Question about Kenwood Excelon KAC-X541 88W x 4 Car Amplifier Car Audio Amplifier

2 Answers

Amplifier stays in protect mode

Hello Ive got a little problem with my amplifier It was working fien but I think the plus cable touched the ground one and now the amplifier does not turn on unless I take the ground cable out of the amplifier the red protect light turns should go green.Could you tell me if the amplifier is dead or if there is a solution.Thank you.

Posted by on


2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

Hi I see your post was never answered and I doubt you still have this amp.. Many amplifiers are tossed in the trash due to this one little mistake! But for future use and I hope it helps: Install inline fuses on both polarities negative and positive, it is very important not to exceed twelve inches from your battery Reason: after this length resistance starts. to develop thus causing your amp to work harder and cause it to overheat and shut down and yes the red light will be on letting you know... Hey I'm a little warm after I cool off ill turn on again but I probably wont sound the same.... Thermal shutdowns,reverse polarity,low voltage,remote wire installed after ground wire all these mistakes cause the switching transistor to short out n throwing the amp in protect mode!! your local CB shop should be able to help you out next time I've been around amps since 16 yrs of age now I'm 37 and still trying to loose my hearing!! haha lol... hope this helps but remember always hook your positive cables remote, bat, mount amplifier, - batt , last the RCA cables...

Posted on Jun 02, 2012

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 9 Answers

If the positive power cable touched the ground, the fuse inline should have blown. Did it?

Posted on Jan 15, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a Dual CS714Q turntable with a constant hum on output. Any suggestions?

Did you connect single black ground wire to the "ground" terminal at your amp? Probably not! Or, it got stepped on it, while moving around. Professional of hi-fi turntables using magnetic cartridges and require 2 well shielded audio cables, connected directly to the cartridge, plus separate ground wire, which attached to all the metal parts of tone arm and body. Failure to connect this wire to the body(metal) or the amplifier, will cause this loud "hum".

Jan 11, 2012 | Audio Players & Recorders

1 Answer

Hi ive got like music playing through my 12 inch sub aswell as bass im pretty sure subs are just their for bass. ive changed RCA cables i dont know how many times new amp sub head unit and power n ground...

Hello..... I can help you with this problem. You need a crossover to remove all of the high and mid frequencies from the subwoofer. If you run the sub at "full range" (all frequencies), you will destroy the voice coil. If your amplifier has a crossover on it, put it in the "low pass" or "LP" setting. If your amplifier does not have a built in crossover, you will need to add one. A crossover can cost as little as $29 for an electronic one. This will fix your problem. If you have any other questions, just comment back and I will be glad to help you!

20 year car audio/video installer
Bay manager

Mar 27, 2011 | Car Audio & Video

1 Answer

Hum sound when plug in. if i touch the input jack the hum sound disapear.

The best way to test your sound problem is to buy another pair of patch cables/RCA cables and try those, most likely you have a ground loop in the RCA cables, basically you are creating a ground when you touch it.

Dec 04, 2009 | Fishman Audio Amp Temp - Green Amplifier...

1 Answer

Power light turns red

Make sure the red, yellow, and remote cable (usually blue and white stripes) that are coming from the radio are connected to the correct positions in the amp. Make sure amp is also grounded well enough that the ground cable does not come loose. make Sure none of the cables touch each other or the frame of the car (except for ground). Also make sure the cables for the speakers are connected to the amp and subs/speakers properly and not touch any part of the amp or other cables. Check the cables then write again if it happens again.

Sep 28, 2009 | Hifonics Brutus BXi 1206D Car Audio...

1 Answer

Live RCA cables????!!!!???

Ckech the ground, the only thing i can think is that the amp is trying to use them as a ground... but you probably have an extremely fried amp and guts are melted and making your RCAs make contact with the power wire, so i'd be real careful, and probably trash the amp. sorry about your luck dude...

Sep 23, 2009 | Pyle PLA2200 Car Audio Amplifier

2 Answers

Noise in my car amp.

sounds like you have a bad ground going to your rca's. try running a wire from ground to the shield of your rcas and see if the noise goes away.

Apr 19, 2009 | Rockford Fosgate Power 1050S Car Audio...

1 Answer


With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

Aug 19, 2008 | JBL GTO75.4 Car Audio Amplifier

2 Answers

Protect Mode with RCA's

It sounds like you have some DC voltage on the RCA input.

You need to figure out if the problem is coming from the head unit or if it is in the amplifier.

If you have a voltage meter, you can use it to find out very quickly.

Set the meter for DC and for a max level of more than 12 volts. Most meters I use have a 30 volt level. That would be a good setting.

Take the black lead and make sure it is grounded to the chassis of the car or to the ground of the power terminal, be careful and make sure it does not touch anything else.

With the RCA cable disconnected put the red lead on the inner part of the RCA cable and see if there is any DC voltage and then check the ground or outer part of the cable. Do the same for the other channel as well.

It should be very close to zero volts. A couple of millivolts is fine to. Any voltage here will cause the amplifier to go into protect mode, which is what is happening to you. You will then need to have the head unit serviced.

If you have a Pioneer head unit, I have seen many of them with an open ground fuse for the RCA jack. That fuse is a surface mounted fuse and is very small and hard to locate on the main board of the radio. If you do have a Pioneer head unit the voltage may seem OK, but you will have an open ground, but that normally does not put the amp into protect. It makes the audio sound very weak and you would have a loud hum. I can help you with that if it turns out to be the problem.

If the voltage on both the RCA leads is OK, then you need to check the amplifier.

You can put the meter lead on the ground of the RCA jack on the amplifier, if you have anything abnormal there, you have a problem in the amplifier. Be careful checking this because you can easily touch the lead to the chassis of the amplifier at the same time as the RCA ground. Most of the time, if yu have a problem in the amplifier like the one you are having, this check of the RCA ground will result in some DC voltage on it. If it still checks OK, then put the lead into the RCA ground and check the positive part of it. You may need to move the lead around a little to get it to touch the metal inside, it is on the bottom part of the hole inside the jack.

I think you will find that you have some voltage on the RCA inputs of the amplifier. To fix this properly you will need to take it in to be serviced.

Sometimes you can ground the RCA jack ground somehow with a jumper wire and then turn the system on with the RCA cable plugged in and it will seem normal. But you do not want to do that as a repair, only to see if the amp will play. If it does play, you know that the problem is in the pre-amp of the amplifier. That would be the only reason to connect an external ground to the RCA jack. You still have a problem in the amplifier. If it does not play normal, you still have a problem in the amplifier if there was some DC on the RCA jack.

Sorry this answer is so long, but the problem you are having will require service of one of your units, you just need to know which one it is. If your inputs get grounded, you will not have the amp go into protect, you just won't hear anything.

Let me know if you need more help and if this was helpful to you a good rating is always appreciated.

Jun 22, 2008 | Power Acoustik TS1440-2 Car Audio...

2 Answers

Blown part in amp

your protection is dead chenge releais and go

Jul 22, 2007 | MTX Thunder 81000D Car Audio Amplifier

1 Answer

Kicker zr360 amp

Double check that your ground wire is connected to the ground terminal, make sure the ground wire is not broken.

Oct 11, 2006 | Kicker ZR360 Car Audio Amplifier

Not finding what you are looking for?
Kenwood Excelon KAC-X541 88W x 4 Car Amplifier Car Audio Amplifier Logo

256 people viewed this question

Ask a Question

Usually answered in minutes!

Top Kenwood Car Audio & Video Experts

xxxxxx xxx

Level 3 Expert

4905 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers


Level 3 Expert

77932 Answers

Are you a Kenwood Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides