Kenwood KAC-648S - User Manual

KAC-648S
4-CHANNEL POWER AMPLIFIER 7 Page 2-11
INSTRUCTION MANUAL
AMPLIFICATEUR DE PUISSANCE 4 CANAUX 7 Page 12-21
MODE D’EMPLOI
AMPLIFICADOR DE POTENCIA DE 4 CANALES 7 Page 22-31
M A N U A L DE INSTRUCCIONES
© PRINTED IN MEXICO B64-1363-00 (KM)
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

Summary

Instruction Manual

For Your Records

Information for recording serial numbers and contacting dealers for service.

Safety Precautions

Injury and Fire Prevention Warnings

Precautions to prevent personal injury, fire hazards, and unit damage during operation.

Protection Function

Explains the unit's protection circuit and when it activates to prevent damage.

Installation Procedure

General Installation Steps

Step-by-step guide for connecting and physically installing the amplifier in a vehicle.

Installation Precautions

Warnings and cautions regarding placement, heat dissipation, and vehicle wiring during installation.

Controls and Operation

Amplifier Terminals and Switches

Details power, speaker, input terminals and selection switches for amplifiers A and B.

Signal Input and Filtering Controls

Describes LINE OUT, RCA ground, input sensitivity, operation, and filter switches for signal processing.

System Examples

Wiring Configurations

Illustrates system configurations like High-pass + Subwoofer, High-power 2-channel, and Tri-mode.

Tri-mode Frequency Division

Explains using coils and capacitors for frequency band division in Tri-mode with calculations.

Connection

Power Wire Connection

Details how to connect the power supply wires, including battery, ground, and remote wires, with safety precautions.

Speaker Wire Connection (Stereo)

Illustrates stereo speaker wiring for front/rear left/right channels.

Speaker Wire Connection (Bridged)

Shows how to connect speakers using bridged outputs for higher power.

Speaker Selection

Guidance on choosing speakers with appropriate impedance and power ratings for the amplifier.

Speaker Connection Examples

Provides examples of stereo and bridged connections with speaker power and impedance ratings.

RCA Cable Connection

Details connecting the unit via RCA cables from the center unit, including ground lead.

Speaker Level Input Connection

Explains connecting the amplifier using speaker-level outputs from a car stereo.

Troubleshooting Guide

Common Problems and Solutions

Lists common issues like no sound, distorted sound, and incorrect output levels with their causes and fixes.

Specifications

Audio and General Specifications

Provides detailed technical specifications for audio output, frequency response, sensitivity, and general unit dimensions.

Kenwood KAC-648S Specifications

Audio Section

max power output (4 Ω) 4 channel mode	50 W × 4
max power output (4 Ω) 3 channel mode	50 W × 2 + 140 W × 1
max power output (4 Ω) 2 channel mode	140 W × 2
rated power output (4 Ω) 4 channel mode	25 W × 4 (20 Hz ~ 20 kHz, less than 0.08 % THD)
rated power output (4 Ω) 3 channel mode	25 W × 2 (1 kHz, 0.08 % THD) + 70 W × 1 (1 kHz, 0.8 % THD)
rated power output (4 Ω) 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 consumption	22 A (1 kHz, 10% THD)
dimensions (W × H × D)	260 × 56.5 × 209 mm
dimensions (W × H × D) in inches	10-1/4 × 2-1/4 × 8-1/4 in.
weight	3.0 kg (6.6 lb)