Question about Kenwood KAC-8103D Car Audio Amplifier

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Protection Circuit When I crank low bass with this amp it cuts off for about 15 to 20 seconds then cuts back on. The amp sounds great with the 2 12" cadence mallets untill the amp cuts off. My ground wire is connected to a part of the car that still has paint on it , should a sand the paint off? I dont know how many ohms the speakers are so they might need to be rewired.

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Re: Protection Circuit

Yes, always a good idea to use a wire wheel and drill to get a super clean place for your ground. That was going to be the first thing I suggest. I would use a meter and see how many ohms the subs are at right now. It may be two low and there is too much current demanded form the amp at once. for a good sub wiring guide, go to
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Posted on Jan 24, 2008

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I have a kicker zx350.4 for door speakers and the amp keeps cutting off once the bass hits hard or i have it aloud , once i put the volume down or bass low it comes back to normal and amp doesnt get hot at...

kappas are 2ohm. You are running that amp at 2ohms stereo on front and rear channels. That is a nice amp, but it is a thirsty one. If you have a sub amp as well, then you are not supplying your amps with enough power. drop down to 0 gauge and see if it heats up anymore. Also, try going high pass if you have subs. If you don't have subs. You need to run 4 gauge and make sure you have a great ground.

Oct 31, 2014 | Car Amplifiers

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Is this a good amp

I classify this as a sleeper of the car audio industry. it is powerful, well built, cheap, feature laden, sounds great! very comparible to the big names such as kicker, alpine, fosgate an all the rest. i would prefer this amp over any of them any day of the week! here are the specs for it incase u didn't have them.
  • Max. Power Output: 800W x2Ch.= 1600W @2 Ohms
  • Power Output:
    • 330W x 2Ch.(@2 Ohms) Less Than 0.5% THD
    • 220W x 2Ch.(@4 Ohms) Less Than 0.3%THD
    • Bridge: 660W x 1 Ch.(@4 Ohms) Less Than 0.5% THD
  • All Measurements Done @ 14.4V DC, 1 KHz Input Signal.
  • Dual VU-Meter
  • Dual Fan Cooling System.
  • LPF (Low Pass Filter) Variable 30Hz-250Hz
  • HPF(High Pass Filter) Variable 50Hz-l KHz.
  • Slope Adjustable 12-24dB.
  • Variable Bass Frequency(30Hz-120Hz).
  • Variable 0-18db Bass Boost.
  • High & Low Adjustable Level Input.
  • Dual LED Indicated Power Status (Protect/Power).
  • Mosfet DC-DC Switching Power Supply.
  • Built-in Protection Against Short Circuit, High Temperature & Overload.
  • Auto Power On/Oft By Remote (+12V).
  • Dimensions(mm) : 300(W) x 57(H) x 697(L)

Apr 04, 2010 | Rockwood 4224RTX Car Audio Amplifier

1 Answer

My infinity reference 7540a amp cuts in and out with heavy bass when the ''loud'' feature is on. I redid my ground, remote wire, shortened my power cable, and double checked all speaker connections. I dont...

sounds like ur gains are set to high and is going into protect mode

also what ive seen happen before is the speakers (if mounted in metal shelf or door and arnt bolted down correctly can flex under bass notes and flex the speaker that much the termanls short onto the metal and amp hits protect mode
(rare but worth a look if you think u have elimanted most other things Had a dude come to me when i was working in sydney with this problem )

also could be things like clipping protection , overheat protection ,amp drawing to much current from the alternator

do your lights dim when you hit the bass notes ?

get back to me and im sure we could solve this problem

Jan 22, 2010 | Infinity Reference 7541a Car Audio...

1 Answer

I have an Alpine M500 mono amp that works great, until you turn up the volume. I can adjust the bass down at the head unit, but at higher bass the amp shuts off. And then comes back on after a couple...

I don't think either, I believe your running theamp load too low with too low an ohm speakers and this cases the amp to produce more power but not stable and it overheats and the thermal protection cuts the amp off when the temp gets too hot to prevent damage.. Make sure your speakers depending on how they are wired do not exceed the amps load rating

Oct 26, 2009 | Alpine MRD-M500 Car Audio Amplifier

2 Answers

JL 300/2 v2 Power Light Blinks, No sound out of Sub. Works in friends Car HELP

Are you sure you don't have any shorted wiring or defective speakers?

Sep 30, 2008 | Jl Audio 300/2 Car Audio Amplifier

1 Answer

Amp clickin in and out

Had a similar problem, mine was a power problem.
Power meaning voltage.
Those big bass speakers draw lots of power. My original alternator couldn't keep up.

Question: Do your headlights dim in rhythm to the bass hits?

If so, your sound system wants more power than your vehicle is producing.

My first solution was a high output alternator. It worked great.

Then I added another amp. Not great anymore.

My second solution was to tie in a large capacitor to the amps power supply. (These a big (1 farad), about the size of a Pringles can)

Your amps power consumption is not uniform. Each time your amp punches the bass, it draws extra power. If that power isn't available, it starves and shuts down (if only for a second) then restarts.

The higher the gain, especially using a low pass filter, the more power needed for each thump. Thats why when you turn the bass down, you can get higher volume from the rest of the system.

How a capacitor can help (simply put):
In this application, the capacitor acts like an auxiliary battery, smoothing out power fluxuations. The capacitor builds up its charge literally between bass hits when power demand is low. Then releases it's charge when the demand is high. Think of it as an on-demand power boost.

Hope this helped


Jul 10, 2008 | Rockford Fosgate P3001 Car Audio Amplifier

1 Answer

Amp goes into protection

First change the wire,and disconnect the subwoofers to check if the amplifier turn on without going in to protection mode,if the amplifier go to protection mode you gotta change the Audio amplifiers IC's because they are in short circuit.And if don't go in to protection put one speaker at a time to check if one of them are damaged.Good luck.

Jun 02, 2008 | Kenwood KAC-9102D Car Audio Amplifier

1 Answer

Amp cuts out when turned up

that amp cutting out like that means that its probably shot and it time to start looking for a new one

Apr 09, 2008 | Directed D800 Car Audio Amplifier

1 Answer

Peavey Bass amp 115

HI Subicbay,

ADjust your Gain setting to limit just enough so the amp does not go into Protect mode. Turn your Gain all the way down, then crank up the bass from your system. GRadually turn up the gain until you trip on protect. Turn the gain back a notch and your set for no more protect.

Oct 27, 2007 | Jensen XA4150 Car Audio Amplifier

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