KENWOOD XR401-4, XH401-4 Class D Four Channel Power Amplifier Instruction Manual

June 2, 2024
KENWOOD

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KENWOOD XR401-4, XH401-4 Class D Four Channel Power Amplifier

KENWOOD-XR401-4,-XH401-4-Class-D-Four-Channel-Power-Amplifier-
PRODUCT

Accessories

KENWOOD-XR401-4,-XH401-4-Class-D-Four-Channel-Power-
Amplifier-FIG 1

Dimensions

KENWOOD-XR401-4,-XH401-4-Class-D-Four-Channel-Power-
Amplifier-FIG 2

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 XR401-4/XH401-4 Serial number

Safety precautions

WARNING

To prevent injury or fire, take the following precautions:

  • Mounting and wiring this product requires skills and experience. For safety’s sake, leave the mounting and wiring work to professionals.
  • When extending the ignition, battery, or ground wires, make sure to use automotive-grade wires or other wires with the range of 14 mm2 (AWG 6) to 21 mm2 (AWG 4) 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.

CAUTION

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.
  • 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.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.

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
If the front panel gets dirty, turn off the power and wipe the panel with a dry silicon cloth or soft cloth.

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.
To prevent battery rise
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.

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 won’t operate.

Wiring

  • Take the battery wire for this unit directly from the battery. If it’s connected to the vehicle’s 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 battery‘s 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 unit’s fuse capacity or somewhat larger.
  • For the power cord and ground, use a vehicle type (fireproof) power wring cord. (Use a power wiring cord with the range of 14 mm2 (AWG 6) to 21 mm2 (AWG 4).
  • 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.

Speaker selection

  • Using speakers with smaller input ratings than the amplifier’s output power would result in smoke generation or equipment failure.
  • The impedance of the speakers that are going to be connected should be 2Ω or greater (for stereo connections), or 4Ω 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.
![KENWOOD-XR401-4,-XH401-4-Class-D-Four-Channel-Power-Amplifier-FIG 3](https://manuals.plus/wp-content/uploads/2022/12/KENWOOD- XR401-4-XH401-4-Class-D-Four-Channel-Power-Amplifier-FIG-3.png)

Installation

KENWOCOD-XR401-4,-XH401-4-Class-D-Four-Channel-Power-
Amplifier-FIG 4

Installing the remote controller (④ Parts included)KENWOOD-
XR401-4,-XH401-4-Class-D-Four-Channel-Power-Amplifier-FIG
5

  1. Remove the panel of the vehicle.
  2. Drill a 8 mm (5/16”) hole.
  3. Remove the knob, then insert the shaft through the drilled hole. Place the nut and washer and fix them.
  4. Place the knob on the shaft.
  5. Attach the panel.

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. Remove the Dressing cover.
  4. Connect the input and output wires of the units.
  5. Connect the speaker wires.
  6. Connect the power wire, power control wire and grounding wire following this order.
  7. Install the installation fittings in the unit.
  8. Attach the unit.
  9. Attach the Dressing cover.
  10. Connect the negative ⊖ terminal of the battery.

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.
  • 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.

Connection

WARNING

Particular attention must be given to making good electrical contact at the amplifier-output and speaker terminals. Poor or loose connections can cause sparking or burning at the terminals because of the very high power that the amplifier can deliver.

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, turn signal lamps and windshield wipers work properly. KENWOOD-XR401-4,-XH401-4-Class-D-Four-Channel-Power-Amplifier-FIG 13KENWOOD-XR401-4,-XH401-4-Class-D-Four-Channel-Power-Amplifier-FIG 6

About the Lead Terminals

Wire Thicknesses
You can use wires with the following thicknesses:

  • Battery wire and ground wire AWG 4 – AWG 6
  • Speaker wire AWG 8 – AWG 16

Strip the wire
Make a cut in the wire sheath (insulator made from vinyl, etc.) at the position 10–13 m (3/8”–1/2”) away from the end of the wire, and then remove the unnecessary portion of the sheath by twisting it.

Install the wire
Loosen the screw using the supplied hexagon wrench. Insert the conductor of the wire in the terminal hole, and then tighten the screwKENWOOD-
XR401-4,-XH401-4-Class-D-Four-Channel-Power-Amplifier-FIG
7

System examples

KENWOOD-XR401-4,-XH401-4-Class-D-Four-Channel-Power-
Amplifier-FIG 8 KENWOOD-
XR401-4,-XH401-4-Class-D-Four-Channel-Power-Amplifier-FIG
9

Information on Disposal of Old Electrical and Electronic Equipment (applicable for countries that have adopted separate waste collection systems)

Manufacturer:
JVCKENWOOD Corporation
3-12, Moriya-cho, Kanagawa-ku, Yokohama-shi, Kanagawa, 221-0022, JAPAN

EU Representative:
JVCKENWOOD Europe B.V.
Amsterdamseweg 37, 1422 AC Uithoorn,
THE NETHERLANDS

Information on Disposal of Old Electrical and Electronic Equipment (applicable for 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.

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.

(No sound from one side.)

(Blown fuse.)

| •   Input (or output) cables are disconnected.

