Annoying amp whine!

[Rc 415 10+ year member]

The amp is a US Amps MD2

Ok, I did a little bit more research in my car and here is what I have found out:

1) Its not the RCA's, How do I know? because I unplugged them from the amp and head unit and the whine was still there.

2) Its not the alt, How do I know? because the amp whines even when the motor is not running.

I have tried grounding the amp 3 diffrent places in my truck all to bare metal, to no avail.

Also, some of the radio AM stations are messed up and have a strange noise coming from them when the amp is connected.

I am using 1/0 Ground and 1/0 power cable. My radio is grounded at the stock location wherever that is, the place that installed it just connected it to the original harness with a harness adapter.

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[Rc 415 10+ year member]

^^

 

[NMBR1SPT 10+ year member]

is it the fan inside ? My buddy had an amp that the fan was bad in and it had an annoying whine........?

 

[Rc 415 10+ year member]

Md2 has no fan inside...

 

[squeak9798 5,000+ posts]

Sounds like the amplifier is malfunctioning.

Get a set of muting/shorting plugs to place on the inputs of the amplifier. If the amp still whines, then it's definitely internally within the amplifier.

 

[Rc 415 10+ year member]

Can I just use a 1' single rca and plug it into each rca plug?

like this only shorter:

 

[DC8 Flyer 10+ year member]

I had a similiar problem. The front and sub amp had no whine, but the rear speakers had a faint whine that was present any time the car was running and the the hu was on. I tried everything and even swapped amps around. I put the front amp on the rear speakers and the rear amp on the fronts, whine was now on the front. All amps grounded to a distro block and all RCAs were the same and took the same route through the care, so did the speaker wires. Talking with a few guys around town, it sounded like there was something internal with the amp, since the whine was a constant volume (very low) and no other amp experienced it. Solution, took the amp out and now run fronts and rears off of one amp so no fading, but it is all good.

 

[squeak9798 5,000+ posts]

Make the muting plug yourself.

Take an old/cheap RCA and snip the wire about 3" from the RCA end. Strip back the insulation and find the wires that connect to the tip and the shield. Connect these two wires together, and it will present a "dead short" to the input of the amp.

If the noise persists, then the noise is inherent to the amplifier.

 

[Rc 415 10+ year member]

Since I already have the 1' single Rca I should just cut it to a shorter length?

 

[squeak9798 5,000+ posts]

If you don't mind destroying it you can use that to make the muting plugs.

 

[Rc 415 10+ year member]

Any reason they have to be as short as possible?

 

[Rc 415 10+ year member]

oh and i just noticed that if i wiggle the rca's the sub starts moving and making noise.

 

[Rc 415 10+ year member]

It stillwhines when i plug in the muting plugs //content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif

 

[iamamp3pimp 5,000+ posts]

Amp = Broke

 

[squeak9798 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/word.gif.64b12e39f936af3b4fff38a1c0bd0244.gif

Amp is in need of repair