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TOA Electronics W-906A manual

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Table of contents for the manual

  • Page 1

    OPERA TING INSTR UCTIONS NEW 900 SERIES IN-W ALL MIXER PO WER AMPLIFIER W -906A W -912A INPUT 1 POWER ON 250V 3A 250V 6A OFF OFF MAX INPUT 2 INPUT 3 AC FUSE OFF ON LOW PASS OFF ON HIGH PASS OUT 63 125 250 500 1k 2k 4k 8 k 16k 63 125 250 500 1k 2k 4k 8 k 16k IN EQUALIZER OUTPUT FUSE COMPRESSOR INPUT 4 INPUT 5 INPUT 6 MASTER 12 6 0 6 12 12 6 0 6 12 9[...]

  • Page 2

    2 1. GENERAL 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 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 ra[...]

  • Page 3

    3 3. NOMENCLA TURE AND FUNCTIONS [Front] 1. Power switch Applies line power. Two-position push button switch for on-off modes. 2. Input volume controls Adjust gain of input 1 – 6 respectively. 3. Master volume controls Adjust overall gain of unit. 4. Modules (optional) Select appropriate modules according to the application. 5. Compressor control[...]

  • Page 4

    4 [Front] (vie w ed with the front cov er remo v ed) 17. AC power cord Connects to power source. 18. Speaker output terminals Connects to speakers. 19. Output terminals Select output impedance with this terminal. 20. Low-cut switch Cuts off unnecessary low frequency. 21. Module input ports Accept PLUG-IN MODULES which are optionally available. Modu[...]

  • Page 5

    4. INST ALLA TION AND CONNECTION Installing this amplifier requires the optional back box, which is Model BX-9F for flush mounting in any 4 inch wall and Model BX-9S for surface mounting. Fix the back box first in installing the amplifier... Installing Procedure Step 1. Attach hinges to the back box by means of screws. (The hinges and screws are ac[...]

  • Page 6

    Step 6. Fixing the amplifier Fix the amplifier to the back box with screws after connecting the power cable and the speaker cable. Step 7. Selecting output impedance Select appropriate output impedance that matches the speaker to be used. Class 2 wiring may be used. Since these outputs consist of 8 Ω , 25 V and 70 V via the output transformer (ma[...]

  • Page 7

    7 Step 8. Input connections • This unit has six INPUT PORTS for plug-in modules. Select the desired modules for each application. • Plug the modules into INPUT PORTS, sliding them between the guide rails, and secure each with two screws. • When not all INPUT PORTS are occupied, cover the vacant PORTS with back panels, and secure them with scr[...]

  • Page 8

    8 Input Expander The optional expanding kit (WE-2) is necessary to increase the number of input. Up to two inputs may be added by loading the expanding kit in the user's space. For details, refer to the instruction manual of the kit. Note When the temperature of heat sink exceeds 105 ° C, the protection circuit is activated and the output is [...]

  • Page 9

    Compressor If the COMPRESSOR CONTROL switch is set to OFF, it bypasses the compressor circuit. Turn it clockwise to activate the compressor and to adjust the limiting level. Since turing it fully clockwise far too much limits the output level, set the switch at a maximum point that does not cause the peak indicator to light up. Adjusting release ti[...]

  • Page 10

    10 9. BLOCK DIA GRAM 8. OUTPUT EQ CHARA CTERISTIC 1 A 2 B High-pass filter (180 Hz, 12 dB/Oct.) Low-pass filter (7 kHz, 12 dB/Oct.) Equalizer Out Compressor (Limiter) Control Release Time Equarizer Control 63 Hz – 16 kHz Bridging In/Out – 20 dBV, 3.3 kHz 0 dBV = 1 V = approx. 2 dBm Mute Compressor (Limiter) off Thermostat 105 ° C OT PT Power A[...]

  • Page 11

    11 10. SPECIFICA TIONS Model No. Type Output Power Power Bandwidth Frequency Response Total Harmonic Distortion Inputs Input Sensitivity/Impedance Outputs Output Regulation (1 kHz) Signal to Noise Ratio (Band Pass: 20 – 20,000 Hz) Compression Equalization Filters Controls Indicators Protection Connectors Power Consumption Color Dimensions Weight [...]

  • Page 12

    133-02-738-9B • Accessories Flush-mounting (in-wall) back box: BX-9F Surface-mounting (on-wall) back box: BX-9S Expanding kit: WE-2 Volume control cover (black): YA-910 • Optional products Volume control cover .......................................... 3 Key (for door) ...................................................... 2 Lift-off hinge (rec[...]