Toa AX-1000A User manual

TOA ENGINEERED SOUND SYSTEM
AUTOMATIC MIXER
AX-1OOOA
DESCRIPTION
The TOA AX-1000A automatic microphone mixer is ideally master. This is accomplished by utilizing the Master/Slave
suited for applications such as churches, board rooms, switch on the rear panel. In addition to the main output, the
conference rooms or courtrooms, where multiple AX-1000A provides direct and logic outputs for each
microphones are in use.
Conventional mixers require an increase in total level as the
number of input connections increases. The room loop from
speakers to microphones not currently in use causes the
feedback margin to be lowered.
The US. patented Automatic Mixer Apparatus (U.S. Patent
No. 5148491) on The TOA AX-1000A compensates for each
input, thus doing away with unwanted noise and room loops.
The increase in total level is proportional to the number of
inputs, and attenuation takes place regardless of the input
quantity. This makes it possible to maintain maximum
feedback margin without having to rely on a specialist to
operate the system.
The AX-1000A is a modular eight-channel automatic micro-
phone mixer incorporating the technology required to gate
on, configured to shut out unnecessary sound, or to gate off
quietly, quickly and automatically.
The NOM (Number of Open Microphones) attenuation
control circuitry automatically adjusts gain level according to
the number of active inputs. This allows the system to
deliver maximum acoustic gain while preventing feedback.
Each of the AX-1000A’s eight input ports can accept any of
TOA’s 900 Series family of Microphone, Line Level,
Auxiliary, Bridging, Input/Output (except T-01) or Sound
Processing Modules. This allows the contractor or specify-
ing engineer ultimate flexibility in system design. Ten (10)
AX-1000A’s may be linked together to create a system with a
maximum of eighty (80) active input channels. When units
are in link mode, any mixer in the chain can operate as the
channel. The Logic Out is an open collector circuit that can
be utilized to trigger external devices.
The direct output can be used as an input for a logging
recorder to provide an account of the proceedings in a
courtroom communication system.
For flexibility and ease of set-up, each channel is provided
with input volume, threshold and off-attenuation controls.
The Threshold Level control adjusts the level at which the
input gates on. The Off-Attenuation control allows attenua-
tion of inactive inputs from 0 to -40dB. In addition, it allows
the adjustment necessary to assure smooth turn on without
any missed syllables.
The input remains on when the Off-Attenuation control is set
at 0dB.
To match virtually any type of application, the NOM attenua-
tion control permits adjustments between 0dB (functioning
as a standard mixer) and 20logNOM (6dB attenuation for
each additional active input). The center 10logNOM
position (3dB attenuation for each additional input) is the
standard automatic setting.
Other features include Muting, especially attractive in
conference systems where the chairman must override
other delegates, and a Master Remote Volume control
circuit.
The Off-Attenuation, Threshold and NOM-Attenuation
controls are protected by a security cover to prevent
unauthorized or unnecessary adjustments.
The AX-1000A includes the hardware necessary for
mounting in standard 19” equipment cabinets.

Front View
Input Volume Control Master Volume Control
Channel Controls:
Gate-On LED Master/Slave LED
THR OFF ATT NOM ATT Power Switch
and LED
Variable Threshold Each threshold control adjusts its channel’s detector, raising and lowering the
baseline sensitivity to an incoming signal. It determines how easily the input will
gate ‘on’. Threshold is independent of the Off-Attenuation setting.
Variable Off-Attenuation
This control, permitting continuous adjustment of a channel’s Off-Attenuation
(depth), operates from 0dB (full CW) to -40dB (full CCW). In the 0dB position, the
channel acts as a conventional mixer input. At that setting there is no attenuation
of the input whether it is above or below threshold.
Channel
output:
Relation of Threshold
and Off-Attenuation
Controls (simplified):
Channel
System Output Gain:
Adjustable NOM Attenuation
Automatic gain reduction is continuously variable from none to 20logNOMdB.
(NOM=‘Number of Open Mics’.) At the center detent, the attenuation of system
output gain follows the standard formula “10logNOM”. When the control is moved
clockwise, the attenuation is deeper, moving from 10logNOM to 12logNOM,
15logNOM, etc.
Attenuation is at a maximum fully clockwise, following the formula 20logNOM.
With the control set fully counterclockwise there is no system output gain attenua-
tion and the AX-1000A functions as a normal mic/line mixer. Between no attenua-
tion and the detent, output gain is attenuated more and more up to 10logNOM.
20logNOM
20logNOM
2
4
Active Inputs (NOM)
8
Inputs
0 dB Attn.
