KAC-749S

      KAC-749S is a kind of 4-channel power amplifier. There are some specifications about KAC-749S. Max power output(4) . 4 channel mode is 80 W *4. Max power output(4). 3 channel mode is 80 W *2 + 250 W*1. Max power output(4) . 2 channel mode is 300 W *2. Rated power output(2). 4 channel mode(1 KHz, 0.8% THD) is 60 W *4. Rated power output(2). Frenquency response (+0, 0.3 dB) is from 5 Hz to 50 KHz. Signal to noise ratio is 100 dB. Sensitivity (MAX) (rated output) is 0.2 V.  Sensitivity (MIN) (rated output) is 5.0 V. Input impendence is 10 K. Low Pass Filter Frequency (12 dB/oct.) (Variable) is from 50 Hz to 200 Hz. High Pass Filter Frequency (12 dB/oct.) (Variable) is from 50Hz to 200 Hz. Bass Boost Circuit (90 Hz) is 6 dB. Operating Voltage (11 ~ 16 V allowable) is 14.4 V . Current Consumption (1 kHz, 10 % THD) is 26 A. Dimensions (W H D) are 261 57 256 mm (10-1/42-1/410-1/16 in.). Weight is 3.5 kg (7.7 lb).
     Then, there are some troubleshooting guide about KAC-749S. If the device is no sound or no sound from one side, the possible cause will be : The first one is that input for cables are disconnected. The second one is protection circuit maybe activated.The third one is volume is too high . The forth one is the speaker cord is shorted. The solution to the first cause is to cnnect the input (or output ).The solution to the second one is to check connections by refering to " power indicator". The solution to the third one  is to replace the fuse and use lower volume. The solution to the forth cause is to replace the fuse after check the speaker cord and fixing the cause of the short. If the output level is too small or too large, the cause will be that the input sensetivity adjusting control is not set to the correct position. And the solution to this problem is to adjust the control correctly referring to " Controls". If the sound quality is bad or the sound is distorted, the cause will be : The first one is the speakers wire are connected with wrong polarity and the solution is to connect them properly checking the +/- of the terminals and the wires well. The second one is a speakers wire is pinched by a screw un the car body and the solution is to connect the speaker wire again so that it is not pinched by anything. The third one is the switches may be set improperly and the solution is to set switches properly by referring to "System examples".
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