
AV DUCKER (switch 6)
This switch enables or disables the AV ducking 
circuit.  When this switch is in the OFF position, neither of 
the 
AV DUCKER trimmer pots: the RATIO or 
THRESH c controls, has any effect. 
						

							
18 TASCAM AV-452 Installation & Support Guide
7 – External control
The AV-452 can be controlled from other units in two 
ways.
The first is a serial protocol, as used by many AV 
controller vendors. This allows a number of AV-452  units to be controlled from a personal computer, as 
well as by these dedicated controllers.
The second is by using the 
relay connector, allowing 
a number of external relay controls and tally indica-
tors to be connec ted to the AV-452. 
AV-452 serial protocol
NOTE
A separate document “AV-452 Serial Control Protocol”, 
providing details on the impl ementation of the serial 
control, is available on request from your TASCAM 
dealer or distributor. If you are implementing the serial 
protocol, you may choose to provide your “back-room” 
systems integration team wi th the separate document, 
and to keep a copy to hand  for troubleshooting on site.
The serial port can operate as a RS-232, RS-422 or 
RS-485 port (as determined by the controller or  PC).The AV-452 is fitted with a standard 9-pin D-sub 
serial port, as well as a rotary address selector switch 
h, allowing it to take an ID from 0 through 9.
This allows a number of AV-452 units to be chained 
together and controlled from a single source.
NOTE
Only set the serial address wi th the power to the AV-452 
turned off as the AV-452 will  only recognize the setting 
at power-on.
Serial port pinouts
The diagrams above show the AV-452 rear panel con-
nector. Any cable connectors will accordingly be 
mirror images of the above. 
The transmission speed is  always 9,600 bps, with a 
character length of 8 bits, and no parity. The com-
mand spacing is >25 ms. The RS-422 and RS-485 implementations follow 
standard specifications.
The RS-232 operation is a modification of the RS-
422 port, operating at 0 to 4.5 V, rather than ±9 V. It 
should work with most 
older control systems and 
PCs, but if you have problems with using this proto-
col, try using the controller  with RS-422, if possible, 
to remedy the situation.
Relay control port
There is also a 37-pin D-sub connector gwhich may 
be used for relay control of the AV-452 and connect-
ing tally indicators.
The following should be  taken into account when 
connecting external equipment to the AV-452 using 
this port: The relay outputs are low when active, and must be 
low for at least 50 ms.
The maximum current is 20 mA, and the maximum 
voltage is 30 V.
The tally indicator outputs are open collector.
RS-232 RS-422 RS-485
Pin 2: Rx- Data
Pin 3: TX- Data
Pin 5: GroundPin 2: Rx- Data
Pin 3: Tx- Data
Pin 5: Ground
Pin 6: Rx+ Data
Pin 7: Tx+ DataPin 2: TxRx- Data
Pin 3: TxRx- Data
Pin 5: Ground
Pin 6: TxRx+ Data
Pin 7: TxRx + Data
GND Rx-
Tx-GND Rx-
Tx-
Rx+
Tx+GND TxRx-
TxRx+ 
						

