Kenwood KAC-748

35 x 4 Car Amplifier

  • Kenwood KAC-748


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Item #: 113KAC748
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Our take on the Kenwood KAC-748


My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Kenwood's KAC-748 4-channel amp features variable high-pass and low-pass crossovers (50-200 Hz), front and rear. You'll get the best possible sound from your system by sending just the right frequencies to each speaker. And you'll have multiple hookup options. Drive 2 pairs of stereo speakers, or bridge the 2 rear channels to power your subwoofer, and use the 2 front channels for your main stereo pair.

This 4-channel Kenwood is built with MOSFET-switching power supplies for fast response, maximum output, and cooler operating temperatures. Larger-than-usual noise-suppression filters make sure that all you hear is music. Speaker-level inputs allow easy connection to any head unit.

  • 2-, 3-, 4-channel, or Tri-Way output
  • 100 watts x 2 in bridged mode
  • 50 watts x 4 at 2 ohms
  • requires 10-gauge power and ground leads — wiring and hardware not included with amplifier
  • anti-thump circuit for quiet turn-on
  • speaker short, thermal overload, and DC protection
  • extra-large toroidal noise filters
  • speaker-level inputs
  • gold-plated preamp outputs
  • 50-200 Hz variable high-pass/low-pass crossovers, individually-selectable on front and rear channels, 12 dB/octave
  • 11-5/8"W x 2-1/4"H x 12-5/8"D
  • 1-year warranty
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Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
RMS Power Output (Watts x Channels) 35 x 4
Peak Power Output (Watts x Channels) 70 x 4
Power at 2 Ohms (Watts x Channels) 50 x 4
Bridged Power (Watts x Channels) 100 x 2
Minimum Impedance Bridged 4
Minimum Impedance Unbridged 2
Best Frequency Response 5-50k Hz
THD at Rated RMS Power 0.08%
Signal to Noise Ratio 100 dB
Input Voltage 14.4v
Amplifier Class AB
Low-Pass Crossover Frequency 50-200 Hz
Low-Pass Slope (dB/octave) 12 dB
High-Pass Crossover Frequency 50-200 Hz
High-Pass Slope (dB/octave) 12 dB
Bass Boost No
Bass Boost Frequency N/A
Fan Cooled No
Fuse Rating 30 x 1
Speaker Level Inputs Terminal Strip (Go
Preamp Outputs 1 pair Gold RCA
Width (inches) 11-5/8
Height (inches) 2-1/4
Depth (inches) 12-5/8
Parts Warranty 1 YEAR
Labor Warranty 1 YEAR
Product Research
What's in the box?

Download owner's manual

  • Black amplifier with silver trim; 30-amp blade fuses; Rubber terminal cover; 4 self-tapping mounting screws; Warranty card; Instructional manual (English/Spanish/French)

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Inputs and Outputs


Rated power output at 2 ohms: 50 W x 4 (1 kHz, 0.8% THD)

Max power output at 4 ohms: 70 W x 4 

Max power output at 4 ohms, bridged: 200 W X 2

Input impedance: 10 kohms

Operating voltage: 14.4 V (11-16V allowable)

Current consumption (1 kHz, 10% THD): 28A


Protection circuitry:

  • Speaker output contacts ground
  • Unit malfunctions and DC is sent to speaker output
  • Thermal: when internal temp exceeds 248 degrees F
  • Loss of ground of headunit or amp


  • Crossover frequency controls: One for A, one for B; variable from 50-200 Hz
  • Filter controls: One for A, one for B; each one can be set for high pass, OFF, or low pass
  • Operation controls: One for A, one for B; each one can be set for stereo, L+R combined or mono (L channel)
  • Input selector: You can select A/B position when using a source unit with dual RCA outputs or A position with amplifies any signal input to the "A" by both A and B (so an RCA "Y" adapter is not needed).
  • Input sensitivity knobs (variable from min to 4V): One for A and one for B

Inputs and Outputs

  • GND screw
  • Gold plated strip terminal: For power, ground and remote turn on
  • Gold plated terminal strip: For front and rear; left and right loudspeakers (bridged = Left+ and Right-)
  • Gold plated terminal strip: For speaker level input for front and rear; left and right loudspeakers.
  • Gold plated RCA stereo input for A
  • Gold plated RCA stereo input for B
  • Gold plated RCA stereo output for A+B (note that this output is always stereo, even when the amp is set to mono mode)
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