Tascam Powered Mixer Av-452 Installation And Support Guide

							
IEEE 1394 Interface
Powered Mixer
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 exclamation point with in an equilateral triangle is inte nded to alert the user to the pres-
ence of important operating a nd maintenance (servicing) instructions in the literature 
accompanying  the  appliance.
The lightning flash with 
arrowhead symbol, within  an equilateral triangle, is intended to alert 
the user to the presence of uninsulated “dange rous voltage” within the product’s enclosure 
that may be of sufficient magnitude to cons titute a risk of electric shock to persons.
This appliance has a serial number 
located on the rear panel. Please record 
the model number and serial number 
and retain them for your records.
Model number
Serial number
Ü
ÿ
Ÿ
WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS 
APPLIANCE TO RAIN OR MOISTURE.
INSTALLATION & SUPPORT GUIDE
D00788500B 
						

							
2  TASCAM AV-452 Installation & Support Guide
IMPORTANT SAFETY INSTRUCTIONS
1Read these instructions.
2 Keep these instructions.
3 Head all warnings.
4 Follow all instructions.
5 Do not use this apparatus near water.
6 Clean only with dry cloth.
7 Do not block any ventilatio n openings. Install in 
accordance with the manufacturer’s instructions.
8 Do not install near any h eat sources such as radi-
ators, heat registers, st oves, or other apparatus 
(including amplifiers) that produce heat.
9 Do not defeat the safety purpose of the polarized 
or grounding-type plug. A polarized plug has 
two blades with one wider than the other. 
Grounding type plug has two blades and a third 
grounding prong. The wide blade or the third 
prong are provided for your safety. If the pro-
vided plug does not fit  into your outlet, consult 
an electrician for replacement of the obsolete 
outlet.
10 Protect the power cord from being walked on or 
pinched, particularly at plugs, convenience 
receptacles, and the point where they exit from 
the apparatus.
11 Only use attachments/accessories specified by 
the manufacturer. 12
Use only with the cart, stand, tripod, bracket, or 
table specified by the manufacturer or sold with 
the apparatus. When a cart is used, use caution 
when moving the cart/appa ratus combination to 
avoid injury from tip-over.
13 Unplug this apparatus during lightning storms or 
when unused for long periods of time. 
14 Refer all serving to qualif ied service personnel. 
Servicing is required when the apparatus has 
been damaged in any way, such as power-supply 
cord or plug is damaged, liquid has been spilled 
or objects have fallen into the apparatus, the 
apparatus has been exposed to rain or moisture, 
does not operate normally, or has been dropped.
●Do not expose this apparatus to drips or 
splashes.
●Do not place any objects filled with liquids, such 
as vases, on the apparatus.
●Do not install this appara tus in a confined space 
such as a book case or similar unit.
●The apparatus draws nominal non-operating 
power from the AC outlet with its POWER 
switch in the off position. 
						

							
  TASCAM AV-452 Installation & Support Guide 3
TO THE USER
This equipment has been tested and found to 
comply with the limits for  a Class A digital device, 
pursuant to Part 15 of the FCC Rules. These 
limits are designed to provide reasonable 
protection against harmful interference when the 
equipment is operated in a commercial 
environment. This equipment generates, uses, 
and can radiate radio frequency energy and, if 
not installed and used in accordance with the 
instruction manual, may cause harmful 
interference to radio communications.
Operation of this equipment in a residental area 
is likely to cause harmful interference in which 
case the user will be re quired to correct the 
interference at his own expense.
CAUTION
Changes or modifications to this equipment not 
expressly approved by TEAC CORPORATION 
for compliance could void the user’s authority to 
operate this equipment.
For the consumers in Europe
WARNING
This is a Class A product. In a domestic environment, 
this product may cause radio interference in which 
case the user may be required to take adequate 
measures.
Pour les utilisateurs en Europe
AVERTISSEMENT
Il s’agit d’un produit de Classe A. Dans un environne-
ment domestique, cet appa reil peut provoquer des in-
terférences radio, dans ce  cas l’utilisateur peut être 
amené à prendre des mesures appropriées.
Für Kunden in Europa
Warnung
Dies is eine Einrichtung,  welche die Funk-Entstörung 
nach Klasse A besitzt. Diese Einrichtung kann im 
Wohnbereich Funkstörungen versursachen ; in die-
sem Fall kann vom Betrieber verlang werden, ange-
messene Maßnahmen durchzuführen und dafür 
aufzukommen.
  For U.S.A
IMPORTANT SAFETY PRECAUTIONS
IMPORTANT (for U.K. Customers)
DO NOT cut off the mains plug from this equipment.
If the plug fitted is not suitable for the power points in your home 
or the cable is too short to reach a power point, then obtain an 
appropriate safety approved extens ion lead or consult your dealer.
If nonetheless the mains plug is cut off, remove the fuse
 and 
dispose of the plug
 immediately, to avoid  a possible shock hazard 
by inadvertent connection to the mains supply.
If this product is not provided with  a mains plug, or one has to be 
fitted, then follow the instructions given below:
IMPORTANT:  The wires in this mains lead are coloured in 
accordance with the following code:
GREEN-AND-YELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE
WARNING:  This apparatus must be earthed.
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 
E or by the safety earth symbol  ç or coloured GREEN or 
GREEN-and-YELLOW.
The wire which is coloured BLUE must be connected to the 
terminal which is marked with the letter N or coloured BLACK.
The wire which is coloured BR OWN must be connected to the 
terminal which is marked with the letter L or coloured RED.
When replacing the fuse only a  correctly rated approved type 
should be used and be sure  to re-fit the fuse cover.
IF IN DOUBT — CONSULT A COMPETENT ELECTRICIAN. 
						

