Kenwood Stereo Amplifier KAC X621 User Manual

KAC-X621

KAC-PS621

KAC-X521

KAC-PS521

STEREO/BRIDGEABLE POWER AMPLIFIER

INSTRUCTION MANUAL

Installation

Accessories

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Part name

External View Number of Items

Self-tapping screws

(ø5 × 18 mm)

Hexagon socket head cap screw

(M4 × 8 mm)

Cover

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Terminal cover (Power terminal)

Hexagon Wrench

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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 wires of the units.

4.Connect the speaker wires.

5.Connect the power wire, power control wire and grounding wire following this

order.

6.Install the installation fittings in the unit.

7.Attach the unit.

8.Install the terminal cover.

Hexagon Wrench

Cooling fan

Hexagon socket

head cap screw

(M4 × 8 mm)

Duct

9.Connect the negative - terminal of the battery.

2CAUTION

• Do not install in the below locations;

(Unstable location, In a location that interferes with driving, In a location

that gets wet, In a dusty location, In a place that gets hot, In a place that

gets direct sunlight, In a location that gets hit by hot air)

• 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.

Cooling fan

• This unit has cooling fans to decrease the internal temperature. Do not

mount the unit in a place where the cooling fan and ducts of the unit are

blocked. 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.

Cover

Installation board, etc.

(thickness : 15 mm or more)

Self-tapping screw

(ø5 × 18 mm)

• 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.

English 3

* Commercially available parts

Connection

2WARNING

CENTER UNIT

(CD receiver, etc.)

To prevent fire caused by a short in the wiring,

connect a fusible link or breaker nearby the

battery’s positive terminal.

RCA cable*

RCA cable ground terminal

2CAUTION

• If sound is not output normally, immediately

turn power off and check connections.

• Be sure to turn the power off before changing

the setting of any switch.

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Power control wire

Left input

• If the fuse blows, check wires for shorts, then

replace the fuse with one of the same rating.

• Check that no unconnected wires or connectors

are touching the car body. Do not remove

caps from unconnected wires or connectors to

prevent short circuits.

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• Connect the speaker wires to appropriate

speaker connectors separately. Sharing the

negative wire of the speaker or grounding

speaker wires 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.

Right input

Lead terminal*

Right speaker

Terminal cover

Battery wire*

Protective Fuse*

Left speaker

 Bridged Connections

Speaker (Bridged)

Battery

Ground wire*

 LX-Bus connection

To KENWOOD disc changer/

External optional accessory

Set the ID number of the Master amplifier to "0".

CENTER UNIT

You can connect up to 7 Slave amplifiers. Assign them ID numbers "1"

to "7" and do not duplicate them.

2CAUTION

• Do not connect 2 Master amplifiers to the Center Unit. If done, you

cannot control all amplifiers connected to the Center Unit.

• The LX AMP and the sensor unit cannot be connected

simultaneously. You must connect any of them at a time.

Control cable

(option)

Power control wire

NOTE

• The total length of S-video cables you can connect is 14 meters

(46 ft) maximum. If the cable length exceeds this limit, you cannot

control amps from the Center Unit.

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• If you assign the same ID number to multiple amplifiers, they

malfunction when you operate any of them from the Center Unit.

• If you assign ID number "8" or "9" to a Slave amplifier, it is not

recognized by the Center Unit.

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Master amplifier

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S-video cable*

RCA cable*

Extension wire*

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Slave amplifier 1

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Not more than

14m (46 ft)

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Slave amplifier 7

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4 English

Controls

KAC-X521/

KAC-PS521

KAC-X621/

KAC-PS621

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1 Fuse (KAC-X621/PS621 : 25 A × 3 , KAC-X521/PS521 : 30 A × 2)

2 Battery terminal

# Power indicator

Lights when the POWER switch is turned On.

The indicator flashes several seconds when the POWER switch is turned On

or when the Protection function is activated.

3 Ground terminal

4 Power control terminal

$ LPF FREQUENCY control

Controls the unit ON/OFF.

Sets the cutoff frequency when the "FILTER" switch is set to "LPF".

NOTE

% HPF FREQUENCY control

Controls the unit power. Be sure to connect it with all the systems.

Sets the cutoff frequency when the "FILTER" switch is set to "HPF".