10 16 20 40
80
Inputs

Rear View
Remote Master
Volume Terminals
Logic Output Terminals
Module Direct-Output
Jacks (1/4”)
System Mute Terminals
(Priority Override) Channel Mute
DIP Switches
Modular Inputs
In a significant advance for automatic
mixing systems, the AX-1000A uses TOA’s
standard 900 Series input modules. Any
combination of Mic and Auxiliary Preamps
can be specified in an installation. If it is
important to allow for future expansion, only
a few of the input ports need be used.
Logic outputs, direct outputs, link in and
out, system mute terminals and remote
master volume control terminals are located
on the rear panel.
Function
Select
Link In
& Out
Master/
Slave Switch
SLAVE
Main Output Terminal
600 ohms or 150 ohms
System Mute
(Priority Override) A DIP switch determines which channels are muted when the two rear-panel mute
terminals are shorted by a relay or switch closure.
AX-1000A Internal Muting occurs within the mixer, after the signal has left the input
module itself. Thus, any 900 Series input module will be muted when the contacts
are closed. The module does not have to be a 900 Series ‘muting module,.
In fact, by using 900 Series muting modules, two levels of muting are possible.
The first level can be automated. It utilizes the Mute Send and Mute Receive
features of certain 900 Modules. The second level utilizes the Mute built
into the AX-1000A.
Direct Outputs
Each channel’s Direct Output provides a signal from the corresponding module.
It has been processed by the preamplifier and other circuitry in the module itself,
including, for example, compression in the case of the U-61 module. However,
the Direct Output signal is unaffected by the action of the AX-1000A’s gating,
muting, or gain-sharing circuits.
Logic Outputs
Each channel’s Logic Output is an open-collector circuit. The logic outputs may be
connected to relays for automatic initiation of events in an automatic zonal switching
system, triggering video camera controls, etc.
Link In and Out
When AX-1000A mixers are run in multiple, one of the mixers operates as the Master
and the rest operate as Slaves. The Master/Slave relationship is determined by the
rear-panel slide switch. The Master is connected to the Slaves using the Link In and
Out connectors. An optional Link cable is available.
Main Output The Main Output barrier strip can be configured for 150 ohms or 600 ohms operation
by moving the jumpers (provided).

900 Series Plug-In Modules Specifications & Selection Guide
Connector
Specifications
Max. Before Clip
into 10k ohms load Frequency
Noise Level
as less than 0.5% THD Response Equivalent Signal
Muting
(1kHz)
±1dB Input Noise
or S/N
Level
Remote Compress. Power
Control Range Requirement
Range [Threshold] [24V DC] Controls Weight
[Presettable] (Max.)
9mA
14mA
30mA
XLR-3-13
(F)*
M-01F
1-Low cut
1-High cut
1-Gain
3.88 oz.
2.82 oz.
3.17 oz.
-
-
27mA
3.88 oz. M-51F
33mA
1-Low cut
1-Sensitivity
1-Gain
1-Low cut
1-High cut
1-Threshold
1-Low cut
1-High cut
1-Gain
3.88 oz. M-61F
9mA 2.12 oz.
-
9mA 1-Gain 1.76 oz.
-
4mA
14mA
27mA
27mA
30mA
2.65 oz. U-01F
1-Gain
1.76 oz.
1.76 oz.
2.12 oz.
1.94 oz.
-
1-Mute level
1-Gain
-
-
1-Gain
-
38mA 1-input gain
1-Output gain
3.70 oz.
-
- -
3.17 oz.
3.35 oz.
3.17 oz.
3.35 oz.
B-01F
60dB 5mA - -
--
L-01 F
5mA
-
8.5mA 1-Sensitivity 3.35 oz.
15mA 1-Mute
1-Gain 3.53 oz.
35mA 1-Gain 3.53 oz.
7mA
11mA
1-Output
1.94 oz.
2.12 oz.
16mA 2.47 oz.
