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Kenwood KAC-648S Instruction Manual

4-channel power amplifier
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KAC-648S
4-CHANNEL POWER AMPLIFIER
INSTRUCTION MANUAL
AMPLIFICATEUR DE PUISSANCE 4 CANAUX
MODE D'EMPLOI
AMPLIFICADOR DE POTENCIA DE 4 CANALES
M A N U A L DE INSTRUCCIONES
Take the time to read through this instruction manual.
Familiarity with installation and operation procedures will help
you obtain the best performance from your new power amplifier.
For your records
Record the serial number, found on the back of the unit, in the spaces
designated on the warranty card, and in the space provided below.
Refer to the model and serial numbers whenever you call upon your
KENWOOD dealer for information or service on the product.
Model KAC-648S Serial number
© PRINTED IN MEXICO B64-1363-00 (KM)
Page 2-11
Page 12-21
Page 22-31

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  Summary of Contents for Kenwood KAC-648S

  • Page 1 Refer to the model and serial numbers whenever you call upon your KENWOOD dealer for information or service on the product. Model KAC-648S Serial number © PRINTED IN MEXICO B64-1363-00 (KM)
  • Page 2: Safety Precautions

    . English NOTE • If you experience problems during installation, consult your Kenwood dealer. • If the unit does not seem to be working right, consult your Kenwood dealer. Cleaning the unit...
  • Page 3: Installation Procedure

    Installation procedure 1 . Remove the ignition key and disconnect the negative - terminal of the battery to prevent short circuits. 2 . Set the unit according to the intended usage. 3 . Connect the input and output cables of the units. 4 .
  • Page 4 Controls This is a 4 channel amplifier including 2 stereo amplifiers in a body. One amplifier is referred to as amplifier A and the other is amplifier B. This unit is compatible with a large variety of systems by combining the switches and functions described in the following. Amplifier A 1 Fuse (25 A 2 Battery terminal...
  • Page 5: System Examples

    ! LINE OUT terminal These jacks output respectively the signals input to amplifiers A and B. They always output the stereo signals regardless of the position of the OPERATION switch. @ RCA cable ground lead terminal # 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...
  • Page 6 System examples High-pass + Subwoofer system High-power 2-channel system Tri-mode Principle of Tri-mode Method of frequency band division using a coil and capacitor•••in case of 6dB/oct. slope Crossover Frequency 0 dB -3 dB Example: When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms.
  • Page 7 • When more than one power amplifier are going to be used, use a power supply wiring wire and protective fuse of greater current-handling capacity than the total maximum current drawn by each amplifier. Example: One Power Amplifier Is Used Model Maximum Current Drawn KAC-648S 22 A Power control wire Ground wire Protective Fuse Battery...
  • Page 8 Connection Speakers wire connection (Stereo Connections) A Left output B Left output (Bridged Connections) 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 than the output power of the amplifier will cause smoke to be emitted as well as damage.
  • Page 9 E x a m p l e s : Model Stereo Connections (4 ) KAC-648S 50 W or greater Maximum output of Combined the amplifier impedance RCA cable connection CAUTION Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals simultaneously, for this may cause malfunction or damage.
  • Page 10 Connection Speaker level input connection Connect the unit by inserting it in the connection between the genuine-accessory car stereo and speakers. CAUTION Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals simultaneously, for this may cause malfunction or damage. To Power control (REMOTE) terminal Car fuse...
  • Page 11: Troubleshooting Guide

    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 No sound. (No sound from one side.) The output level is too small (or too large).