KAC-PS501F

4-CHANNEL POWER AMPLIFIER

INSTRUCTION MANUAL

B64-1444-00 (EM)

Safety precautions

2WARNING
To prevent injury or fire, take the following precautions: When extending the ignition, battery, or ground cables, make sure to use automotivegrade cables or other cables with a 10 mm2 (AWG8) [5 mm2 (AWG10) 2] or more to prevent cable deterioration and damage to the cable coating. To prevent a short circuit, never put or leave any metallic objects (such as coins or metal tools) inside the unit. 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.

2CAUTION

To prevent a short circuit when replacing a fuse, first disconnect the wiring harness.
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

If the front panel gets dirty, turn off the power and wipe the panel with a dry silicon cloth or soft cloth.
Do not wipe the panel with a hard cloth or a cloth dampened by volatile solvents such as paint thinner and alcohol. They can scratch the surface of the panel and/or cause the indicator letters to peel off.
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 bottom covers of the unit. Do not install the unit in a spot exposed to direct sunlight or excessive heat or humidity. Also avoid places with too much dust or the possibility of water splashing. When replacing a fuse, only use a new one with the prescribed rating. Using a fuse with the wrong rating may cause your unit to malfunction.

Accessories

Part name Terminal cover (Power terminal) Self-tapping screws (mm) External View Number of Items 1 4

Installation procedure

Since there are large variety of settings and connections possible according to applications, read the instruction manual well to select the proper setting and connection. 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. Connect the speaker cables. 5. Connect the power cable, power control cable and grounding cable following this order. 6. Install the unit in the car. 7. Connect the negative - terminal of the battery. 2CAUTION Be sure to turn the power off before changing the setting of any switch. If the fuse blows, check cables for shorts, then replace the fuse with one of the same rating. Check that no unconnected cables or connectors are touching the car body. Do not remove caps from unconnected cables or connectors to prevent short circuits. Connect the speaker cables to appropriate speaker connectors separately. Sharing the negative cable of the speaker or grounding speaker cables to the metal body of the car can cause this unit to fail. After installation, check that the brake lamps, winkers, and wipers work properly.

English

Installation
Self-tapping screw Cooling fan
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Exhaust outlet

Air inlet
Installation board, etc. (thickness : 15 mm or more)
Since the power amplifier has no parts which require operation, it can be installed at a position away from the drivers seat without any hindrances. As generally accepted positions for its installation, places such as inside the trunk, etc. can be considered. Use the extension cables. (Optional.) Length 0.5m 1m 2m 4m 5m 6m Type RCA cable CA-2SL CA-12SL CA-22SL CA-52SL RCA cable (7mm) CA-3WL CA-13WL CA-23WL CA-53WL RCA cable (12mm) CA-5W CA-15W CA-25W CA-45W CA-65W 2CAUTION 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 amplifier in a place where people, resins, and other substances that are sensitive to heat will not come into contact with it. This unit has cooling fans to decrease the internal temperature. Be careful not to block the cooling fan openings when installing the unit. Blocking these openings will inhibit the cooling of the internal temperature and result in malfunction. When making a hole under a seat, inside the trunk, or somewhere else in the vehicle, check that there is nothing hazardous on the opposite side such as a gasoline tank, brake pipe, or wiring harness, and be careful not to cause scratches or other damage. Do not install near the dashboard, rear tray, or air bag safety parts. The installation to the vehicle should securely fasten the unit to a place in which it will not obstruct driving. If the unit comes off due to a shock and hits a person or safety part, it may cause injury or an accident. After installing the unit, check to make sure that electrical equipment such as the brake lamps, turn signal lamps and windshield wipers operate normally.

Controls

SPEAKER OUTPUT FUSE(20A4) BATT.

BRIDGED

CONTROL A INPUT SENSITIVITY(V)

0.5 0.2

HPF LPF STEREO MONO AB A

CONTROL B

FREQ (Hz)

OFF 25Hz

(MIN) (MAX)

INFRASONIC

FILTER

OPERATION

INPUT SELECT

EXT.AMP.CONT.

HPF LPF STEREO MONO AB

B.M.S. 80 FREQ(Hz)

(REMOTE) OPEN/ B.M.S. CLOSE

INPUT SENSITIVITY(V)

HPF LPF

0.5 0.2 FREQ (Hz)

STEREO

B.M.S. (+6)

LINE IN

LINE OUT

B.M.S.
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.

STEREO MONO

%#1 &

HI PASS 200

0.5 0.2 4

50 LO PASS

INFRASONIC B.M.S. 80 FREQ(Hz)

STEREO MONO HPF LPF

50 LO PASS 200

50 HI PASS 200

25Hz B.M.S. (+6)

Block diagram

#1 When FILTER is set to LPF, the sound is monaural (L+R). #2 When INFRASONIC is set to 15Hz or 25Hz, the sound is monaural (L+R). * Note that if OPERATION is set to MONO, Lch is still monaural. The speakers to be connected should have an impedance of 4 or greater. When multiple speakers are to be connected, ensure that the combined impedance is 4 or greater.
1 Fuse (20 A 4) 2 Battery terminal 3 Ground terminal 4 Amplifier A speaker output terminals 5 Amplifier B speaker output terminals y SPEAKER OUTPUT terminals Stereo Connections:
When you wish to use the unit as a stereo amplifier, stereo connections are used. The speakers to be connected should have an impedance of 2 or greater. When multiple speakers are to be connected, ensure that the combined impedance is 2 or greater for each channel.
The rated input of the speakers should be no less than the maximum output of the amplifier. Otherwise malfunction may result.
6 RCA cable ground lead terminal 7 Amplifier A LINE IN terminal 8 Amplifier B LINE IN terminal 9 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.

Bridged Connections:

When you wish to use the unit as a highoutput monaural amplifier, bridged connections are used. (Make connections to the LEFT channel (+) and the RIGHT channel (-) SPEAKER OUTPUT terminals.)
0 Power control terminal ! EXT.AMP.CONT. (external amplifier control) terminal
This controls the B.M.S. (See P.6).
CONTROL B INPUT SENSITIVITY(V)

FILTER FREQUENCY

COOLING FAN

50 HI PASS

4/3/2 CHANNEL POWER AMPLIFIER

AIR INDUCTION

OPERATION/PROTECTION

OPEN/CLOSE

LOW VOLTAGE

50 LO PASS HI PASS 200

200 LO PASS

@ INPUT SELECTOR switch

This switch selects the input method of the signals to be amplified by amplifiers A and B.

% FILTER switch

This switch allows to apply high-pass or low-pass filtering to the speaker outputs.
HPF (High-Pass Filter) position:
The filter outputs the band of higher frequencies than the frequency set with the HPF FREQUENCY control.

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.

OFF position:

The entire bandwidth is output without filtering.
# INPUT SENSITIVITY control
Adjust this control according to the pre-out level of the centre unit connected to this amplifier. The sensitivities of amplifiers A and B can be adjusted independently regardless of the position of the input selector switch.
LPF (Low-Pass Filter) position:
The filter outputs the band of lower frequencies than the frequency set with the LPF FREQUENCY control. The speaker output is automatically turned monaural (L+R) and the bass boost function is activated.

^ HPF FREQUENCY control

Sets the cutoff frequency when the FILTER switch is set to HPF.
Refer to Specifications on the centre units instruction manual about the pre-out level.
& LPF FREQUENCY control
Sets the cutoff frequency when the FILTER switch is set to LPF.

$ OPERATION switch

The amplification methods of the signals input to amplifiers A and B can be selected independently according to the setting of this switch.
* INFRASONIC FILTER switch
When this switch is set to 15 Hz or 25 Hz, frequencies below the setting value will be cut. This serves to get rid of unwanted vibrations that do not result in sound and improves the speakers ability to reproduce sound. Note that the speaker output will automatically be set for monaural (L+R) sound.

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.)
B.M.S. (Bass Management System)

25Hz LPF HPF

15Hz OFF

POWER L

LO PASS

HI PASS

MONO LPF

CONTROL A

HPF 25Hz

B.M.S. indicator

s If the unit is not going to be operated from the outside: 1 B.M.S. switch
This boosts the bass, focusing mainly on the frequency setting determined using the B.M.S. FREQUENCY control. The bass boost applies only to the B amplifier.
(REMOTE) OPEN/CLOSE or (REMOTE) B.M.S. position:
When the switch is in this position, the bass is not boosted. Bass boost Flat (OFF) Operations using the Slide panel OPEN/CLOSE button

B.M.S. (+6) position:

When the switch is in this position, the bass is boosted by 6dB. The B.M.S. indicator glows. Bass boost +6dB (ON) Operations using the Slide panel OPEN/CLOSE button
If the slide panel meets an obstacle whilst sliding, the slide operation will be halted. If this happens, remove the obstacle and then press the OPEN/CLOSE button again. If the centre unit power is switched OFF, or the vehicle engine is switched OFF, whilst the slide panel is open, the slide panel will then close automatically. The next time the power is turned ON or the vehicle engine is turned ON, the slide panel will return to its original open state. If the B.M.S. switch setting is changed to (REMOTE), the slide panel will close in preparation for remote operation, even if the EXT.AMP.CONT. terminal is not connected.
Take care not to allow your finger or any other object to be trapped by the slide panel whilst it is sliding.
2 B.M.S. FREQUENCY control
When the B.M.S. switch is set to the B.M.S. (+6) position, this control can be used to adjust the central frequency that you want to emphasise.

3 OPEN/CLOSE button

Each time you press this button, the slide panel either opens or closes.
s If the unit is going to be operated from the centre unit:
The amount of bass boost and the opening/closing of the slide panel can be controlled from the centre unit. Additionally, up to 3 power amplifiers can be set at the same time.
Kenwood centre units released in 1999 or later having an EXT.AMP.CONT. cable operate this unit. Instructions on how to operate the centre unit will be found in the instruction manual supplied with the centre unit.

1 B.M.S. switch

This switch is used to select the range of control operations that can be carried out from the centre unit. The bass boost only applies to the B amplifier. When the bass boost is switched ON, the B.M.S. indicator glows.

This control allows you to use the B.M.S. to adjust the central frequency that you want to emphasise.
When the B.M.S. switch is in the B.M.S. (+6) position, the slide panel will open or close each time the button is pressed. When the B.M.S. switch is set to the (REMOTE) position, the centre unit will control the slide panel. If you want to adjust the control inside the slide panel, you can open/close the slide panel temporarily by pressing the OPEN/CLOSE button.
(REMOTE) OPEN/CLOSE position:
When the switch is in this position, only the opening/closing of the slide panel can be controlled from the centre unit; the bass cannot be boosted. AMP AMP AMP Centre unit BASS BASS BASS setting status Flat +6 +12 Bass boost Flat (OFF) Slide panel CLOSE OPEN
(REMOTE) B.M.S. position:
When the switch is in this position, any of the three bass boost settings FLAT, +6dB and +12dB can be selected from the centre unit. If "+6 dB" or "+12 dB" is selected, the slide panel will open. AMP AMP AMP Centre unit BASS BASS BASS setting status Flat +6 +12 Flat +6dB +12dB Bass boost (OFF) (ON) (ON) Slide panel CLOSE OPEN
When the switch is in this position, the bass is boosted by 6dB, regardless of any operation carried out from the centre unit. AMP AMP AMP Centre unit BASS BASS BASS setting status Flat +6 +12 Bass boost +6dB (ON) Operations using the Slide panel OPEN/CLOSE button
If the slide panel meets an obstacle whilst sliding, the slide operation will be halted. If this happens, remove the obstacle and then press the OPEN/CLOSE button again. When the B.M.S. is in the (REMOTE) position, and control operations are carried out on the centre unit, the slide panel will return to the status set on the centre unit even if it is opened/closed using the OPEN/CLOSE button. If the centre unit power is switched OFF, or the vehicle engine is turned OFF, when the slide panel is open, the slide panel will automatically close. When the power is turned back ON, or when the vehicle engine is turned ON, the slide panel will carry out an action depending on the setting status of the B.M.S. switch, as follows. * If the B.M.S. switch is in the (REMOTE) position, the slide panel will obey the setting on the centre unit. * If the B.M.S. switch is in the B.M.S. (+6) position, the slide panel will return to its original open state.

Indicator

OPERATION/PROTECTION OPEN/CLOSE

LOW VOLTAGE B.M.S.

1 POWER indicator
This indicator glows when the unit's power is turned ON.

s PROTECTION function

This unit incorporates a protection function which protects the main unit and speakers from troubles. The unit stops to function when the protection function is activated.

2 COOLING FAN indicator

When the unit's internal temperature rises, the side fan is activated. If the internal temperature rises even further, the slide panel opens automatically, and the cooling fan on the top is activated. Whilst the top cooling fan is in operation, the COOLING FAN indicator blinks.
When the OPERATION/PROTECTION indicator blinks:
A speaker cable may be short-circuited. A speaker output may be in contact with the ground. The temperature of the internal parts may be higher than 120C (248F) The fuse of this unit may be blown. The unit may be malfunctioning and sending DC signal to the speaker output.
3 OPERATION/PROTECTION indicator
This indicator glows when the power comes ON normally. If the PROTECTION function is activated, the indicator blinks or goes out.