							
7 – External control
 TASCAM AV-452 Installation & Support Guide 19
IR “blaster”
Note that pin 21 (and pin 2, +5V) may be connected 
to an IR “blaster” device, which can be used to relay 
command codes from the AV-4 52 to an external mon-
itor or projector, etc.
The procedure for learning these command signals is 
described in LEARN IR (switch 1) on page 16. An IR blaster that has been
 found to work well with 
the AV-452 is th e Xantech 283M IR emitter. Please 
consult your TASCAM distributor for up-to-date de-
tails of other suitable units th at can be used with your 
AV- 4 5 2 .
RELAY CONTROL pinouts 
Pin # Signal Meaning Pin # Signal Meaning
1 GND GND 20 NC
2 +5V +5V (50 mA maximum) 21 IR OUTPUT Connect the wired IR remote device
3 MIC 1 MUTE Turns the MIC 1 MUTE on and off 22 MIC 1 MUTE Tally
4 MIC 2 MUTE Turns the MIC 2 MUTE on and off 23 MIC 2 MUTE Tally
5 MIC 3 MUTE Turns the MIC 3 MUTE on and off 24  MIC 3 MUTE Tally
6 MIC 4 MUTE Turns the MIC 4 MUTE on and off 25  MIC 4 MUTE Tally
7 A/V DIM Turns the AV DIM on and off 26  A/V DIM Tally
8 CASSETTE Selects Cassette as the AV source 27  CASSETTE Tally
9 RGB 1 Selects RGB 1 as the Projector or RGB monitor source 28  CD-RW Tally
10 RGB 2 Selects RGB 2 as the Projector or RGB monitor source 29  DVD Tally
11 CD-RW Selects CD-RW as the AV source 30  VCR Tally
12 DVD Selects DVD as the AV source 31  AUX IN Tally
13 VCR Selects VCR as the AV source 32  RGB 1 Tally
14 AUX IN  Selects AUX IN as the AV source 33  RGB 2 Tally
15 AMP A Turns the AMP A output on and off 34  AMP A Tally
16 AMP B Turns the AMP B output on and off 35  AMP B Tally
17 INTERCOM Activates the INTERCOM input 36  INTERCOM Tally
18 CASCADE Activates the CASCADE input 37  VOLUME DOWN Volume down
19 VOLUME UP Volume up
1
2
3
4
20
21
222.2 NF
+5V
GND
NC
MIC 1 MUTE C
MIC 1 MUTE T
MIC 2 MUTE C
IR OUTPUT
RELAY CONTROLD-SUB 37P
AV-452 
IR Blaster
R
+5V
10k1k
+5V
10k1k
GND
+5V
N
ULN2803AP 
						

							
20 TASCAM AV-452 Installation & Support Guide
8 – Specifications and block diagram
Video specifications
Composite inputs All composite inputs are 
through RCA jacks.
S-Video inputs All S-Video inputs are through 4-
pin mini-DIN connectors.
Composite outputs All composite outputs are 
through RCA jacks.
S-Video outputs All S-Video outputs are 
through 4-pin mini-DIN connectors.
RGB 2 connections 
AV audio and microphone specifications
AV audio inputs All inputs are made through 
RCA pin jacks (unbalanced).
AV audio outputs All outputs are made through 
RCA pin jacks (unbalanced).
Microphone group insert Made through TRS 
1/4 jack:
Microphone inputs The following figures apply 
to connections made via the XLR connectors and the 
barrier strips.
AUX I N75Ω, 1  Vp-p
VCR IN75Ω, 1  Vp-p
DVD IN75Ω, 1  Vp-p
VCR IN75Ω, 1  Vp-p
DVD IN75Ω, 1  Vp-p
VCR OUT75Ω, 1  Vp-p
MONITOR OUT75Ω, 1  Vp-p
VCR OUT75Ω, 1  Vp-p
MONITOR OUT75Ω, 1  Vp-p
RGB 2 IN15-pin D-sub female
RGB 2 THRU15-pin D-sub female
CASSETTEInput impedance, 47 kΩ, Nominal input level -10 dBV 
(–7.8 dBu)
CD-RWInput impedance, 47 kΩ, Nominal input level –10 dBV 
(–7.8 dBu)
VCRInput impedance, 47 kΩ, Nominal input level –10 dBV 
(–7.8 dBu)
DVDInput impedance, 47 kΩ, Nominal input level –10 dBV 
(–7.8 dBu)
AUX I NInput impedance, 47 kΩ, Nominal input level –10 dBV 
(–7.8 dBu)
CASSETTEOutput impedance, 100Ω, Output level –10 dBV  
(–7.8 dBu) (nominal), +10.8 dBV (+13 dBu) 
(maximum)
CD-RWOutput impedance, 100Ω, Output level –10 dBV  
(–7.8 dBu) (nominal), +10.8 dBV (+13 dBu) 
(maximum)
VCROutput impedance, 100Ω, Output level –10 dBV  
(–7.8 dBu) (nominal), +10.8 dBV (+13 dBu) 
(maximum)
Send (tip) Output impedance 100Ω, nominal level –10 dBV  
(–7.8 dBu), maximum level +15 dBV (+17.2 dBu)
Return (sleeve) Input impedance 10 k
Ω, nominal level –10 dBV  
(–7.8 dBu), 21 dB headroom
Input impedance 2.2 k
Ω
Input level –60 dBu  (GAIN 4at maximum) to –27 dBu 
(
GAIN at minimum)
Phantom power +48 V (global for 4 channels)
OL indicator 3Lights at 10 dB above nominal level
HPF Global for 4 channels, switchable @ 80 Hz