5P screw
Terminal (S)
-
-
M-21S
-
-
-
-
-
-
--
U-21s
-
T-02S
-
-
-
-
-
l-01S
-
-
-
-
Applications Module
11mA
Input Sensitivity
for Rated Output
(- 20dBv/100mV) Gain
1-Definition
1-Lo Contour
Source
Impedance
Balanced
200 ohms
Unbalanced
50k ohms
Unbalanced
50k ohms
Unbalanced
220k ohms
Unbalanced
10k ohms
Unbalanced
220k ohms
Output
Balanced
600 ohms
Balanced
10k ohms
Balanced
Types XLR-3-14 Phone Jack RCA Phono
(m)* (P)* Jack (R)*
M-01M M-01P
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
M-03P
-
U-01P
-
-
-
-
-
B-01P
-
L-01P
-
-
-
-
-
-
-
-
-
-
-
-
R-01R
U-01R
U-11R
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
60dB
6.3V (+ 16dBv)
Nominal - 60dBv (1.0mV)
- 126dBm,
Adjustable - 72 - - 52dBv
25 - 20,000Hz
200 ohms
(0.25 - 25mV)
terminated -
6.3V ( + 16dBv)
20 - 20,000Hz SIN 70dB
-
6.3V ( + 16dBv) RIAA
Equalized
SIN 70dB
-
-
6.3V ( + 16dBv)
20 - 20,000Hz S/N 90dB 60dB
Adjustable
0 - 60dB
-
-
20 - 20,000Hz S/N 90dB
20 - 20,000Hz S/N 90dB
-
6.3V ( + 16dBv)
-
6.3V ( + 16dBv)
4.7V (+ 13.4dBv)
into 600 ohms load
30 - 20,000Hz S/N 80dB
-
20 - 20,000Hz
-
-
-
20 - 20,000Hz -60dB
Balanced
Nominal 3.2V Nominal - 30dB
600 ohms
Adjustable 3.2 - 10V Adjustable - 30 - - 40dB
-
500 - 20,000Hz
-
Low-cut 250Hz
6.3V ( + 16dBv)
4.7V (+ 13.4dBv)
into 600 ohms load
30 - 20,000Hz S/N 80dB
- -
0.5V (- 6dBv) 0.5% THD
- -
1V peak to peak
--
1V peak to peak
S/N 80dB
20 - 20,000Hz
S/N 80dB
3P screw
Terminal (S)
M-01S
M-11S
-
M-51s
M-61S
-
-
U-01S
U-11S
U-12S
-
U-61S
-
B-01S
B-11S
L-01S
L-11S
L-41S
-
T-01S
S-01S
S-02S
S-03S
-M-01 series
Mute or Mute
M-11
Remote Volume Control facilities M-21
Voice Gate
M-51 series
Compressor M-61 series
Low Z
Gain Control
(except M-61)
Low-cut Filter
High-cut Filter
(except for M-51)
Phantom Power
0- -60dB -
Microphone
Preamplifier
Mag. Phono
Preamplifier
Auxiliary
Preamplifier
--
Auxiliary
Input Line
output
-20dB
Threshold
adjustable 0.5 - 5mV
Nominal - 50dBv (3.2mV)
Adjustable - 62 - - 42dBv
(0.8 - 8.0mV)
Nominal - 54dBv (2.0mV)
Adjustable - 54 - -46dBv
(2.0 - 5.0mV)
High Z, Gain
Control, Low-cut
and High-cut Filters -
M-03
Gain Control -
R-01
-U-01 series
Mute U-11 series
Variable Mute
U-12
4 oz. 2-RCA Phono (Input/Output)
Nominal - 20dBv (100mV)
Adjustable - 20 - + 10dBv
Nominal 0dB
(100 - 3,200mV)
Adjustable 0 - - 30dB
-
Gain Control
Remote Volume or Remote
Master Volume Control facilities
U-21
0- -60dB
-20dB
Threshold 1.0V
Rated output Nominal 0dB
0dBv (1.0V) Adjustable 0 - - 30dB
Compressor
U-61
Nominal - 20dBv (100mV)
Adjustable - 20 - 0dBv
Nominal 0dB
(100 - 1,000mV)
Adjustable 0 - - 20dB
AUX
Output Gain Control
Input Gain Control
T-02
LINE
OUT
Nominal 20dB
Rated output 0dBv (1.0V) (1.0
- 158mV output)
B-01 series
Bridging
Transformer
-
- 18dBv (125mV) - 1dB
Mute
Mute
-
B-11 series
L-01 series
L-11
-18dBv (125mV)
- 2dB
Line
Matching
Transformer
600 ohms
Sensitivity Control Signal Activated Mute
L-41
Gain Control
Mute Delay Control
-
l-01 Paging Input
-Nominal 20dB
(1.0V output)
Adjustable 20 - 4dB
(1.0V - 158mV)
-
T-01
Output
Balanced
600 ohms
1 kHz Sine Wave S-01
-
Buzzer/Yelp S-02
-
Line Output
Gain Control
Tone Signal
Generator
Gain Control
One Tone Chime/
Continuous Chime S-03 -
BBE Sound
Processing
Module
No Connection to
Mix Buss
Definition, Low
Contour, On-Off
lncreased Intelligibility, Paging, F-01R 47k ohms
N/A
APPEARANCE AND DIMENSIONAL DIAGRAM
Module Application Note
l-01S Designed for interface with TOA EXES intercom systems.
L-41S Must occupy port No. 2 when used in conjunction with A-901A.
M Series Phantom power is defeatable by cutting jumper J-l on the module.
T-O1S
Will not function in the A-901A. Functions only in ports No.s 5 and 6 when
used with the following models: M-900A, A-903A, A-906A, A-912A, W-906A
and W-912A.
U-61S Can
and when used between the pre-amplifierfunction as a master compressor
power amplifier sections.
With W-906A and W-912A in-wall amplifiers use screw terminal modules only.