•   Protection circuit may be activated.

•   Volume is too high.

•   The speaker cord is shorted.

| •   Connect the input (or output) cables.

•   Check connections by referring to

.

•   Replace the fuse and use lower volume.

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

The output level is too small (or too large).| •   The input sensitivity adjusting control is not set to the correct position.| •   Adjust the control correctly referring to

.

The sound quality is bad.

(The sound is distorted.)

| •   The speakers wire are connected with wrong  / polarity.

•   A speaker wire is pinched by a screw in

the car body.

•   The switches may be set improperly.

| •   Connect them properly checking the / of the terminals and wires well.

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

•   Set switches properly by referring to

.

Controls

Fuse exchange

Insert the tip of thin-nose pliers into the slit, grasp the fuse and pull it outKENWOOD-XR401-4,-XH401-4-Class-D-Four-Channel-Power-Amplifier-FIG
10KENWOOD-
XR401-4,-XH401-4-Class-D-Four-Channel-Power-Amplifier-FIG
12

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.

  1. Fuse (30 A x 2)
    NOTE
    If you can’t find the specified capacity fuse at your store etc., consult your KENWOOD dealer.

  2. Battery terminal (BATT.)

  3. Power control terminal (P.CON)
    Controls the unit ON/OFF.

  4. Ground terminal (GND)

  5. SPEAKER OUTPUT terminals (A.ch/B.ch)

    • 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.

    • Bridged connections:
      When you wish to use the unit as a high-output amplifier, bridged connections are used. (Make connections to the
      LEFT channel ⊕ 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.

  6. LINE IN terminal (A.ch/B.ch)

  7. INPUT SEL switch
    Selects the input audio signals.

    • A B position:
      The signals input to LINE IN A are output at SPEAKER OUTPUT A and those input to LINE IN B are output at SPEAKER OUTPUT B.

    • A position:
      The signals input to LINE IN A are output at both SPEAKER OUTPUT A and B.

  8. INPUT SENSITIVITY control (A.ch/B.ch)
    Set this control according to the pre-output level of the center unit connected with this unit.
    NOTE
    For the pre-output level, refer to the in the instruction manual of the center unit.

  9. FILTER FREQUENCY control (A.ch/B.ch)
    This control adjusts the frequency band output from this unit. The frequency range is set with the “FREQ. RANGE” switch.

  10. FILTER switch (A.ch/B.ch)
    This switch allow filtering of the speaker output signals.

    • HPF (High-Pass Filter) position:
      The filter outputs the band of higher frequencies than the frequency set with the “FILTER FREQUENCY” control.

    • OFF position:
      The entire bandwidth is output without filtering.

    • LPF (Low-Pass Filter) position:
      The filter outputs the band of lower frequencies than the
      frequency set with the “FILTER FREQUENCY” control.

  11. FREQ. RANGE switch (A.ch/B.ch)
    This switch selects the range of filter frequency.

  12. REMOTE terminal (B.ch)
    This terminal is an exclusive terminal for a supplied controller to adjust the volume of the B.ch output.

  13. Volume control knob (Remote controller)
    Adjust the volume of the B.ch output.

Specifications

Specifications subject to change without notice.
Audio section

  • Rated power output (+B = 14.4V)
  • Stereo (4 Ω) ……………………………….75 W × 4 (20 Hz – 20 kHz, ≤ 1.0 % THD)
  • Stereo (2 Ω) …………………………….. 100 W × 4 (1 kHz, ≤ 1.0 % THD)
  • Bridged (4 Ω) …………………………. 200 W × 2 (1 kHz, ≤ 1.0 % THD)
  • Speaker impedance …………………………. 4 Ω (2 Ω to 8 Ω allowable)
  • (Bridged connection: 4 Ω to 8 Ω allowable)
  • Frequency Response (+0, –1 dB) ………………………. 20 Hz – 40 kHz
  • Input sensitivity (RCA) ………………………………………………….. 0.2 V – 5.0 V
  • Signal to noise ratio ………………………………………………………………… 100 dB
  • Input impedance ………………………………………………………………………..10 kΩ Low pass filter frequency (-12 dB/oct.)
  • Low range ……………………………………………50 Hz – 200 Hz (variable)
  • High range ………………………………………..2.5 kHz – 10 kHz (variable) High pass filter frequency (-12 dB/oct.)
  • Low range ………………………………………50 Hz – 200 Hz (variable)
  • High range …………………………………..2.5 kHz – 10 kHz (variable)

General

  • Operating voltage ………………………….. 14.4 V (11 – 16 V allowable)
  • Current consumption …………………………………………………………………37 A
  • Dimensions (W × H × D) ……………………………..220 × 35 × 169 mm 8-11/16 × 1-3/8 × 6-5/8 inch
  • Weight ……………………………………………………………………………1.5 kg (3.3 lbs)

CTA-2006

  • RMS Watts per channel @ 4 Ohms, ≤ 1% THD+N ………………………………………………………………………………..75 W × 4 Signal to noise ratio
  • (Reference: 1Watt into 4 Ohms) ……………..76 dBA

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