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Kenwood KAC-9103D

Mono subwoofer amplifier
900 watts RMS x 1 at 2 ohms

10 Reviews

Item # 113KAC9103

This item is no longer available.

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Our take on the Kenwood KAC-9103D

Kenwood built the KAC-9103D amplifier from the ground up to power your subs with authority. Its rugged cast-aluminum chassis houses an efficient mono power amp that'll punch out up to 900 watts RMS without putting a strain on your car's electrical system.

Kenwood built the KAC-9103D amplifier from the ground up to power your subs with authority. Its rugged cast-aluminum chassis houses an efficient mono power amp that'll punch out up to 900 watts RMS without putting a strain on your car's electrical system.

A built-in low-pass filter adjusts amplifier output so you'll get the best sound possible from your subwoofer/box combo, while the subsonic filter eliminates inaudible, ultra-low bass that can hamper performance. You can dial in up to 18 dB of bass boost if you want to fatten up the sound.

The top-mounted controls allow you to tweak the sound easily, and convenient front-side connections make setup a snap. Speaker- and preamp-level inputs, plus preamp outputs, provide flexibility in system design and hookup.

Product Highlights:

  • mono subwoofer amplifier
  • 500 watts RMS x 1 at 4 ohms (900 watts x 1 at 2 ohms)
  • 1-ohm stable (no power ratings available)
  • CEA-2006 compliant
  • variable low-pass filter (50-200 Hz at 24 dB per octave)
  • bass boost (0-18 dB at 40 Hz )
  • subsonic filter (15/25 Hz, 18 dB/octave )
  • top-mounted controls
  • Class D design
  • speaker- and preamp-level inputs
  • preamp outputs
  • fuse rating: 30A x 2
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 14-7/8"W x 2-9/16"H x 11-1/2"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

What's in the Box:

  • Mono amplifier with two 30-amp fuses inserted into the chassis
  • Speaker-level input harness
  • Allen wrench
  • 4 Self-tapping screws
  • 2 Rubber terminal covers
  • Instruction Manual (English/French/Spanish)
  • Warranty Card

the amp is doing its job had it for 2 weeks and it really hits hard ,im running it 2 two earthquake 12s it stays pretty cool.nice bass

dominick, central coast


Kenwood KAC-9103D Reviews

Average Customer Review(s):

(10 Reviews)


stationdoor1 from Brownsville, Texas on 11/3/2008

Crutchfield Customer Review (What's this?)

I bought this amp from Crutchfield (refurbished). There were other websites were I could've bought it slightly cheaper, but I've been buying from Crutchfield for over ten years and their customer service is second to none. Plus, they have a 30-day money-back guarantee. The amp is wired in parallel @ 1 ohm to 2 Kicker Comp VR 07CVR124 12" Dual 4- Ohm Voice Coil Subs, total of 800 watts RMS. The amp's gain is set @ a ¼ of its sensitivity. When I turn it up, the lights dim with every bass note. The bass is ridiculous. The amp's output is >900RMS at 1 ohm. Since my subs are just rated at 800 RMS, they are pushed to their limit by the amp. The built in fan helps to cool it down and I haven't had any problems with the amp. The amp only had a small scratch, but nothing more than that. I highly recommend this amplifier, it's a great value. With the discounted price for the refurbished unit, you just won't get a better bargain anywhere else.




dominick from central coast on 10/30/2008

Crutchfield Customer Review (What's this?)

the amp is doing its job had it for 2 weeks and it really hits hard ,im running it 2 two earthquake 12s it stays pretty cool.nice bass



lots of solid, clean power.

septone from seattle, wa on 10/7/2008

I bought this amp, and a JL-Audio Box with 3 12s in it (CS312RG-W1v2), and hooked it up to a monster battery and 2 farad cap, and the bass is ridiculous. I had a pair of 12s @ 350w rms in my old car, and this amp and box blows that away (twice, maybe three times as loud as my only other really good frame of reference). I don't have any numbers on SPL or even amp draw, but I can tell you that it pounds way more than I need it to, and I never imagined myself saying something like that. I have a Kenwood KAC-8404 powering all of my door and dash speakers, some polk audio 4x6 in the dash, 6x9 in the rear deck, and infiniti 51/4" in the front door. I can turn it up to the point where it actually begins to hurt the ears without any distortion. Things may vibrate a bit, but most of the car is dynamatted up, so it still sounds clean. I am very happy with this amp, and the system it's in.



Great Amp!!

quang from Snellville, GA on 8/14/2008

Crutchfield Customer Review (What's this?)