5 Speaker output terminals

^ 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.

• 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 2Ω or greater.

When multiple speakers are to be connected, ensure that the combined

impedance is 2Ω or greater for each channel.

• OFF position:

The entire bandwidth is output without filtering.

• Bridged Connections:

When you wish to use the unit as a high-output monaural amplifier,

bridged connections are used. (Make connections to the LEFT channel 9

and the RIGHT channel · SPEAKER OUTPUT terminals.)

The speakers to be connected should have an impedance of 4Ω or greater.

When multiple speakers are to be connected, ensure that the combined

impedance is 4Ω or greater.

• 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 switched to monaural (L+R).

& AMP CONT (amplifier control) switch

Used to bypass the circuit when you do not control the sound with the

Amplifier Control.

2CAUTION

The rated input of the speakers should be no less than the maximum output

of the amplifier. Otherwise malfunction may result.

• ON position:

Allows you to control the sound with the Amplifier Control.

• OFF position:

6 RCA cable ground lead terminal

When using an RCA cable with a ground lead attached, connect the ground

lead to this terminal.

Bypasses the Amplifier Control circuit.

NOTE

7 ID NUMBER switch

Amplifier control is possible even while OFF.

Sets an amp identification number (ID) to be used for amplifier control from

the Center Unit.

* ISF (infrasonic filter) switch

When this switch is "ON", the frequencies which are below the audible

range and therefore inaudible are cut off so that the quality of the audible

frequencies can be improved.

Assign ID Number "0" to an amplifier when you use it as the Master amplifier.

Assign ID Numbers "1" to "7" to amplifiers when you use them as Slave

amplifiers. Do not duplicate these numbers.

( OPERATION switch

NOTE

This switch is used to select the operation mode of the amplifier.

After you have changed ID numbers of amplifiers, turn Off the POWER switch

of the Center Unit and turn it On again.

• 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.)

8 TO H/U terminal

After you have set the Master amplifier, connect it to the Center Unit.

9 REMOTE terminals

Used to connect to Slave amplifiers.

) INPUT SENSITIVITY control

0 RESET button

Set this control according to the pre-output level of the center unit

connected with this unit.

Resets the microprocessor of the unit.

NOTE

The values you have set with the Amplifier Control are NOT reset.

For the pre-output level, refer to the "Specifications" in the instruction manual

of the center unit.

! LINE IN terminal

@ LINE OUT terminal

The signal that’s input from the line input terminal is output.

English 5

Amplifier Control System

Indicator

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Display mode

4 Exit Menu mode

Press the [MENU] button for at least 1 second.

You can set up the display items as follows:

NOTE

1 Enter Menu mode

When you hold down the [3] button 3 or more seconds during ID number

display ("AMP"), message "MEMO" is displayed and you can register the values

you have set with the Amplifier Control. To call the Amplifier Control’s values,

hold down the [2] button 3 or more seconds during ID number display

("AMP"). Then, you can recall the value when message "LOAD" is displayed.

Press the [MENU] button.

"VOLT"/"CURR"/"TEMP"/"FAN" is displayed.

2 Select a display item

Press the [2] or [3] button.

The display items are switched in the following sequence.

Display

"VOLT"

"CURR"

"TEMP"

"FAN"

Information

Indicates the source voltage (V).

Indicates the current consumption (A).

Indicates the internal temperature (°F/°C).

Indicates the rotation speed of the cooling fan in 3 steps: "FAST", "SLOW" or "OFF".

Default

Resets all values you have set to the initial (default) values.

1 Enter Menu mode

Press the [MENU] button.

2 Select Default mode

Press the [MENU] button.

Select the "DEFA" display.

3 Exit Menu mode

Press the [MENU] button for at least 1 second.

NOTE

3 Resets the value to its default

Press the [3] button for at least 2 seconds.

Message "----" is displayed, and the value is initialized.

When the internal temperature is -22°F/-30°C or less, "-22F"/"-30C" is

displayed.

4 Exit Menu mode

Separate Amp Control

Press the [MENU] button for at least 1 second.

NOTE

You can control sounds using the Amplifier Control function of the unit.

Volume offset value can not be initialized.

1 Enter Menu mode

Press the [MENU] button.

Display Demonstration

2 Select the Menu item

Press the [MENU] button.

