Toa AT-025, AT-100, AT-100EMG, AT-10K Installation Manual
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INSTALLATION MANUAL
VOLUME CONTROL ATTENUATOR
AT-025
AT-100
AT-100EMG
1. GENERAL DESCRIPTION
TOA’s volume control attenuators provide precise level adjustment of single or multiple speaker lines. They’re available
in 25W, or 100W models with a Decora-style wall plate. AT-100EMG is equipped with a 24VDC@15mA relay for
applications that require emergency and paging signals to bypass/override the attenuator. AT-10K is a 10k ohm linear
taper control for single-point remote level adjustment of voltage controlled amplifiers such as TOA’s M-900MK2,
A-900MK2, M-9000M2, A-9000M2, A-700, BG-2000, BA-200, AV-20D series mixers/amplifiers.
2. WIRING DIAGRAMS
AT-025 / AT-100
Speaker line
(25V, 75V, or 100V)
from amplifier
INPUT
OUTPUT
To speaker(s) with transformer(s)
(25V, 75V, or 100V)
INPUT
Speaker line
from amplifie
AT-100EMG
Speaker line
(25V, 75V, or 100V)
from amplifier
INPUT
OUTPUT
To speaker(s) with transformer(s)
To switched 24VDC source
(class 2 wiring)
INPUT
Speaker line
(25V, 75V, or 100V)
from amplifier
AT-10K
Schematic Diagra
IN CTRL COM
10Kohm Linear Taper Potentiometer
Typical Hook-up
IN
CTRL
COM
+V Output
Control Input
Gnd, Com, or
AT-10K
OUTPUT
To speaker(s)
with transformer(s)
OUTPUT
To speaker(s)
with transformer(s)
Amplifier /
VCA Module
TOA Canada Corporation
3. SPECIFICATIONS
Model AT-25 AT-100 AT-100EMG AT-10K
Input Capacity 25W 100W 100W Attenuation 13 steps (0dB, -3dB, -6dB, -9dB, -12dB, -15dB, -18dB,
-21dB, -24dB, -27dB, -30dB, -33dB, OFF)
Wire Capacity 14-gauge
Priority Relay - - 24VDC@15mA Finish White plate & sub-plate / Decora-style
Dimensions Plate Width 2.75”
Plate Height 4.5”
A: 1.75”
B: 2.5”
C: 1.875”
Plate Width 2.75”
Plate Height 4.5”
A: 1.812”
B: 2.5”
C: 1.875”
Plate Width 2.75”
Plate Height 4.5”
A: 2.125”
B: 2.5”
C: 1.875”
Continuous
10kΩ
Plate Width 2.75”
Plate Height 4.5”
(see below drawing)
AT-025 / AT-100 / AT-100EMG
1.25”
AT-10K
1.0”
1.75”
TOA Canada Corporation
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