							
Table of Contents
4 TASCAM AV-452 Installation & Support Guide
1 – Introduction
“AV installation” features ......................................................................5
About this manual ..................................................................................5
How the manual is organized ................................................................6
2 – General installation notes
Physical installation ................................................................................7
Power supply ...........................................................................................7
3 – Front panel features
Microphone channels..............................................................................8
AV control and selection section ................................................................... 8
Main control section ...............................................................................9
4 – Remote control unit features
Learning command codes .......................................................................11
5 – Rear panel connections
Video connections ...................................................................................12
AV audio and microphone connections ................................................13
“Master” audio connections ...................................................................14
External control connectors ...................................................................15
6 – Customization and settings
LEARN IR (switch 1) ........................................................................................ 16
CASCADE (switch 2)........................................................................................ 17
SPEAKER OUT (switch 3) ................................................................................ 17
MIC HPF (switch 4) .......................................................................................... 17
INTERCOM GATE (switch 5) ........................................................................... 17
AV DUCKER (switch 6) .................................................................................... 17
7 – External control
AV-452 serial protocol ............................................................................18
Serial port pinouts .......................................................................................... 18
Relay control port ...................................................................................19
IR “blaster” ...................................................................................................... 19
RELAY CONTROL pinouts ............................................................................... 19
8 – Specifications and block diagram
Video specifications ................................................................................20
AV audio and microphone specifications ..............................................20
Master section specific ations .................................................................21
Audio performance .................................................................................21
Power and physical specifications .........................................................22
Dimensional drawing..............................................................................22
Block diagram ..........................................................................................23 
						

