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KAC-648

4-CHANNEL POWER AMPLIFIER

INSTRUCTION MANUAL

B64-1364-00 (EM)

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Summary of Contents for KAC-648

Page 1: ...KAC 648 4 CHANNEL POWER AMPLIFIER INSTRUCTION MANUAL B64 1364 00 EM ...

Page 2: ...t If the unit starts to emit smoke or strange smells turn off the power immediately and consult your Kenwood dealer Do not touch the unit during use because the surface of the unit becomes hot and may cause burns if touched To prevent damage to the machine take the following precautions Be sure the unit is connected to a 12V DC power supply with a negative ground connection Do not open the top or ...

Page 3: ...ces such as inside the trunk etc can be considered Use the extension cables Optional Do not install the unit under the carpet Otherwise heat build up occurs and the unit may be damaged Install this unit in a location which allows heat to easily dissipate Once installed do not place any object on top of the unit The surface temperature of the amplifier will become hot during use Install the amplifi...

Page 4: ...lfunction may result 7 Speaker level input terminals 8 INPUT SELECTOR switch This switch selects the input method of the signals to be amplified by amplifiers A and B A B position Amplifies both of the signals input to amplifiers A and B A position Amplifies only signal input amplifier A with both amplifiers A and B 9 Amplifier A LINE IN terminal 0 Amplifier B LINE IN terminal 2CAUTION 4 Controls ...

Page 5: ...eo 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 FILTER switch These switches allow filtering of the speaker output signals HPF High Pass Filter position Only frequencies of 150Hz or higher are output Frequencies below 150Hz are cut LPF L...

Page 6: ... Hz R Speaker Impedance Ω 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 µF and the coil rating should be as close as possible to 5 3 mH If you wish to...

Page 7: ...at acts as an electrical ground passing electricity to the battery s negative terminal Do not turn the power on if the ground cable is not connected Be sure to attach a protective fuse into the battery cable close to the battery Use a protective fuse having a capacity that is about 10 A higher than the maximum current drawn by the amplifier Use vehicle type fire resistant power supply wiring cable...

Page 8: ...Left output A Right output Lead terminal Commercially available parts Connection Speaker terminal polarity B Bridged output Speaker Bridged Speaker Bridged Speaker terminal polarity Speaker Selection The rated input power of the speakers that are going to be connected should be greater than the maximum output power in Watts of the amplifier Use of speakers having input power ratings that are less ...

Page 9: ...CA cable Commercially available part RCA cable ground terminal When using an RCA cable with a ground lead attached connect the ground lead to this terminal Do not use this terminal for power source grounding This unit will be damaged if the power source grounding wire is connected to this terminal 2CAUTION Front output Rear output A Left input B Left input RCA cable ground terminal To Power contro...

Page 10: ...FF by the ignition key switch ACC line With this connection shock noise may be generated when the power of the genuine accessory car stereo is switched ON OFF 2CAUTION Genuine accessory car stereo Speaker level input connection Connect the unit by inserting it in the connection between the genuine accessory car stereo and speakers Do not connect cables and leads to both RCA cable input jacks and t...

Page 11: ...e may be blown because the volume was too high The input sensitivity adjusting control is not set to the correct position The speakers cable are connected with wrong polarity A speaker cable is pinched by a screw in the car body The switches may be set improperly Connect the input or output cables Check connections by referring to Protection function Replace the fuse with a new fuse and use a lowe...

Page 12: ...70 W 1 1 kHz 0 8 THD 2 Channel Mode 70 W 2 1 kHz 0 8 THD Rated Power Output 2 Ω 4 Channel Mode 35 W 4 1 kHz 0 8 THD Frequency Response 10 Hz 45 kHz 0 1 dB Signal to Noise Ratio 100 dB Sensitivity MAX 0 2 V rated output Sensitivity MIN 4 0 V rated output Input Impedance 10 kΩ Low Pass Filter 80 Hz 12 dB oct High Pass Filter 150 Hz 12 dB oct General Operating Voltage 14 4 V 11 16 V allowable Current...

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