KAC-7404 KAC-6404
4/3/2 CHANNEL POWER AMPLIFIER 7 page 2-9

INSTRUCTION MANUAL

AMPLIFICATEUR DE PUISSANCE 4/3/2 CANAUX 7 page 10-17

MODE DEMPLOI

AMPLIFICADOR DE POTENCIA DE 4/3/2 CANALES 7 pgina 18-25

MANUAL 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-7404, KAC-6404 Serial number

US Residence Only

Register Online
Register your Kenwood product at www.Kenwoodusa.com

B64-3922-00/00 (KV/EV)

Safety precautions

2WARNING

To prevent injury or fire, take the following precautions:
When extending the ignition, battery, or ground wires, make sure to use automotive-grade wires or other wires with a 5 mm (AWG 10) or more to prevent wire deterioration and damage to the wire 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. Mounting and wiring this product requires skills and experience. For safetys sake, leave the mounting and wiring work to professionals.
To prevent battery from running out
When the unit is used in the ACC ON position without turning the engine ON, it depletes the battery. Use it after starting the engine.

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. 2 CAUTION 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.

Protection function

The protection function is activated in the following situations: This unit is equipped with a protection function for protecting this unit and your speakers from various accidents or problems that can occur. When the protection function is triggered, the Power indicator goes off and the amplifier stops operating. When a speaker wire may be short-circuited. When a speaker output contacts ground. When the unit malfunctions and a DC signal is sent to the speaker output. When the internal temperature is high and unit wont operate. When a ground wire of the center unit (cassette receiver, CD receiver, etc.) or this unit is not connected to a metal part serving as an electrical ground passing electricity to the battery's negative - terminal.

2CAUTION

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 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. 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.

2 English

Installation

Accessories

Part name

330 mm 236 mm 4.6

External View

Number of Items 1

Self-tapping screws (mm) Terminal cover (Power terminal)

218.4 mm

230 mm
Speaker level input cable
Self-tapping screw (mm) Cooling fan (KAC-7404) Cooling fan (KAC-7404)
Installation board, etc. (thickness : 15 mm or more)
2 CAUTION 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. This unit has cooling fan 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. 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

Controls

40W 15W

1 A ch FILTER switch
This switch allow filtering of the speaker output signals.
4 B ch LPF FREQUENCY control
Sets the cutoff frequency when the "B ch FILTER" switch is set to "LPF".

OFF position:

The original sound without filtering is output.

5 Power indicator

When the power is turned on, the Power indicator lights. If the Power indicator does not light when the power is turned on, the protection function may be activated. Check whether there is any indication of trouble. Refer to <Protection function> (page 2).
HPF (High Pass Filter) position:
Only frequencies of 80 Hz or higher are output. (Frequencies below 80 Hz are cut.)

2 B ch FILTER 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 gain is enhanced.
3 INPUT SENSITIVITY control (A.ch/ B.ch)
Set this control according to the pre-output level of the center unit connected with this unit, or to the maximum power output of the genuine-accessory car stereo. Use the diagram on the right as a guide. The sensitivities of amplifiers A and B can be adjusted independently.

4 English

Connection

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. Connect the negative - terminal of the battery. 2 WARNING To prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the batterys positive terminal.

Wiring

Take the battery wire for this unit directly from the battery. If it's connected to the vehicles wiring harness, it can cause blown fuses etc. 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 wire. Do not allow the wire to directly contact the edge of the iron plate by using Grommets. Connect the ground wire 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 wire is not connected. Be sure to install a protective fuse in the power cord near the battery. The protective fuse should be the same capacity as the units fuse capacity or somewhat larger. For the power cord and ground, use a vehicle type (fireproof ) power wring cord with a current capacity greater than the units fuse capacity. (Use a power wiring cord with a diameter of 5 mm (AWG 10) or greater.) 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.

2 CAUTION 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. 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. 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.

Speaker selection

The input power of the speakers that are going to be connected should be greater than the 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.

Combined impedance

RCA cable or Speaker level input connection RCA cable connections
RCA cable* CENTER UNIT (CD receiver, etc.)
Power control wire (Blue/ White)
A channel input B channel input
Speaker level input connections
Cable Color of the connector A channel 9 White White/Black Left A channel 9 Gray Gray/Black Right B channel 9 Green Green/Black Left B channel 9 Purple Purple/Black Right
Genuine-accessory car stereo (No line output center unit etc.) Speaker level input cable Car fuse box

Battery ACC

Do not connect cables and leads to both RCA cable input jacks and the speaker level input terminals simultaneously, for this may cause malfunction or damage.
Speaker level input terminals
The genuine-accessory car stereo shall have a maximum power output of no more than 40 W. Connect the power control lead to a power supply which can be turned ON/OFF by the ignition key switch (ACC line). With this connection, pop noise may be generated when the power of the genuine-accessory car stereo is switched ON/OFF.
combined impedance is 2 or greater for each channel. Bridged Connections: Make connections to the LEFT channel 9 and the RIGHT channel SPEAKER OUTPUT terminals. 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.