							
 TASCAM AV-452 Installation & Support Guide 5
1 – Introduction
The TASCAM AV-452 coordinates the audio/visual 
needs for presenters of all levels.  Functionally, the 
AV-452 serves as a microphone mixer, A/V receiver, 
and power amplifier into one compact unit.  The con-
trol surface is elegant and intuitive.
Audio: Four microphone inputs (with phantom 
power) offer plenty of inputs for multiple presenters, 
or multiple speaking positions. Up to two audio and 
three audio/visual components can be connected to 
the A/V channel, with simp le switching control.  A 
3-band EQ is available on each channel to enhance 
the individual sounds as needed.
Video: The AV-452 will perform video switching 
between three A/V components, offering a single 
video feed for projectors or  monitors with limited in- puts. Switching is done in
 parallel, and video switch-
ing is handled for composite and S-Video inputs.
Control: The RC-452 universal  learning remote is 
included with the AV-452, allowing the presenter to 
operate all the key equipmen t with a single remote.  
The RC-452 will control the AV-452, and can learn 
commands for projector power, and transport com-
mands for up to four components.
The AV-452 itself also can learn IR commands, to in-
tegrate projector/monitor switching with the AV-452 
internal switching.  This IR command set can be 
transmitted with an IR “blast er” (not included) to the 
37-pin ‘D’-sub 
RELAY CONTROL port (see Relay 
control port on page 18 for details).
“AV installation” features
Special additional features of the AV-452 relevant to 
fixed installation: 
 Microphones can be connected using either XLR-
type connectors or using a barrier strip and can be 
phantom powered, allowing the use of miniature 
condenser or PZM (boundary field) microphones. 
 Switchable 80 Hz bass ro ll-off to eliminate low-
frequency rumble.
 Microphone insert loop for parametric EQ, com- presser/limiter/gate, etc. 
 AV signal dimmer to allow manual voiceovers, etc. 
 Automatic AV ducker with adjustable ratio and  threshold settings. 
 A CV (constant voltage) paging system can be con- nected (12V, 24V or 70V) to the rear panel.  A level  control and defeatable noise gate are provided for 
optimal settings.
 A building alarm system can be connected to the  EMG input.  When the al arm sounds, the AV-452 
will mute local audio, and switch the CV paging 
input on.
 The speaker and line output have independent  mono switches for use in single-zone or multi-zone 
systems.
 Cascade input can be c onfigured to combine the 
input as a submixer, or operate as room cascade, 
allowing the AV-452 to become a drone amp.
 Dedicated unbalanced 
MEETING OUT jacks, 
together with balanced 
LINE OUT jacks allow for 
connection with other equipment. 
 Serial (RS-232) and relay (37-pin D-sub) connec- tors allow for control of the unit by other devices. 
About this manual
This manual is intended for use by those designing, 
installing and supporting the AV system including 
the AV-452. It is not necessary for the everyday user 
of the equipment to read this manual.
The user should refer  to the single-sheet Operation 
Guide  for a quick reference  on how to operate the 
unit. However, a brief guide to the front panel, and 
remote control unit is given here, and this also pro-
vides some information whic h can be used when in-
troducing the operation of the unit to its users.
We suggest that the  Operation Guide is kept close to 
the AV-452, and the spaces on  this sheet are filled in, for a written record of th
e permanent connections 
made between the AV-452 and other equipment.
Note that controls and connectors on the unit and the 
remote control unit are wr itten in this typeface: 
LINE 
OUTPUT
. Sometimes a control  or connector is re-
ferred to by a number, corresponding to the numbers 
in the diagrams Front panel features on page 8, 
Remote control unit features on page 10 and Rear 
panel connections on page 12. In these cases, a fea-
ture of the main unit is numbered like this: 
1, and a 
feature of the remote control unit like this: 
2.
Controls and connectors on other units are written in 
this way:  REC IN. 
						

							
1 – Introduction
6 TASCAM AV-452 Installation & Support Guide
How the manual is organized
The different sections of the manual are as follows:
1, “Introduction” (page 5) This introduction 
to the AV-452.
2, “General installa tion notes” (page 7) 
As the title suggests, this  includes general notes on 
the physical and electrical installation requirements 
for the AV-452.
3, “Front panel features” (page 8) As well 
as a list of the front panel controls and features, this 
section provides details on  the operation of the AV-
452. Read this section to  obtain an overview of the 
way in which the AV-452 works.
4, “Remote control  unit features” (page 
10) 
This provides a list of the features and functions 
available using the RC-452  remote control unit, as 
well as details on how to  program the RC-452 to 
learn and replay the command codes of other units.
5, “Rear panel conne ctions” (page 12) 
This lists the connections  to and from the AV-452.
6, “Customization and settings” (page 
16) 
The AV-452 can be customized for the individ-
ual installations in a number of ways, using the rear 
panel switches, etc. This s ection describes the way in 
which this customization can  be carried out, includ-
ing the way in which the  AV-452 can learn the IR 
codes necessary to control external devices.
7, “External control” (page 18) The AV-452 
can be controlled by an exte rnal serial controller, and 
this section lists the cont rol codes available for con-
trol, status, and query. Additionally, relay control and 
tally indicator connectors  are provided. Details of 
these are given in this section.
8, “Specifications  and block diagram” 
(page 20) 
Performance figures, dimensional draw-
ings and a block diagram of the AV-452. 
						

							
 TASCAM AV-452 Installation & Support Guide 7
2 – General installation notes
These notes provide you with information about the 
installation of the AV-452.
The packing should contai n (in addition to this 
manual):
The  User’s Guide —a single sheet containing oper-
ating instructions
 A power cord with a 3-pin plug suitable for your  region  A rack mounting kit consisting of four screws and 
four washers
 The RC-452 remote control unit
 Two AAA batteries for use in the RC-452 remote  control unit
 Warranty card
Contact your TASCAM dealer or distributor if any of 
these items is missing.
Physical installation
The unit can be fitted in any standard 19 rack, using 
the mounting kit (screws an d washers) provided. No 
rear support is needed.
3U of rack space is required for the unit itself. Since 
the AV-452 incorporates power amplifiers, it is 
strongly recommended that  at least 1U of space is 
left above the unit to avoid overheating.
NOTE
Do not install this apparatus  in a confined space such as 
a book case or similar unit.
For the same reason, adeq uate space for ventilation 
should be left at the front and rear of the unit. In any 
case, the space at the rear  of the unit should be suffi-
cient to accommodate the audio and video connec-
tors plugged into the AV-452.
Since many of the functions of the unit are set using 
small preset controls (trimmer pots, DIP switches, 
etc.) on the rear panel, we  suggest that you ensure 
you have clear visual access to the rear panel, or that 
you make these settings befo re final installation in 
the rack.
Power supply
The AV-452 can use an AC power supply as marked 
on the rear panel. Do not use any other voltage of 
power supply, as this may result in damage.
The unit should be properly grounded (earthed). The power switch is located on the rear panel to pre-
vent the user from accidentally turning power off 
during a presentation.  If yo
u want to turn the system 
on and off routinely, you may consider using a power 
switch for the outlets, or  using a centrally-switched 
power distribution system. 
						

