Kenwood KAC-744 Instruction Manual

To install the Kenwood KAC-744 amplifier, follow these steps:

1. Before starting installation, disconnect the terminal of the battery. This prevents short circuits.
2. Connect the Input and Output leads.
3. Connect the Ground lead to the metal body of the car.
4. Connect the Power lead.
5. Install the unit in the car, securing it in a location that allows heat to dissipate and does not interfere with driving.
6. Connect the negative terminal of the battery.

Ensure that no unconnected wires or connectors are in contact with the car body, as this can cause malfunction or damage. If a buzzing noise is heard from the speakers when the engine is running, attach a line noise filter to the power leads.

If your Kenwood KAC-744 amplifier is not working, consult the troubleshooting guide:

• No sound or no sound from one side: Check the speaker cord connections.
• The level is too low (or high): Adjust the input sensitivity adjusting knob to the correct position.
• The sound quality is bad (distorted):
  1. Connect each speaker terminal to its respective speaker output.
  2. Check the speaker wiring.

You can adjust the gain settings using the Input sensitivity control. This control should be adjusted according to the pre-out level of the center unit connected to the amplifier. The amplifier's input sensitivity ranges from 0.3 V (MAX) to 3.0 V (MIN).

Yes, the Kenwood KAC-744 amplifier can be configured in various ways:

• Two KAC-744 units can be used as 2-channel amplifiers to create a high power 4-channel amplifier.
• It can be used in a multi-amp system with a single unit, sending output through high-pass or low-pass filters for different frequency speakers.
• It supports a TRI-MODE configuration which allows adding a subwoofer to a stereo 4-channel speaker system by using coils and capacitors.

The technical specifications for the Kenwood KAC-744 amplifier are:

• Max Power Output (4Ω):
  • 4 Channel Mode: 80 W x 4
  • 3 Channel Mode: 80 W x 2 + 160 W
  • 2 Channel Mode: 160 W x 2
• Rated Power Output (4Ω):
  • 4 Channel Mode: 40 W x 4 (20 Hz-20 kHz, less than 0.08% THD)
  • 3 Channel Mode: 40 W x 2 (1 kHz, 0.08% THD) + 110 W x 1 (1 kHz 0.8%)
  • 2 Channel Mode: 110 W x 2 (1 kHz, 0.8% THD)
• Rated Power Output (2Ω):
  • 4 Channel Mode: 55 W x 4 (1 kHz, 0.8% THD)
• Frequency Response: 2 Hz-45 kHz (-3 dB)
• Signal to Noise Ratio: 100 dB
• Sensitivity (MAX.): 0.15 V (rated output)
• Sensitivity (MIN.): 3.0 V (rated output)
• Input Impedance: 10 kΩ
• Damping Factor (100 Hz): More than 100
• High Pass Filter Frequency: 80 Hz (12 dB/oct.)
• Low Pass Filter Frequency: 80 Hz (12 dB/oct.)
• Operating Voltage: 14.4V (11~16 V allowable)
• Current Consumption (1 kHz, 10% THD): 25 A
• Dimensions (W x H x D): 280 x 50 x 230 mm
• Weight: 3.0 kg

The Kenwood KAC-744 amplifier is compatible with speakers that have a combined impedance of at least 2 ohms. An impedance lower than 2 ohms can damage the amplifier.

You can connect external audio sources, such as a cassette receiver or graphic equalizer, to the Kenwood KAC-744 amplifier using RCA cables. The amplifier has Left (Mono) input (White) and Right input (Red) terminals for both Amplifier A and Amplifier B. You will also need to connect the power control lead from your center unit to the amplifier's power control terminal.

The Kenwood KAC-744 is a 4-channel amplifier. It includes two stereo amplifiers within one unit, referred to as Amplifier A and Amplifier B.