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

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Amp I have installed a amp into a figerglass boat, the radio is new and is working. However after connecting the amp I have no sound. I feel that I have a bad ground, would this be the problem. And shall I connect the ground to the motor.... Help

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Re: Amp

Make sure the amplifier is turning on. Remember ther is three wires that power the amp Battery constant, Ground which in a fiberglass boat run ground to battery not motor, Plus make sure the remote wire is hooked to power, generally it is switched power. But if the amp is not turning on temporarily hook remote and power together to battery and see if the amplifier turs on. Second be sure you have a good set of RCA cables hooking the radio to the amp. And finally check and make sure the gain is turned up on the amplifier.

Posted on Sep 01, 2006

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Hi. First find a place to mount your amp. You must run a cable for the of the battery directly to your amp and place a fuse in line, by the battry. The ground cable must be as short as possible. Then run your rca cables from your radio to the amp and a single cable to use as the remote cable. Now connect your speakers. Make sure go's to from amp to speakers. Depending on your radio, but most of them have a blue wire in the radio harnes, it is the remote wire. Now connect to the remote wire you ran and to the amp. Plug in your rca cables and you are ready to play. Any problems you can email me on

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Bought a hitron 3200b secondhand. installed the amp and no sound I have a 06 gmc I am using an aftermarket radio it is a lo line model made by I think dual 50 bucks at walmart all connections are good...

Bypass the amp with a small speaker or tweeter to make sure your rca input is working. Is the amp light on. Got good power, ground, and remote? Have you tried a different set of speakers on your amp?

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assuming your amp is working fine, locate and use another radio pre out put rca and plug it into the amp and see if that will work. you going to have to eliminate what bad, the radio or the amp. If still no sound than the amp is faulty. you can use home reciever to test it also using pre amp out put plug to the clarion amp. hope that make sense

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1 Answer

1996 mustang v6. the radio worked fine earlier

Stock headunnits are picky about the power they get, and when you are taking it to the headunit, it is putting unwanted strain on it. I can help more if I know where you put the fuse too.

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Amplifier and sub installation in a boat.

norally grounding them in the same place is ok but it could just theres not enough power from the amp too power two subs try hooking up one and see if that gives you the sound your looking for

Jul 09, 2009 | Car Amplifiers

1 Answer

My cd changer, radio and amp are inter connected.the owners manuel say that if all are not hooked up system will not work. i install an after market radio but cant get the factory amp to come on

Hello moemoneymood,

Since you did not specify the make and model of your aftermarket radio, I cannot pinpoint specific connection problems. Most aftermarket receivers have a "remote turn-on" lead, probably blue, but sometimes blue/white, usually terminated with a spade lug. In addition to power and ground, the amp requires this lead to be connected in order to properly operate.

Start by checking the wiring from the old receiver wiring harness and see which wires and what colors went to the stock amp. Then connect the corresponding wires from your new receiver to the amp. Some OEM receiver/amp systems had power and ground taken from the same harness, so you may need to run those separately.

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1 Answer

Amp is on, Subwoofer works, but no sound.

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