^ OPERATION switch This switch is used to select the operation mode of the amplifier. • STEREO position: The amplifier can be used as a stereo amplifier. • MONO (Lch) position: Amplifies the signal input from the left side only. Set to this position and make bridged connections to use as a high-power monaural amplifier. (The input right signal is not output.) & INPUT SENSITIVITY control Set this control according to the pre-output level of the center unit connected with this unit, or to the maximum power output of the genuineaccessory car stereo. Use the diagram on the right as a guide. NOTE For the pre-output level or the maximum power output, refer to the in the instruction manual of the center unit. * BOOST LEVEL (Bass boost level) control (KAC-7252 only) Sets the level by which the low frequency range should be boosted. ( FREQUENCY (Bass boost frequency) control (KAC-7252 only) Sets the center frequency around which the low frequency range should be boosted. .... ................................ .. .. .. .... .... .... .... .... .... .... .... .... .... ...... ............................ .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .................. Remote controller (KAC-7252 only) 6 English .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ................ ................ .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. System examples ¦ Tri-mode CENTER UNIT (High pass) Subwoofer (L + R) (Bridged) Principle of Tri-mode Method of frequency band division using a coil and capacitor…in case of 6dB/oct. slope. L C 0 dB -3 dB Coil (L): Passes low frequencies and blocks high frequencies. (Low pass) Capacitor (C): Passes high frequencies and blocks low frequencies. (High pass) Crossover Frequency Frequency 159000 C= (.F) fc . R 159 x R L= (mH) fc fc=Cut of Frequency (Hz) R=Speaker Impedance (.) Example: When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms. Prepare commercially-available coil and capacitor with the closest ratings to the results calculated from the formula above. The capacitor rating should be as close as possible to 331.25 (.F) and the coil rating should be as close as possible to 5.3 (mH). 2CAUTION • If you wish to bridge-connect a speaker, the speaker impedance must be no less than 4 ohms. Connecting a speaker with an impedance lower than 4 ohms may damage the unit. • Be sure to connect capacitors to speakers to which high frequencies will be passed. Failure to do so will result in a drop of the combined impedance with the subwoofer. • Ensure that the withstand voltage and current ratings of the capacitors (C) and coils (L) are sufficient. CENTER UNIT ¦ 2-channel system ¦ High-power 2-channel subwoofer system Right speaker Left speaker Right subwoofer (Bridged) Left subwoofer (Bridged) ¦ 2-channel + Subwoofer system Subwoofer (L + R) (Bridged) CENTER UNIT CENTER UNIT Right speaker (High pass) Left speaker (High pass) English 7 Troubleshooting Guide What might appear to be a malfunction in your unit may just be the result of slight misoperation or miswiring. Before calling service, first check the following table for possible problems. PROBLEM POSSIBLE CAUSE SOLUTION No sound. (No sound from one side.) (Blown fuse.) • Input (or output) cables are disconnected. • Protection circuit may be activated. • Volume is too high. • The speaker cord is shorted. • Connect the input (or output) cables. • Check connections by referring to . • Replace the fuse and use lower volume. • After check the speaker cord and fixing the cause of the short, replace the fuse. The output level is too small (or too large). • The input sensitivity adjusting control is not set to the correct position. • Adjust the control correctly referring to . The sound quality is bad. (The sound is distorted.) • The speakers wire are connected with wrong + /-polarity. • A speaker wire is pinched by a screw in the car body. • The switches may be set improperly. • Connect them properly checking the + / - of the terminals and wires well. • Connect the speaker wire again so that it is not pinched by anything. • Set switches properly by referring to . The Remote Controller does not function. • The Remote Cable is disconnected. • The "BOOST LEVEL" is set to "0dB". • Connect the Remote Cable securely and correctly. • Adjust the "BOOST LEVEL". Specifications Specifications subject to change without notice. Audio Section ........................................................................................................................KAC-7252 KAC-7202 Max Power Output ......................................................................................................................................................................................1000 W 920 W Rated Power Output (+B = 14.4 V) Normal (4 .) (20 Hz – 20 kHz, 0.08 % THD) .....................................................
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