Page 2 - Contents; Cautions
Contents Cautions General Description Features Front Panel Rear Panel Input/Output Connections Installation Precautions Applications Optional Matching T r a n s f o r m e r Mounting Performance Graphs Block Diagram Specifications A c c e s s o r i e s Appearance 2 3 3 4 5 6 6 7 • 8 9 10 11 12 12 12 ...
Page 4 - Front Panel
Front Panel Lowpass Filter Slope Selection Switch This switch sets the lowpass f i l t e r ' s per octave attenuation f o r either 6dB or 12dB. Peak Indicator LED The peak indicator LED lights when either the input or the output level reaches 3 dB below c l i p p i n g . Input Level Control This c o...
Page 5 - Rear Panel
Rear Panel AC Fuse Holder When replacing, be sure to use the fuse of s p e c i f i e d rating and type to avoid the p o ssibility of f i r e . Fuse rating 220-240V version 250V T80mA120V v e r s i o n 250V 0.2A AC Power Cord Ground Screw Terminal Hum can result f r o m a ground loop to be f o r m e ...
Page 6 - Input/Output Connections; Installation Precautions
Input/Output Connections Input terminal from mixer, etc. Input terminal from mixer, etc. E-1231 E-1231 Power Amplifier Speaker System Installation Precautions Ground Loops In any audio system, there are numerous ways by which ground loops can be created.For example, they may occur when the E-1231 is...
Page 7 - Applications
Applications Feedback Prevention When the overall gain of a sound system is increased,feedback will o c c u r at f r e q u e n c i e s where the system response has peaks. Suppose the system has anuneven frequency response like that shown in the following diagram. The frequency at which feedback wil...
Page 9 - Optional Matching Transformer Mounting
Optional Matching Transformer Mounting [CAUTION] THESE SERVICING INSTRUCTIONS A R E FOR USE BY QUALIFIED PERSONNEL ONLY.TO AVOID ELECTRIC SHOCK DO NOT PERFORM ANY SERVICING OTHER THANTHAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. REFER ALL SERVICING TO QUALIFIED SERV...
Page 10 - Performance Graphs
Performance Graphs Frequency Response (Each slider is set at a max or min position) Frequency Response (ex. 800Hz slider) Frequency Response (ex. 630Hz, 800Hz, 1kHz slider) High pass Filter Low pass Filter — 10 —
Page 11 - Block Diagram
Page 12 - Specifications; Accessories; Appearance; TOA Corporation
Specifications Frequency Response ±1dB, 20Hz to 20kHz Total Harmonic Distortion Less than 0.01% at 1 kHz, all sliders at 0 position,rated output Equalization Center Frequencies 31.5Hz to 16kHz31.5Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz,160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 4kHz, 5kHz, 6....