							
8 TASCAM AV-452 Installation & Support Guide
3 – Front panel features
A brief guide to the front panel features of the AV-
452, with a little more technical detail than in the  Op-
eration Guide . It can be used as a quick 
reference guide for everyday 
operation, or to form the ba sis for an introductory ex-
planation to the users of the equipment.
Microphone channels
Each of the four microphone  channels is identically 
equipped.1 MUTE key This latching key  lights when the 
mic input channel is muted.
2 Fader The unity gain for this fader is at the 7 
mark. 
3 OL indicator Lights at 10 dB above the nom-
inal clipping level.
4 GAIN control Provides 33 dB of control to 
adjust the mic level appropriately.
5 EQ section 3 bands, each providing ±10 dB 
at the following frequencies (optimized for voice):
HI: 8 kHz (shelving)  
MID: 2.5 kHz (peaking)  
LO: 250 Hz (shelving)
AV control and se lection section 
This section is used to  select the appropriate AV 
source, and control the sound.
6 DIM key This latching key is used to attenuate 
the AV source signal by 20 dB. It lights when dim-
ming is active.
7 Fader The unity gain for this fader, which is 
used to control the level of the selected AV signal, is 
at the maximum level. 
8 REC MONITOR control/indicator De-
spite the name, this cont rol and indicator acts a 
record source selector.
In the 
SOURCE position, the output of the signal 
selected using the AV selector keys is fed to the  inputs of all connecte
d equipment (except the 
source unit, to avoid signal loops). For example, if 
the cassette is selected, the  cassette output is fed to 
the CD-RW and VCR inputs . The indicator lights.
In the 
CASS position, the cassette output is fed to 
the CD-RW and VCR inputs, regardless of the AV 
selector keys.
In the 
CD-RW position, the CD-RW output is fed to 
the cassette and VCR inputs,  regardless of the AV 
selector keys.
9 EQ section 3 bands, each providing ±10 dB 
at the following frequencies:
HI: 12 kHz (shelving)  
MID: 2.5 kHz (peaking)  
LO: 100 Hz (shelving)
AAV source selector keys Only one of 
these latching keys can be active (lit) at a time. Used 
to select the AV source.
NOTE
If the REC MONITOR selection and the selection here 
are the same, the source output is muted, to avoid a 
feedback loop.
Also note that if an audio-on ly source has been selected 
(
CASSETTE, CD-RW or AUX I N on the AUDIO 
ONLY
 setting), the last-selecte d video source will be 
output through the video connectors.
1
2
3
4
5
89 A B
6
7 
						