This amp is great!! I have it hook up to two CVR and it hits hard! With 900 rms for this price, it's not a bad choice to buy it. All in all I love this amp. Also the shipping was fast. I ordered on Monday at 11 pm and I got it on Thursday at 11 am. Would recommend this amp to all those who wants a lot power.



Kenwood KAC-9103D

dan from New Mexico on 10/7/2007

I bought two KFC-XW1202DVC subs, and also choose "scratch and dent" for another 15$ off each. First off the scratch and dents were flawless, only scratch or dent i could find was on the factory boxes they came in, one was still in original factory packaging the other had been previously opened, but not a mark or blemish on it. As for sound, im no expert and i'm sure theres better out there but, these things blow away my 12" sony exploads, I also bought this Kenwood KAC-9103D amp to drive these subs, again i choose "scratch and dent" the amp had one little (1/2 in long) scratch in the top, but i can live with that, with this amp, theses 2 subs make my teeth rattle! No dissapointments here. Great Amp, Great Subs "Crutchfield ROCKS" you might save a few bucks somewhere else (total up all costs and you probably wont find cheaper) but for customer service you cant beat Crutchfield



Nothing Like It

SuperfastLarry from Oklahoma on 9/24/2007

Crutchfield Customer Review (What's this?)

i have had this amp for three mouths now or maybe four? what everyone is saying about this amp is true you soulden't of traded it you sould of just found a good one. im not the best at installing this Baby but i did it, You don't need a base Knob is got a base boost on it, The blue light isen't even that bright but the only problem i have with the amp is that i Got Two KFC 3011 <BR>Real sharp looking speakers but the longest time i had them with the same amp one or the other keeps blowing



Kenwood KAC-9103D

c~blaze from rock island tn on 8/6/2007

i got one of these brand new,its the biggest amp kenwood played good for like a 2 days.then i unhooked it to hide the wires.then when i hooked it back up,it wouldnt even power on.i took it back waited a week got another one and nothing it wouldnt power i switched it for a 500 rms mono amp and payed the difference.and sounded way way better,thumped way better,the kenwood cut off right before its rms.i have had the one i got now up at like 800 watts.and didnt cut off.also i dont believe it really pushes 1800 amp i got now is a 1000 watts max and it pulls the same amount of amp from the battery



Plenty of Power

Jonathan from Tampa, FL on 8/2/2007

Crutchfield Customer Review (What's this?)

I bought this amp because i didn't want my subwoofer (one 10&quot; 4-ohm Kenwood) to be underpowered....well it's definately not underpowered. I also love it because if I wanted to add another sub, I could drop in another and at 2 ohms and pull 900W out of it. It's durable, high quality, and performs GREAT. This amp is strong.




Joel from Elmendorf AFB on 5/25/2007

What more can say??? I have this amp hooked up to 2 12&quot; Alpine Type R's and when I finally hooked it up, I was speechless. This amp to me will get you the best bang for your buck. Don't believe me, try it yourself and you'll see exactly what I mean. Ecxcellent product.



WELLLLL worth the $$$$$

Marcus from Kansas city, MO on 4/29/2007

I set out to get a couple 12's and a good amp and this is the amp that was recommended for my price range. Got the amp and a couple Alpine SWR 1222D's, Built a Slot ported box for them and It was and has been incredible since I installed it a few weeks ago. I was most impressed at the fact that the amp barely got warm when i ran it hard. This amp is too much power for just my 2 subs so I went ahead and got a 3rd one. I found the perfect setup. The 3 subs are wired down to a 1.33 Ohm load and the amp is 1ohm stable so I have had NO problems with overheating and the best part is @ 1.33 Ohms I'm pulling atleast 1000w RMS!! Vol @ 80%, Bass @ 0 or all the way down, Gain at 1.2v. Bass slappin hard enough to shake everything in the car even your heart. Take a 15 minute drive like that, feel the amp and from 0 - 3 the temp of the amp is a 1. Turn the bass up a few notches and the amp will warm up to a 2. I ran it with the bass up a lil for about a half hour and I'd say it heated up to a 3 but no problems. It'd take a lot of abuse to get this amp HOT. There is NO Bass remote so U have to use the cd player to bass out. I hope this helps




Hands-on research

Product Research

Inputs and Outputs


CEA-2006 Compliant: CEA-2006 is a new system of testing & measurement methods for mobile audio amplifiers. This voluntary standard advocates a uniform method for determining an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts and the RMS power output is measured into a 4-ohm load, with 1% or less Total Harmonic Distortion (THD) plus noise, and at a frequency range of 20 Hz to 200 Hz when applicable. Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4 ohms. CEA-2006 allows consumers to compare car amplifiers and receivers on an equal basis. The Kenwood KAC-9103D under CEA-2006 regulations is rated at 500 Watts RMS x 1 channel with a 94dBA signal to noise ratio.

