TOA 900 free download

File name P-906_12_24MK2.pdf

Operating Instructions TOA 900 SERIES II POWER AMPLIFIER P-906MK2 P-912MK2 P-924MK2 P-906MK2 P-912MK2 P-924MK2 THE LIGHTNING FLASH WITH ARROWHEAD WITHIN A TRIANGLE IS INTENDED TO TELL THE USER THAT PARTS INSIDE THE PRODUCT ARE A RISK OF ELECTRIC SHOCK TO PERSONS. TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. THE EXCLAMATION POINT WITHIN A TRIANGLE IS INTENDED TO TELL THE USER THAT IMPORTANT OPERATING AND SERVICING INSTRUCTIONS ARE IN THE PAPERS WITH THE APPLIANCE. Please follow the instructions in this manual to obtain the optimum results from this unit. We also recommend that you keep this manual handy for future reference. TOA Corporation Contents General description Features Nomenclature Front panel Rear panel Input connections Output connections Rack mounting Operation Volume adjustment Installation Servicing Specifications Appearance (P-906MK2/P-912MK2) Appearance (P-924MK2) 2 2 3 4 5 6 7 8 8 8 8 9 10 11 General Description The TOA P-906MK2, P-912MK2 and P-924MK2 Power Amplifiers deliver up to 60 watts, 120 watts and 240 watts of power respectively at less than 0.5% total harmonic distortion (THD) from 20 to 20,000 Hz (transformerless 4-ohm output). The power amplifiers have a high-impedance direct input and an input port (edge connector) to accept one plug-in module. Module selection is determined by application among the TOA plug-in modules. The power amplifiers have a low-cut switch for a cutoff frequency of 60 Hz, and an input-level switch for input sensitivity of 1V (0 dBV) or 100mV (­20 dBV). Output terminals provide connections for 4-ohm and 8-ohm speakers, plus 25-volt and 70-volt speaker distribution outlets. With plug-in modules, the power amplifiers may be used as a PA amplifier. The power amplifiers can be rack mounted by using optional rack mounting bracket MB-25B(P-906MK2, P-912MK2) and MB-35B(P-924MK2). The optional perforated panel PF-511 provides suitable ventilation, finished in color to match the power amplifiers. Features 1. Wide frequency response : 20 ~ 20,000 Hz ± 1 dB 2. Low distortion and noise level 3. Excellent output regulation 4. A full range of plug-in modules 5. Self-protecting circuitry design 6. Varied output impedances : 4 ohms, 8 ohms, 25 and 70 volts 7. Input level switch (selectable 1000 mV/100 mV) 8. Portable or rack mounting type ­2­ Nomenclature Front Panel P-906MK2, P-912MK2 P-924MK2 Power Switch Applies line power. Two-position push button Peak Indicator LED Red LED lights when amplifier approaches switch for on/off modes. Power Indicator LED Green LED lights when the power is switched "ON". Signal Indicator LED Green LED lights when more than -30 dB signal level is fed to the inputs by means of the master volume control. clipping level. If steady lit, the input level control should be turned down until the LED flashes. Protection Indicator LED Remains lit for about 5 seconds afte