The "VOLT"/"CURR"/"TEMP"/"FAN" items are displayed repeatedly.

The setup items are displayed approximately 1 second first, then the set

values are displayed.

Press the [MENU] button for at least 2 seconds.

The indicator flashes in the Demonstration mode.

3 Adjust the Menu item

Canceling the Demonstration mode

Press any button to cancel the Demonstration mode.

Press the [2] or [3] button.

The setup items and set values are switched as follows.

Display Range

Adjustment Item

"VOLT"/"CURR"/"TEMP"/"FAN"

"BASS" 60/80/100/200 (Hz)

For the operation method refer to 'Display mode'

Bass Center Frequency

"BA G"

"BA Q"

B–15 — B+15 (dB)

Q1.00/Q1.25/Q1.50/Q2.00 Bass Q Factor

Bass level

When the bass extend is set to ON, low frequency response is

" EXT"

ON/OFF

extended by 20%.

Treble Center Frequency

Treble level

"TREB"

"TR G"

"VOL"

10/12/15/17 (kHz)

T–15 — T+15 (dB)

–20 — 0 (dB)

Volume offset

FAHR (Fahrenheit) or

CELS (Centigrade)

The Fahrenheit or Centigrade temperature unit can be selected for

the Display mode.

"TEMP"

"DEFA"

"AMP"

For the operation method refer to 'Default'

The ID Number you have assigned is displayed.

0 — 7

6 English

Control an Amp from Center Unit

Messages that may be displayed on the Center Unit

You can control the sound by controlling amplifiers from the Center Unit.

When you are selecting an item with the Amp Control, an error status of the

amplifier is displayed on the Center Unit.

1 Enter AMP Control mode

Select the AMP Control mode by following the 'AMP Control' procedure

given on the Operation Manual of the Center Unit.

Display

"AMP × E-01"/"AMP × COND E-01" When the inside of the unit is overheating.

When the unit has failed and direct current voltage is generated

Informations

NOTE

to the speaker’s output.

Use the set item and value operation buttons by following the instructions

given on the Operation Manual of the Center Unit.

"AMP × E-02"/"AMP × COND E-02"

NOTE

Turn the POWER switch Off and release the protection. If the error

message continues, consult to the KENWOOD’s dealership.

2 Select an amp number to operate

Operate the desired set item with the Center Unit.

Select the "AMP NO"/"AMP CONTROL NO" display.

When the speaker cord is shorted.

When the speaker output is in contact with the vehicle ground.

When you use the Amp Control in the Standby mode.

"AMP × E-03"/"AMP × COND E-03"

NOTE

"AMP OFF"

When the Center Unit is in the STANDBY mode, message "AMP OFF" is

displayed and you cannot operate the set items.

NOTE

Number "×" on the display indicates the amp’s ID number.

3 Set an ID number of Amp to operate

Set an amp’s ID number on the Center Unit.

You can select an ID number of "0" to "7" of connected amps.

4 Select the AMP Control item for adjustment

Select the desired set item on the Center Unit.

5 Adjust the AMP Control item

You can set a value of each item on the Center Unit.

The set items and their values are switched and displayed as follows.

Display

"VOLT"/"CURR"/"TEMP"/"FAN"

"VOLT"

Range

Adjustment Item

The amp state is displayed.

Indicates the source voltage (V).

Indicates the current consumption (A).

Indicates the internal temperature (°F/°C).

Indicates the rotation speed of the cooling fan in 3

steps: "FAST", "SLOW" or "OFF".

"CURR"

"TEMP"

"FAN"

"BAS F"/"BASS FREQ"

"BAS G"/"BASS GAIN"

"Q FA"/"Q FACTOR"

"EXT"/"BASS EXT"

60/80/100/200 (Hz)

–15 — +15 (dB)

Q1.00/Q1.25/Q1.50/Q2.00 Bass Q Factor

Bass Center Frequency

Bass level

ON/OFF

When the bass extend is set to ON, low frequency

response is extended by 20%.

"TRE F"/"TREB FREQ"

"TRE G"/"TREB GAIN"

"VOL"/"VOL OFFSET"

10/12/15/17 (kHz)

–15 — +15 (dB)

–20 — 0 (dB)

0 — 7

Treble Center Frequency

Treble level

Volume offset

"AMP NO"/

Select an ID number of the amp you use.