SPECIFICATIONS
Frequency Response 20Hz to 20kHz ± 1 dB
Total Harmonic Distortion Less than 0.1%, at 1 kHz signal input
Signal to Noise Ratio Better than 90dB, with all Vol. Min.
Better than 77dB, with Band Pass 20Hz to 20kHz,
Input Vol. Min., Master Vol. Max.
Inputs 8 x Input port for TOA 900 Series modules
1 x Link In (stacking)
Input Sensitivity and Input ports: 100mV, 10k ohms
Impedance
Link In: 100mV, 10k ohms Audio Signal
outputs
1 x Main output: 600 ohms/150 ohms, balanced,
transformer isolated
Controls
8 x Direct outputs: 680 ohms; Nominal -20dBV
(100mV); Maximum +16dBV (6.3V)
1 x Link out: 100mV, 1k ohms
8 x Logic out: isolated open collector (30mA,
24V DC max.)
8 x Input volume
1 x Master volume
8 x Threshold controls
1 x NOM Attenuation control
8 x Off-Attenuation controls
1 x Master/Slave switch
1 x set of 8 Channel Mute DIP switches
1 x INT/EXT Mute Function Select switch
Number of Max. Stacking
10 units (80 channels)
Max. Attenuation Level 20dB per AX-1000A
-Attenuation System 10logNOM (Number of Open Mics) typical
(Continuous adjustable from 0dB to
20logNOMdB)
Line Voltage AC mains
Fuse 05A, 250V, fast blow
fuses not user accessible: see service
manual
Dimensions
16.5 (W) x 6.0 (H) x 12.9 (D) inches
420 (W) x 151.3 (H) x 327.5 (D) mm
19” rack-mountable, 3 EIA rack units
Weight 15.5lbs. (7.0kg)
*Specifications are subject to change without notice.
BLOCK DIAGRAM
Architect’s and Engineer’s Specifications
The automatic microphone mixer shall have eight input ports and shall
be capable of accepting a full complement of TOA 900 Series Micro-
phone, Line Level, Auxiliary, Bridging, Input/Output (except T-01) and
Sound Processing Input Modules. The automatic mixer shall incorporate
a continuously variable, adjustable NOM-Attenuation control (with a
range from 0logNOM to 20logNOM with a center detent at 10logNOM)
to allow precise adjustment of automatic mixing circuitry to the acousti-
cal environment of the facility in which the device shall be utilized.
For flexibility and ease of set-up, each channel shall be provided with
Input Volume, Threshold Level and Off-Attenuation controls. The Threshold
Level control shall adjust the level at which the input gates on. The Off-
Attenuation control shall be continuously variable and shall allow attenuation
of an inactive input from 0 to -40dB. The Off-Attenuation setting shall
not affect the channel gating, ensuring smooth turn-on without any
missed syllables. The Input Volume, Threshold Level, Off-Attenuation,
and NOM-Attenuation controls shall be front-panel mounted for ease of
set-up. A security cover shall be provided to protect the Off-Attenuation,
Threshold and NOM-Attenuation controls from unauthorized use.
Each input channel shall incorporate a front panel LED to visually
indicate the gating function. A link Input/Output shall be provided
allowing up to ten (10) devices together to create a system with a
maximum of eighty (80) input channels.
A rear panel Master/Slave switch shall be provided to allow any unit to
function as a Master or Slave unit when multiple units are incorporated
into a sound reinforcement system. A front panel LED shall visually
indicate the position of the Master/Slave switch.
The automatic mixer shall incorporate logic outputs for each channel.
The Logic Out shall be an open collector circuit that can be utilized to
trigger external devices. The automatic mixer shall provide direct
outputs for each channel, providing a buffered audio signal from the
corresponding input module.
The direct output shall only be affected by the circuitry within the input
module; it shall not be affected by the mixer’s gating, muting or gain-
sharing circuits. The direct outputs shall be capable of being passively
mixed. Dip switch selectable muting shall be provided to allow a
“chairman override” function for any combination of channels. Muting
shall be accomplished by shorting the rear panel mute terminals via a
switch closure or relay contact.
By utilizing TOA 900 Series Muting Input Modules it shall be possible to
provide two levels of muting. Rear panel Remote Master Volume
terminals shall be provided, the maximum gain of which shall be limited
by the front panel master volume control setting. Control shall be via a
10k linear potentiometer.
The unit shall measure 19.0”(W) x 5.22”(H) x 11.8”(D) (483mm x 133mm
x 300mm) with rack-mount hardware attached, shall have an aluminum
anodized front panel and shall weight 15.5lbs (7.0kg). With standard
rack mount hardware the unit shall require 3 EIA Rack Units. The
modular eight (8) channel automatic mixer shall be a TOA Model
AX-1000A.
TOA Corporation
Printed in Japan (407) 833-62-087-1A