Question about Dual 2-Channel Bridgeable MOSFET Amplifier (XPA4100) Car Audio Amplifier

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Dual head unit help!

I purchased a Dual head unit a year or so ago from BestBuy.
Around 3 months ago, my volume suddenly began acting up and when i turn the volume knob counterclockwise to lower the volume, it became louder and is not stuck on the max volume.
So now, i can't turn it on to listen to music or the radio since im afraid i will blow my speakers. Does anyone have an idea of what may have caused this problem? Any help is greatly appreciated. Thank You. (by the way, BestBuy wont do anything since i lost my receipt from a year ago, and apparently, they don't have any record whatsoever of my purchase on any of their computers??? B.S.)

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Re: Dual head unit help!

It sounds like the POT has gone bad, I assume it is a digital volume control right. if you turn it down slowly does the volume go down. if so its the POT

Posted on Jan 07, 2008

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Re: Dual head unit help!

You can try contacting the manufacturer to see if it can be repaired.

When you have this type of problem, it's generally due to the rotary encoder failing. It's unlikely anyone else will have parts.

Posted on Dec 22, 2007

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I have a Kenwood KAC-5204 amp on dual Kenwood W-110S subs, been working fine since I installed it all about a month ago, and I got in my car this morning and noticed no bass. I saw that my red power light...

Check the fuse in the amp. There should also be a fusable link that houses a huge fuse, if that blows it will give the same effect. You will want to check to make sure that the wire that runs from your battery to the amp is secure and free of corrosion as well. If all of the above is fine, then I would recommend that you check to see if the rca cables are plugged in securely in the head unit.

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Powers down at high volumes

If your head unit powers off at high output it could be several things.
1. check ALL your grounds (head unit, amp, etc..)
2. it could be a a short.
3. head unit could be defective

disconnect the amp power/signal and see what hapepens.
If it doesnt happen you probably have an open ground or short in your amp power or signal cables. Amp could be defective but that is unlikely

If it still dies when the amp is disconnected it is isolated to your head unit. Check your head unit's ground/power/fusing or swap in another head unit to eliminate wiring faults.

Good Luck!

May 01, 2009 | Car Amplifiers

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Visonik amp problem... amp goes in and out of protection

Check for intermittent shorts on the speaker leads.

Turn down the volume control on your head unit while operating the amp, you could be over driving the amp.

Remove Speaker leads and reset the amplifier. IF the protection LED still comes on amplifier is faulty.

Below is the link to put in a help request with the manufacture for repair.

Mar 25, 2009 | Visonik V408XT 250W x 2 Car Amp Car Audio...

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Amp shutting off

your amp is likely over heating.Does it have enough air space around it? You may be over driving it does your head unit have variable out put? if so try lowering the output volume to the amp
Hope this helps...........Good Luck!

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JVC dual bridgeble AMP

Have the speaker checked out and if it checks good you need to take the amp back to the repair center and have them test it better. Most repair centers have a 30 day warranty on the work they perform. Make sure they know what the problem is in detail, so they know how to check it properly. But my first thought is the speaker could be faulty. You can check the speaker yourself by switching them at the amplifier. If the same speaker sounds bad you know it is the speaker that is bad. If the sound is bad from the other speaker, then the amp is bad unless it is coming from the head unit. You can also switch the RCA input jacks after that and see if the problem changes speakers, if so, the RCA output of the head unit is bad, but that is less likely.

Jul 01, 2008 | JVC KS-AX4750 Car Audio Amplifier

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Ok this problem is killing me...

maybe the speaker is bad

First try one thing, switch the rca jacks around and see if the other speaker stops working this time.

If so the problem is in the rca jack or head unit.

If the same speaker is still not working, the problem will be the speaker, you will have no other options left since you changed amplifiers and checked all wiring.

Let me know if this helps you

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Amp works fine, no sound thorughout vehicle...

I can think of ten things, nine of them are a bad amp.
Check with your installer, Take your checkbook.
Sorry I can't be of more help.
Regards, Paul

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If the amp still goes into protect mode, the easiest thing to do is disconnect the RCA cables from the amp and see if still goes into protect mode (after turning off/on). If it does, the issue lies in the amp or the wiring to/from the amp (most likely case). Check to make sure no speaker wires came loose and touched +12V or ground (car body). From the sound of it, my guess is something internal to the amp died and will need repair.

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Blowing Fuses

If you disconnect the speaker wires from the amp and the fuse blows only after the remote voltage is applied (when the head unit is switched on), the output transistors are likely shorted.

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