4 LOW VOLTAGE indicator

This indicator glows when the power voltage falls below 11V (volts). If the power supply voltage returns to full after a voltage drop, this indicator will blink to alert the user that a voltage drop has occurred. The number of blinks indicates the number of times the voltage has dropped (up to a maximum of 10).
When the POWER indicator and the OPERATION/PROTECTION function both go out:
The fuse of this unit may be blown.
When the LOW VOLTAGE indicator glows or blinks:
Is the battery exhausted? The car battery has a small capacity. If the battery cable is too thin or too long, it will not be able to supply enough power. Is the battery cable deteriorated?

5 B.M.S. indicator

This indicator glows when the bass boost is turned ON using the B.M.S. (See P.6).
If indicators 2 to 5 light up in succession or blink in unison, the system is in DEMO mode. If this happens, cancel DEMO mode by pressing the OPEN/CLOSE button.

Connection

s Power cable connection
To prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the batterys positive terminal.
Wiring If a buzzing noise is heard from the speakers when the engine is running, connect a line noise filter (optional) to each of the battery cable. Do not allow the cable to directly contact the edge of the iron plate by using Grommets. Connect the ground cable to a metal part of the car chassis that acts as an electrical ground passing electricity to the batterys negative - terminal. Do not turn the power on if the ground cable is not connected. Please be sure to install a protective fuse in the power cable, near the battery. Use a fuse which has a capacity about 10A higher than the capacity of the fuse in the unit. For the power cable and the earth cable, use (flame-resistant) power wiring cables for in-car use. For the power cable, use a power wiring cable with a current capacity about 10A higher than the capacity of the protective fuse (about 20A higher than the capacity of the fuse in the unit). When more than one power amplifier are going to be used, use a power supply wiring cable and protective fuse of greater current-handling capacity than the total maximum current drawn by each amplifier. Example: One Power Amplifier Is Used Fuse capacity Protective Fuse Cross-sectional Area of Wiring Cable (AWG) 90 A 1 [30 A 3] 80 A 10 mm2 (AWG 8) or greater 1

30 A 90 A 30 A 30 A 30 A 30 A 30 A

Lead terminal *

Power terminal

Battery cable *

Terminal cover Ground cable *
Lead terminal * Protective Fuse

Battery

* : Commercially available parts Power terminal Pass battery and ground cables through supplied terminal cover and connect to respective terminals. After completing connections, fasten terminal cover over terminal bracket.

s RCA cable connection

A Left input

B Left input

RCA cable ground terminal

A Right input

B Right input
Power control cable (To Power control terminal) CENTRE UNIT (Cassette receiver, CD receiver, etc.)

RCA cable * Front output

Rear output * : Commercially available parts 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 cable is connected to this terminal.

s 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. The impedance of the speakers that are going to be connected should be 2 or greater (for stereo connections), or 4 or greater (for bridged connections). When more than one set of speakers are going to be used, calculate the combined impedance of the speakers and then connect suitable speakers to the amplifier.
Examples: Stereo Connections (4) 200 W or greater

200W (4)

Bridged Connections (4) 600 W or greater
200W (2) 200W (2) 100W (8) 100W (8)
Maximum output of the amplifier Combined impedance
Rated input power and impedance of the speakers
s Speakers cable connection (Stereo Connections)
Front Left speaker Front Right speaker Lead terminal * A Left output A Right output

Speaker output terminals B Left output B Right output

A B L R

Rear Right speaker Rear Left speaker

(Bridged Connections)

Speaker (Bridged) Lead terminal * A Bridged output
Speaker output terminals B Bridged output
Speaker (Bridged) * : Commercially available parts

s Control terminal

Attach the connection terminal to a commercially available wiring cable for in-car use, and connect it to the unit.
An EXT.AMP.CONT. terminal can only be attached if Kenwood centre unit is a model released in 1999 or latter, and has an EXT.AMP.CONT. cable. Using the external amp control, up to 3 power amplifiers can be operated simultaneously (although this may not be possible, depending on the type of wiring cable used, and its length). Power control lead terminal External amplifier control terminal
Power control cable (Blue/ White) CENTRE UNIT (Cassette receiver, CD receiver, etc.)

P.CONT. EXT.AMP. CONT.

