TOA W-906A UL, W-912A UL Users Manual

TOA 900 SERIES

(60-WATT)

IN-WALL AMPLIFIER

W-906A/912A

(120-WATT)

Features

1. 6-channel mixer power amplifier

2. Expandable to 8-input

3. Output power: 120W for W-912A, 60W for W-906A

4. Wide frequency response: 30 to 20,000Hz ±1dB

5. Low distortion and noise

6. Excellent output regulation

7. Built-in one-octave equalizer

8. Built-in compressor

9. Self-protection circuitry design

10. Separate output terminals: 4 and 8 ohms, 25 and
70 volts

11. Extra space for customizing

12. LED pilot light

13. LED peak indicator

14. Full range of plug-in modules

15. Flush and surface mounting

Description

The TOA W-906A and W-912A Mixer Power Amplifiers control
and mix up to six independent input signals plus two inputs
with use of an expanding kit WE-2. The W-906A delivers up to
60 watts of output power and the W-912A 120 watts. Twenty
one optional accessory modules are available to allow the
W-906A and W-912A amplifiers to be configured for a variety of
applications. Edge connectors on the rear of the units permit
TOA modules to be easily inserted for use.
Modules include the M Series microphone preamplifiers,
available with muting, remote volume control, voice gate and

compressor options. The U Series auxiliary preamplifiers,
available with muting, remote volume control and compressor
options. The B Series bridging transformers, available with
muting option, the L Series line matching transformers,
available with muting option, the S Series signal generator
modules and the I-01S Exes interface paging module. Also
available are the T-01S module featuring 600-ohm balanced
output capability and the T-02S module featuring auxiliary input
and balanced line output for music-on-hold.
For detailed module specifications, please refer to publication
TOA 900 Series Module Specifications, Features and
Connector Chart.
The W-906A and W-912A Mixer Power Amplifiers have a built-in
one-octave graphic equalizer with 9 bands to tailor sound
system frequency response to room acoustics, reducing
feedback tendencies and improving intelligibility. A built-in
compressor circuit is provided to protect the output level from
distortion as a result of excessive input and keep it constant.
The compressor’s threshold level can be adjusted. The W-906A
and W-912A Mixer Power Amplifiers have output terminals to
match 4- or 8-ohm speaker systems, or a speaker distribution
system may be connected to the 25 or 70-volt terminals. User’s
(blank) space is provided for additional functions to be made
by the customers. The expanding kit (optional) may be loaded
in this space when the number of inputs is increased.
Protection against tampering is assured by means of a key­locked hinged door. The W-906A and W-912A can be
mounted in any four-inch wall with use of the BX-9F Flush
Mounting Back Box. Wall mounting is also possible with use of

the BX-9S Surface Mounting Box.