"AMP CONTROL NO"

6 Exit AMP Control mode

Releases the Amp Control mode by the Center Unit.

NOTE

When you have controlled the bass or treble of the sound using the

Equalizer or DSP function of the Center Unit, and when you amplify the same

frequency as that controlled by the Amplifier Control, the sound may be

distorted due to an input overflow.

English 7

System examples

 2-channel system

 High-power 2-channel subwoofer system

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Left subwoofer (Bridged)

Right subwoofer (Bridged)

Left speaker

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CENTER UNIT

Right speaker

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 2-channel + Subwoofer system

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Left speaker (High pass)

Right speaker (High pass)

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Subwoofer

(L + R)

(Bridged)

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 Tri-mode

Principle of Tri-mode

Method of frequency band division using a coil and capacitor…in case of 6dB/oct. slope.

Subwoofer

(L + R) (Bridged)

(High pass)

Coil (L):

Crossover Frequency

Passes low frequencies and blocks high

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0 dB

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frequencies. (Low pass)

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-3 dB

CENTER UNIT

Capacitor (C):

Passes high frequencies and blocks low

frequencies. (High pass)

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Frequency

159000

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159 x R

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fc=Cut of Frequency (Hz)

R=Speaker Impedance (Ω)

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(mH)

(µF)

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fc × R

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Example:

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When it is required to set a crossover frequency of 120 Hz using speakers with an

impedance of 4 ohms.

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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).

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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.

8 English

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.

• Input (or output) cables are disconnected.

• Protection circuit may be activated.

• Volume is too high.

• Connect the input (or output) cables.

• Check connections by referring to "Protection function".

• Replace the fuse and use lower volume.

• After check the speaker cord and fixing the cause of the short,

replace the fuse.

(No sound from one side.)

(Blown fuse.)

• The speaker cord is shorted.

The output level is too small • The input sensitivity adjusting control is not set to the correct • Adjust the control correctly referring to "Controls".

(or too large).

position.

The sound quality is bad.

(The sound is distorted.)

• The speakers wire are connected with wrong + /-polarity.

• Connect them properly checking the + / - of the terminals

and wires well.

• A speaker wire is pinched by a screw in the car body.

• Connect the speaker wire again so that it is not pinched by

anything.

• The switches may be set improperly.

• The AMP CONT has been turned "OFF".

• Set switches properly by referring to "System examples".

• Turn the AMP CONT "ON".

The sound does not change

even when you have changed • The filtered band has been controlled by the Amplifier Control. • Turn the filter Off.

it with the Amplifier Control.

The set value cannot be

changed by the Amplifier

Control of the unit.

• The AMP Control of the Center Unit is being used.

• Release the AMP Control mode of the Center Unit.

The Amplifier Control cannot • An incorrect ID number is used for the Master amplifier.

be operated from the Center • The ID number of the amplifier has been changed.

Unit.

• Always set the ID number of the Master amplifier to "0".

• After you have changed the ID number of an amplifier, turn Off

the POWER switch of the Center Unit first, then turn it On again.

Specifications

Specifications subject to change without notice.

Audio Section........................................................................................................................KAC-X621 KAC-X521

RMS Power Output (+B = 14.4 V, CEA-2006)

Normal (4 Ω/2ch) (1.0 % THD+N)........................................................................................................................................... 179 W 165 W

Normal (2 Ω/2ch) (1.0 % THD+N)........................................................................................................................................... 305 W 254 W (1 kHz)

Bridged (4 Ω) (1.0 % THD+N).................................................................................................................................................... 612 W 505 W × 1

Dynamic Power (+B = 14.4 V, CEA-2006) .......................................................................................................................................... 191 W 170 W

Output Regulation (+B = 14.4 V, CEA-2006)..........................................................................................................under 0.3 dB (4 Ω) under 0.3 dB (4 Ω)

Signal to Noise Ratio (CEA-2006).......................................................................................................................................83 dBA (W/4 Ω) 81 dBA (W/4 Ω)

Signal to Noise Ratio (Bypass) (CEA-2006) ...................................................................................................................83 dBA (W/4 Ω) 82 dBA (W/4 Ω)

