Toa W-912A Service Manual - Manual (Page 5)

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3. GENERAL DESCRIPTION
The TOA W-906A and W-912A In-Wall Mixer Power Amplifiers control and mix up to six independent input
signals plus two inputs with use of WE-2 Expanding kit. The W-906A delivers up to 60 W of output power and
the W-912A 120 W. Optional accessory modules are available for use with the W-906A and W-912A to
provide versatility for a wide range of operating applications. Edge connectors at the bottom of the front panel
permit the selection of the TOA plug-in modules. (Please contact your local TOA dealer for details on TOA
plug-in modules.)
The W-906A and W-912A have a built-in one-octave graphic equalizer with 9 bands to tailor sound system
frequency response to room acoustics, reducing feed-back 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
keeps it constant. Compressor's threshold level can be adjusted.
The speaker output terminals are designed to match 25 or 70 V line, or 4 or 8 Ω speaker systems.
User’s space (blank) is provided for loading the WE-2 Expanding kit (optional), enabling the number of inputs
to be increased by two. Protection against tampering is assured by means of a key-locked hinged door. The
W-906A and W-912A can be mounted in any four-inch wall with of the BX-9F Flush-mounting (in-wall) back
box. On-wall mounting is also possible with the BX-9S Surface-mounting (on-wall) back box.
4. FEATURES
• 6-channel mixer power amplifier
• Expandable to 8-input
• Output power: 120 W for W-912A, 60 W for W-906A
• Wide frequency response: 30 Hz to 20 kHz ±1dB
• Low distortion and noise
• Excellent output regulation
• Built-in one-octave equalizer
• Built-in compressor
• Self-protection circuitry design
• Separate output terminals: 4 and 8 Ω, 25 and 70 V
• Extra space for customizing
• LED peak indicator
• Full range of plug-in modules
• Flush and surface mounting
L'appareil ne doit pas être exposé aux éclaboussures ou écoulements et tous objets remplis de liquide, tels
que vases, ne doivent pas être sur l’appareil.
ATTENTION
The lighting flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user
to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of
sufficient magnitude to constitute a risk of electric shock to persons.