Mono-Power Amp Design: The Kenwood KAC-9103D is designed with specific features to power your subwoofers with a frequency range between 5-200 Hz. This amplifier is not designed to power a full-range speaker.

1-Ohm Stable: The Kenwood mono-amplifier is capable of handling load impedances down to 1-ohm. The amplifier is rated at 900 Watts RMS x 1 channel in 2 ohms at 100Hz with 1.1% THD. The amp is rated at over 900 Watts RMS x 1 channel in a 1ohm load.

Class D Amplifier Design: The KAC-9103D is a Class D mono-block amplifier, which uses digital switching to amplify audio signals. This design results in high efficiency and less heat.

MOS-FET Switching Power Supply: The amplifier utilizes a MOS-FET switching power supply providing thermal stability and efficient switching speeds guaranteeing performance and dependability.

Parallel Connection: The amplifier is equipped with two pairs of gold-plated speaker terminals for an easy parallel subwoofer connection.

Dressing Cover: The Kenwood KAC-9103D features a top cover that conceals all of its controls. This provides a very clean look as well as protects the amplifier's controls from being accidentally changed. The cover is held in place by two hex head screws. An allen-wrench is supplied to remove the cover.

Low-Pass Filter: The KAC-9103D has a built-in 24dB/octave low-pass filter that is continuously variable from 50Hz to 200Hz.

Bass Boost: The bass boost is adjustable from 0-18dB at 40Hz.

Infrasonic Filter: This amp features an 18dB/octave Infrasonic Filter. Ultra-low frequencies that cannot be reproduced by a subwoofer do not become sound but become unnecessary oscillations, which affect sound by causing distortion. These frequencies also waste amplifier power and can cause damage to speakers. Setting the Infrasonic filter switch to 15Hz or 25Hz cuts the frequencies below the respective frequency to improve the reproduction performance of the speakers by eliminating harmful distortion.

Phase Inverter: The amp has a switch that allows you to invert the phase of the speaker output. You can select 0° or 180°.

Line Level Inputs: The RCA type line-level inputs have a gain (Input Sensitivity) control. The Input Sensitivity control will accept an input signal of 200mV to 5.0 Volts.

Speaker Level Input: The KAC-9103D comes with a speaker level input harness. This feature makes it easier to add an amplifier to a factory radio or to a receiver with no preamp outputs.

Line Level Output: The amplifier has a set of line level outputs for feeding a full-range stereo signal to another amplifier. It is the same signal that is input through the line inputs. The amplifier's crossovers have no effect on the line level output signal.

Fan: There is a fan on top of the amp to help dissipate heat and ensure cool, reliable operation. There is a blue-LED that illuminates next to the fan when power is supplied to the amp.

Power Indicator: When the power is turned on to the amplifier, the Power indicator will light up. This indicator will turn off with the amplifier and will turn off if the amplifier goes into protect mode.

Protection circuitry: The amplifier features protection circuits that will turn the amp off in case of the following events to protect the amplifier and your speakers:

  • Speaker output contacts ground
  • Speaker wire short-circuits
  • Unit malfunctions and DC is sent to speaker output
  • Internal temperature is too high
  • Loss of ground of head unit or amp


Top of the Amplifier: All of the amplifier's controls are found on top of the amp under the removable dressing cover.

  • Bass Boost Level: 0-18 dB
  • Low Pass Frequency: 50-200 Hz
  • Input Sensitivity: 200mV-5V
  • ISF Switch: 25Hz, 15Hz or off
  • Phase Switch: 0 or 180-degrees

Inputs and Outputs

Front of the Amplifier: All of the amplifier's connections are found on the front of the amp.

  • Fuses: Two 30A fuses
  • Power: Gold-plated screw terminal (0.5625" wide)
  • Ground: Gold-plated screw terminal (0.5625" wide)
  • Remote Turn-on: Gold-plated screw terminal (0.3125" wide)
  • Speaker Outputs: Two pair of gold-plated screw terminals (0.3125" wide)
  • Ground Screw: Phillips-head screw for RCA signal ground if needed
  • Line In: One pair of gold-plated RCA inputs
  • Line Out: One pair gold-plated RCA outputs
  • Speaker-level Input: Multi-pin input for use with included speaker level input harness

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 verify what’s in the box, 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.