External amplifier control cable (Pink / Black)

Extension cable *

Lead terminal * * : Commercially available parts

System examples

s Full-range 4-channel + Subwoofer system
OPERATION FILTER INPUT SENSITIVITY(V) 2 FREQ (Hz) CONTROL A

CENTRE UNIT

Front speaker Rear speaker Subwoofer

AB A STEREO MONO

Switch setting
OPERATION FILTER INPUT SENSITIVITY(V) 2 FREQ (Hz)

L LINE R OUT

LO PASS 50 HI PASS 200

Amplifier

s High-pass + Subwoofer system
(High pass) Subwoofer (L + R) (Bridged)
OPERATION FILTER INPUT SENSITIVITY(V) FREQ (Hz) CONTROL B
s High-power 2-channel system

L CENTRE UNIT R

L R L R
Left speaker Right speaker

s Tri-mode

(High pass)
Subwoofer (L + R) (Bridged)
qPrinciple of Tri-mode Method of frequency band division using a coil and capacitorin case of 6dB/oct. slope Crossover Frequency 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)
C= 159000 (F) fc x R 159 x R L= (mH) fc fc=Cut of Frequency (Hz) R=Speaker Impedance ()

Frequency

qExample: 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).
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.

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.)

POSSIBLE CAUSE

SOLUTION
Connect the input (or output) Input (or output) cables are cables. disconnected. Check connections by referring Protection circuit may be to "Indicator". activated. The fuse may be blown because Replace the fuse with a new fuse and use a lower volume. 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. Adjust the control correctly referring to Controls. Connect them properly checking the + / - of the terminals and cables well. Connect the speaker cable again so that it is not pinched by anything. Set switches properly by referring to "System examples". Cancel DEMO mode by pressing the OPEN/CLOSE button. Check the B.M.S. and operate the slide panel remotely or manually. The B.M.S. switch is set to "(REMOTE)". Check that the external amplifier control cable is properly connected.
The output level is too small (or too large). The sound quality is bad. (The sound is distorted.)
If the slide panel moves of its own accord.
The system is in DEMO mode. The slide panel has gone into remote operation mode.
The external amplifier controller (B.M.S.) will not work.
The B.M.S. switch is set to "B.M.S. (+6)". The external amplifier control cable has come loose.

Specifications

Specifications subject to change without notice.

Audio Section

Max Power Output (4 ) 4 Channel Mode....150 W Channel Mode...150 W 2 + 600 W Channel Mode....600 W 2 Rated Power Output (4 ) (+B = 12.0 V) 4 Channel Mode...50 W 4 (20 Hz ~ 20 kHz, 0.05 % THD) 3 Channel Mode..50 W 2 (1 kHz, 0.05 % THD) + 200 W 1 (1 kHz, 0.5 % THD) 2 Channel Mode..200 W 2 (1 kHz, 0.5 % THD) Rated Power Output (2 ) (+B = 12.0 V) 4 Channel Mode..100 W 4 (1 kHz, 0.5 % THD) Rated Power Output (4 ) (+B = 14.4 V) 4 Channel Mode...75 W 4 (DIN45324, +B=14.4 V) 3 Channel Mode..75 W 2 (1 kHz, 0.05 % THD) + 300 W 1 (1 kHz, 0.5 % THD) 2 Channel Mode..300 W 2 (1 kHz, 0.5 % THD) Rated Power Output (2 ) (+B = 14.4 V) 4 Channel Mode..150 W 4 (1 kHz, 0.5 % THD) Frequency Response (+0, 3 dB)...5 Hz ~ 50 kHz Total Harmonic Distortion (Rated power)#...0.01 % (1 kHz) Signal to Noise Ratio...110 dB Sensitivity (rated output) (MAX)....0.2 V Sensitivity (rated output) (MIN)....5.0 V Input Impedance....10 k Damping Factor....More than 200 Low Pass Filter Frequency (24 dB/oct.)...50 ~ 200 Hz (Variable) High Pass Filter Frequency (12 dB/oct.)..50 ~ 200 Hz (Variable) Infrasonic Filter Frequency (24 dB/oct.)...15 / 25 Hz

# Sensitivity = Mini. , Through LPF (30 kHz)

General

Operating Voltage...12.0 V (11 ~ 16 V allowable) Current Consumption (4 , +B = 12.0 V, 10% THD)..42 A Dimensions (W H D)....380 mm Weight.....7.1 kg