Toa A-503A free download

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Operation Instruction Manual TOA 500 SERIES MIXER POWER AMPLIFIER A-503A A-506A A-512A Features High quality design and construction. Full frequency response: 50 - 15,000Hz, ±3dB. Low distortion and noise level. 4 microphone inputs, 3 auxiliary inputs and a mag. phono input. 5. Isolated-transformer outputs complete with 4 ohms, 25V and 70V. 6. AC/DC operation: 120V AC and 24V DC 7. Individual bass and treble tone controls. 8. Signal processing input/output. 9. Self-protection circuitry design. 10. Muting function. 11. Remote volume control circuit. 1. 2. 3. 4. General Description The TOA 500 series Mixer Power Amplifiers A-512A, A-506A and A-503A are designed for PA system applications such as paging, announcements, intercommunications, background music and broadcasting in industrial plants, offices, schools, churches, department stores, shopping centers, night clubs, dining rooms, convention halls, auditoriums and recreation areas. The Primary feature is their ability to withstand overload or short-circuits of output. Because of the TOA-engineered circuitry design, the TOA 500 -series amplifiers require no complicated protective circuit to withstand accidents and mismatched output connections that may occur during the installation or use of a PA system. This results in very high reliability. The 500 series amplifiers come with 4 microphone inputs, 3 auxiliary inputs and a mag. phono input. Input 1 (Mic 1) and Input 2 (Mic 2) out of the 4 mic inputs are balanced inputs, while Input 3 (Mic 3) and Input 4 (Mic 4) are of unbalanced type. Input 3 and Input 4 can be changed to balanced type with the LI-51 microphone input module (optional). Two condenser microphone can be used with phantom power supplied from Input 1 and 2. And they have a remote volume control circuit on Input 2 as the volume can be adjusted at the microphone even when it is distant from the amplifier. The amplifiers are equipped with muting function. They may be used in conjunction With a speaker rated at 4 ohms or with 25volt, 70volt constant-voltage speaker systems. Three auxiliary inputs and a mag. phono input are provided with RCA pin jack. Preamp-Out and Power-Amp-ln receptacles are provided for easy connection of a signal processor to the amplifier. Emergency operation can be made by DC power source (24V DC) even in case of AC power failure. TOA Corporation KOBE, JAPAN 133-02-767-7A Printed in Taiwan TOA 500 SERIES Front Panel Controls and Features No. 1 2 3 4 Name Power on-off switch Function/Description Applies line power. Two position button switch for on-off modes. Comes on when power is turned on. Power indicator Input 1 - 5 volume controls Bass control Adjusts gain of Input 1-5 respectively. Adjusts bass response. Turn clockwise (CW) to boost and counterclockwise (CCW) to attenuate the bass response. Tone is flat at center. Adjusts treble response. Turn clockwise (CW) to boost and counterclockwise (CCW) to attenuate the treble response. Tone is flat at cente