Sensitivity (rated output) (MAX.) ..............................................................................................................................................................0.2 V 0.2 V

Sensitivity (rated output) (MIN.) ...............................................................................................................................................................5.0 V 5.0 V

Input Impedance ............................................................................................................................................................................................ 10 kΩ 10 kΩ

Low Pass Filter Frequency (24 dB/oct.) .............................................................................................................50 – 200 Hz (variable) 50 – 200 Hz (variable)

High Pass Filter Frequency (12 dB/oct.)............................................................................................................50 – 200 Hz (variable) 50 – 200 Hz (variable)

Infrasonic Filter Frequency (24 dB/oct.).............................................................................................................................................. 15 Hz 15 Hz

Frequency Response (+0, –3 dB)...........................................................................................................................................5 Hz – 70 kHz 5 Hz – 70 kHz

Audio Section......................................................................................................................KAC-PS621 KAC-PS521

Max Power Output......................................................................................................................................................................................1200 W 1000 W

Rated Power Output (+B = 12.0 V)

Normal (4 Ω) (20 Hz – 20 kHz, 0.05 % THD)..............................................................................................................100 W × 2 80 W × 2

Normal (2 Ω) (1 kHz, 0.5 % THD).....................................................................................................................................200 W × 2 160 W × 2

Bridged (4 Ω) (1 kHz, 0.5 % THD)....................................................................................................................................400 W × 1 320 W × 1

Rated Power Output (+B = 14.4 V)

Normal (4 Ω) (20 Hz – 20 kHz, 0.05 % THD)..............................................................................................................150 W × 2 125 W × 2

Normal (4 Ω) (DIN : 45324 , +B = 14.4V).....................................................................................................................150 W × 2 125 W × 2

Normal (2 Ω) (1 kHz, 0.5 % THD).....................................................................................................................................300 W × 2 250 W × 2

Bridged (4 Ω) (1 kHz, 0.5 % THD)....................................................................................................................................600 W × 1 500 W × 1

Low Pass Filter Frequency (24 dB/oct.) .............................................................................................................50 – 200 Hz (variable) 50 – 200 Hz (variable

High Pass Filter Frequency (12 dB/oct.)............................................................................................................50 – 200 Hz (variable) 50 – 200 Hz (variable)

Infrasonic Filter Frequency (24 dB/oct.).............................................................................................................................................. 15 Hz 15 Hz

Signal to Noise Ratio...................................................................................................................................................................................105 dB 105 dB

Amplifier Control Section (EQ) ................................................................................KAC-X621/PS621 KAC-X521/PS521

Bass frequency .............................................................................................................................................................. 60 / 80 / 100 / 200 Hz 60 / 80 / 100 / 200 Hz

Bass level ........................................................................................................................................................................................... -15 — +15 dB -15 — +15 dB

Bass Q factor.................................................................................................................................................................1.00 / 1.25 / 1.50 / 2.00 1.00 / 1.25 / 1.50 / 2.00

Treble frequency ............................................................................................................................................................. 10 / 12 / 15 / 17 kHz 10 / 12 / 15 / 17 kHz

Treble level ....................................................................................................................................................................................... -15 — +15 dB -15 — +15 dB

General ......................................................................................................................KAC-X621/PS621 KAC-X521/PS521

Operating Voltage ........................................................................................................................................... 14.4 V (11 – 16 V allowable) 14.4 V (11 – 16 V allowable)

Current Consumption (+B = 12.0 V, 1 kHz, 10 % THD, 4 Ω).........................................................................................................40 A 37 A

Dimensions (W × H × D) ..........................................................................................................................................446 × 61 × 259.5 mm 386 × 61 × 259.5 mm

.............................................................................................................................................................. 17-5/8 × 2-3/8 × 10-3/16 inch 15-3/16 × 2-3/8 × 10-3/16 inch

Installation Size (W × H × D) ..................................................................................................................................... 446 × 61 × 265 mm 386 × 61 × 265 mm

................................................................................................................................................................. 17-5/8 × 2-3/8 × 10-3/8 inch 15-3/16 × 2-3/8 × 10-3/8 inch

Weight .......................................................................................................................................................................................... 4.42 kg (9.74 lbs) 3.83 kg (8.44 lbs)

English 9

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