							
3 – Front panel features
 TASCAM AV-452 Installation & Support Guide 9
BVideo input selector keys Only one of 
these latching keys (
RGB 1 and RGB 2) can be active 
(lit) at a time. They are used to select the input source 
for an external projector.
NOTE
These RGB 1 and RGB 2 keys do not affect the switch-
ing of the composite video or S-Video outputs con-
nected to the AV-452. They allow centralized control of 
a projector or display forming part of the AV system 
containing the AV-452. See LEARN IR (switch 1) on 
page 16 for details.
Main control section
This section contains controls related to the overall 
system.
C ROOM VOLUME control This is used to 
adjust the levels from the speaker outputs as well as 
from the line level outputs. The indicator on this con-
trol lights when power is supplied to the AV-452.
It is motorized, meaning th at it will reflect changes 
made from the RC-452 remote control unit (
E).
D AUX inputs This set of three RCA jacks is 
used to connect a composite video signal and/or the 
left and right components of a stereo audio signal.
E AUX selector switch This determines 
whether audio and video are  enabled together at the 
AU X jacks (switch pushed in), or audio only (switch 
in the out position).
F CASCADE key When this key is active (lit), 
the input to the 
CASCADE inputs (rear panel) is fed 
to the stereo bus (pre-
ROOM VOLUME). A rear panel 
switch determines whether  this input replaces the 
input signals or is summed  with them (see (CAS-
CADE (switch 2) on page 17).
G INTERCOM key When this key is lit, the 
signal received at the 
INTERCOM connection on the  rear panel is fed to the ster
eo bus. This signal is not 
affected by the 
ROOM VOLUME control.
H IR SENSOR This window is used to receive 
the commands from the supplied wireless remote 
control unit.
I AMP A and AMP B keys The AV-452 can 
operate in mono mode, with  each amplifier driving a 
separate speaker, in which case, these will act as 
room control keys.
Alternatively, it can be operated in stereo mode, in 
which case, these keys turn the stereo channels on 
and off individually.
NOTE
These keys do not turn the amplifiers on and off—they 
simply mute the signal to the speakers.
The mono/stereo setting for  the line outputs is made 
using the dedicated switch on the rear panel 
e and 
for the speaker outputs using the DIP switches 
i.
J PHONES level and jack Connect a stan-
dard pair of stereo head phones to this 1/4 jack. 
Adjust the volume with the 
PHONES level control 
(pre-
ROOM CONTROL).
NOTE
Remove the headphones fro m the jack when turning 
the AV-452 on or off, to avoid possible damage from 
“thumps”. 
K RGB 2 input Connect one end of a VGA 
standard 15-pin D-sub (analog) cable to this connec-
tor and the other end to a personal computer. The 
signal is passed through to the 
RGB 2 THRU connec-
tor on the rear panel.
NOTE
The AV-452 is not provided  with an “RGB 1” input or 
output. This numbering syste m refers to any projector 
or video display unit connected to the AV-452.
C FG H I J K
D
E 
						

							
10 TASCAM AV-452 Installation & Support Guide
4 – Remote control unit features
The RC-452 remote control unit is designed for con-
trol of not only the AV-452 , but up to four additional 
connected units (marked as 
CASSETTE, VCR, CD-
RW
 and DVD).
A total of 36 keys in total can be programmed (as de-
scribed later in this section).
When using the RC-452 with the AV-452 or any 
other unit, make sure:
 There is a clear unobst ructed path between the 
remote control unit and th e remote sensor on the 
unit being controlled.
 The remote control unit is located within 5 m  (15 ft.) of the unit being  controlled, and is pointing 
at approximately right angles (±30°) to the front 
panel.
The RC-452 should be main tained in the same way 
as a consumer control unit. When changing the 
batteries:
 Always make sure that both batteries are replaced  together. Do not mix old and new batteries.
 Do not mix batteries of different types.
 Always make sure that the batteries are located  with the correct polarity (the positive terminals of 
the batteries should match the 
+ markings inside 
the battery compartment,  and the negative termi-
nals should match the 
– markings).
 If you are not going to us e the remote control unit 
for an extended period of time, remove the batter-
ies. Old batteries can l eak, casing damage to the 
remote control unit.
 Always dispose of used ba tteries in the way recom-
mended by your local ga rbage disposal authorities.
NOTE
The CASSETTE and CD-RW keys of the RC-452 are 
programmed at the factory to control the TASCAM CC-
222 unit. However, they may  be programmed to control 
other units. The names of these keys and other keys 
which may be programmed are enclosed [in brackets] in 
the list below. See Learn ing command codes on 
page 11 for details of how to do learn other units’ com-
mands
When the batteries are changed in the RC-452, the pro-
grammed codes are typically retained. However, you  should note that if the ba
tteries are removed for an 
extended period of time, da ta loss will occur, and the 
codes must then be re-learned.
1 SET key and indicator Used when learn-
ing commands for other units (as described below)
2 [TV/PROJECTOR power keys] One 
programmable key (
ON) is used to put the TV or pro-
jector on, and the other (
OFF/STD-BY) is used to put 
it into standby or off mode.
3 AMP A and AMB B keys These keys du-
plicate the function of the 
AMP keys on the AV-452 
(
I).
4 AV selector keys These keys duplicate the 
function of the audio and video keys on the AV-452 
(
A and B).
5 MUTE keys These keys duplicate the func-
tion of the microphone 
MUTE keys on the AV-452 
(
1).
6 [CASSETTE keys] Use these programma-
ble keys to control a casse tte deck (pre-programmed 
for the TASCAM CC-222 when the unit is shipped).
7 [VCR keys] Use these programmable keys to 
control a videocassette recorder.
8 [CD-RW keys] Use these programmable 
keys to control a CD recorder (pre-programmed to 
control the TASCAM CC-222 when the unit is 
shipped)
12
A
B
C
9
D
E
3
4
5
7 6
8