Question about Kenwood KAC-9104D Car Audio Amplifier

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Knewood KAC-9104D AMP

I made the mistake of placing the ground and power wires on the wrong terminals. The fuses popped immediately. The amp appears to still get power but the sub will not work. I tried another sub I knew worked and still nothing. I can't find a local shop to repair it. Does anyone have any ideas on how I could repair this myself?

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  • Dalynn Turner May 11, 2010

    Do the subs pop if you take off the RCA's when the amp has power?

  • Perry Babin May 11, 2010

    The illumination will work even if the amp is badly damaged. It tells you very little about the condition of the amp. If you want to try to repair it, I'm willing to help. You'll need a multimeter and you'll need to measure the voltage at various points in the amp with power applied. Email me if you want the service manual.

  • AL Mack
    AL Mack May 11, 2010

    You may have blown the Input Stage on the amp. The fix requires soldering in a new input section that you can purchase from the manufacture of the amp. Did you open the case of the amp to see if it has a internal fuse for the circuit board. Does it smell burn at all? Use a Digital Multimeter and place on the +/- terminals for the output of the speaker terminals. If you have any reading on the outputs. (Use the volt settings on the meter) If no reading then it is the inputs Stage. If you use the Ohm's setting and the same terminals have no ohm's reading then the output stage is blown. Touch probes together to make sure the meter is reading correct or to zero it out. Try to find the service Manual for the amp to help you identify the internals.


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If your good with electrical soldering circuit boards you maybe able to pull it apart it may have just popped a capacitor  it should be obvious when u get it apart if it is   then you could go to radio shack or order off the net what cap  you need  remember to use low temp solder when soldering to the board  write down the numbers from the cap that is blown and order same to replace  hope this helps  

Posted on Feb 17, 2009

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How should i have my 4ohm single voice coil JL audio 12in subs connected to my kenwood kac-9104d 1800 watt max power (500x1 @4) amplifier?

On the outputs of the amp there is:

+ + - -
1 2 3 4

terminals. Internally in the amp the positives (1 and 2) are connected together and negatives (3 and 4) together. So there is no difference between hooking up in any of the configurations 13, 14, 23 or 2->4. If its a matter of style, probably use the 14 set, since they're furter apart and harder to short out that way, but electrically it doesn't matter.

Feb 21, 2011 | Kenwood KAC-9104D Car Audio Amplifier

1 Answer

I have a Kenwood KAC-9104D that will power on but not produce any sound??

Be sure the RCA cables are attached and in good condition.
Be sure the remote wire from the deck is hooked up and good.
Be sure the GAIN control is turned up.
Volume on head unit is up. Make sure BASS options are not turned off on deck.
Be sure wires are going the right way. + to + & - to -
Loose wires in the box. Make sure subs are hooked to the terminals inside box.
Check all fuses on amp to determine if 1 or more i blown.

Feb 18, 2011 | Kenwood KAC-9104D Car Audio Amplifier

1 Answer

My kenwood KAC-9104D only hits when i tap the side of it or tilt it at a weird angle.... what do i do?

i had the same problem with the same amp. it was the internal positive terminal on the amp. the connection was bad. i was an easy fix.

Dec 23, 2010 | Kenwood KAC-9104D Car Audio Amplifier

1 Answer

I have power , but the amp wont turn on

Where is your ground located?
It never hurts to put a beefy ground on an amp. If you do have it grounded take the bolt out use a wire brush on the bolt and on the surface you are grounding to. Also check our remote wire(blue). The purpose of this wire it shuts your amp down and turns it on when you turn on the head unit.

Apr 04, 2010 | Kenwood KAC-9104D Car Audio Amplifier

1 Answer

On my amp the blue light dims and makes my sub pop insted of pounding

You're amp is not getting the maximium power then it once was. You must tighten the ground or reground it scrapining the metal. There is a lot resistance somewhere in your system. recheck your power connections making sure they are tight and not corroded already especially near the battery. take out the old fuse and replace it with a new one and see if the amp improves its power.

Sometimes the fuse internally breaks loose and has a bad connection without looking bad. You can measure this with a multimeter. See what the voltage on the side of the fuse holder away from the battery is. Is it 12 volts or does the voltage drop drastically.

Sep 26, 2009 | Kenwood KAC-9104D Car Audio Amplifier

1 Answer

KAC-9104D output terminals

This feature allows the amp to be paired to any stereo. The input may be in stereo but the amp then changes it back into mono using sound from both sides. Hope this answers your question.

Jul 23, 2009 | Kenwood KAC-9104D Car Audio Amplifier

1 Answer

I just had this thing running maybe a month ago no problems nothing working great. now about a month later its turning on then going off i seriously am retarded when it comes to this **** i had it hooked...

Hello bloodyspokes, For the amp to go immediately into protection, something is probably shorted, grounding out, or not grounding properly. First, remove and check the 40A onboard fuse just left of the power/ground/remote terminals. If the fuse is OK, disconnect the speaker wires and try powering up. If it powers up OK, check the speakers and wiring. If it doesn't, disconnect the inputs and try again. Check the grounds of both the amp and your receiver. If these check OK and the amp is still not powering up properly, it's most likely an internal component failure and the amp needs service. Hope this helps.

Jun 03, 2009 | Kenwood KAC-7202 Car Audio Amplifier

2 Answers

KAC-9104D output terminals

ok i have the same amp and 1 2ohm dvc sub and was woundering the same thing but from futher research and askin sum xsperts. What i found out is that it is only one channel and even tho there are 2 (+) and 2(-) they actually connect inside the amp makein it one . so if u wanted to wire sumthing parralel u wouldnt have to hook wires from one coil to the other on the speaker , u can just hook it up to the amp. so basically both +'s and negatives on the amp are actually one within it so all the power if you only use one set of them and if u wanna add more subs its just easier to add to the amp by using the xtras .

Jan 13, 2009 | Kenwood KAC-9104D Car Audio Amplifier

1 Answer

Kenwood KAC-9104D

Circuit City ? I'll keep that opinion to myself.
If all is properly hooked up, Check the ground wire for the amp.
Give it a tug where it is connected to the car chassis, NOT the amp,
if it moves or comes loose thats easy to fix, scrape the paint off the grounding point use a high quality ring terminal and a oversize screw with a star locknut. Also check the wiring in the box.
Subs and boxes are quite heavy. And if it's banging around, I hope you have it in a trunk, they are very lethal projectiles in a hatchback should you have a accident.
My second thought is that you may have dislocated a component , solder joint, or cracked the PC board,
When in doubt see a installer. Good luck Sumthin

Jun 04, 2008 | Kenwood KAC-9102D Car Audio Amplifier

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