Power control terminal

Controls the unit ON/OFF.
Controls the unit power. Be sure to connect it with all the systems.
Speaker output terminals (A.ch/ B.ch)

Stereo Connections: The speakers to be connected should have an impedance of 2 or greater. When multiple speakers are to be connected, ensure that the
KAC-7404: 40 A 1 KAC-6404: 25 A 1

6 English

* Commercially available parts
Speaker wire connection Stereo Connections
A channel Left speaker Lead terminal* A channel Right speaker
B channel Right speaker B channel Left speaker

Bridged Connections

A channel Speaker (Bridged)
B channel Speaker (Bridged)

Power wire connection

KAC-6404

Terminal cover

Power control wire*

Battery wire*

KAC-7404 Lead terminal*

Ground wire*

Protective Fuse* Battery 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
No sound. (No sound from one side.) (Blown fuse.)

POSSIBLE CAUSE

Input (or output) cables are disconnected. Protection circuit may be activated.

SOLUTION

Connect the input (or output) cables.
The output level is too small (or too large). The sound quality is bad. (The sound is distorted.)
Check connections by referring to <Protection function>. Volume is too high. Replace the fuse and use lower volume. The speaker cord is shorted. After check the speaker cord and fixing the cause of the short, replace the fuse. The input sensitivity adjusting control Adjust the control correctly referring to is not set to the correct position. <Controls>. The speakers wire are connected with Connect them properly checking the wrong 9 / polarity. 9 / of the terminals and wires well. A speaker wire is pinched by a screw Connect the speaker wire again so that in the car body. it is not pinched by anything. The switches may be set improperly. Set switches properly by referring to <Controls>.

Specifications

CEA-2006... KAC-7404 KAC-6404
Primary Power Output Ratings (RMS Watts per channel @ 4 ohms, 1 % THD+N).. 60 W W 4 Signal to Noise Ratio (Reference: 1Watt into 4 ohms).. 80 dBA 80 dBA

Audio Section... KAC-7404 KAC-6404
Max Power Output...720 W (180 W 4) Rated Power Output Normal (4 ) (20 Hz 20 kHz, 1 % THD).. 60 W 4 Normal (4 ) (DIN : 45324 , +B = 14.4V).. 60 W 4 Normal (2 ) (1 kHz, 1 % THD)... 90 W 4 Bridged (4 ) (1 kHz, 1 % THD)...180 W 2 Frequency Response (+0, 3 dB)... 5 Hz 50 kHz Sensitivity (rated output)...0.2 V 5.0 V Signal to Noise Ratio....94 dB Input Impedance.... 10 k Low Pass Filter Frequency (-12 dB/oct.)..Hz (variable) High Pass Filter Frequency (-12 dB/oct.)...80 Hz Operating Voltage... 14.4 V (V allowable) Current Consumption.... 36 A Dimensions (W H D)...230 mm... 13 2-5/16 9-1/16 inch Weight....2.9 kg (6.4 lbs)
Specifications subject to change without notice.
500 W (125 W 4) 40 W W W W Hz 50 kHz 0.2 V 5.0 V 94 dB 10 k Hz (variable) 80 Hz 14.4 V (V allowable) 19 A 230 mm 13 2-5/16 9-1/16 inch 2.7 kg (5.9 lbs)
General... KAC-7404 KAC-6404

8 English

FCC WARNING
This equipment may generate or use radio frequency energy. Changes or modifications to this equipment may cause harmful interference unless the modifications are expressly approved in the instruction manual. The user could lose the authority to operate this equipment if an unauthorized change or modification is made.
Declaration of Conformity with regard to the EMC Directive 2004/108/EC

Manufacturer:

Kenwood Corporation 2967-3 Ishikawa-machi, Hachioji-shi, Tokyo, 1928525 Japan

EU Representative's:

Kenwood Electronics Europe BV Amsterdamseweg 37, 1422 AC UITHOORN, The Netherlands

FCC NOTE

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment may cause harmful interference to radio communications, if it is not installed and used in accordance with the instructions. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help.

Information on Disposal of Old Electrical and Electronic Equipment (applicable for EU countries that have adopted separate waste collection systems)
Products with the symbol (crossed-out wheeled bin) cannot be disposed as household waste. Old electrical and electronic equipment should be recycled at a facility capable of handling these items and their waste byproducts. Contact your local authority for details in locating a recycle facility nearest to you. Proper recycling and waste disposal will help conserve resources whilst preventing detrimental effects on our health and the environment. This product is not installed by the manufacturer of a vehicle on the production line, nor by the professional importer of a vehicle into an EU Member State.