i got an older mtx 1501d amp.. i have it to my rocford ten right now when the gain is low it plays but if i try to turn it up even with no music playing it makes a bunch of random bumps... also when i turn my truck on it kinda makes a squealing noise for a little bit?? whats going on is it just too much for the 10??

 

gain is not a volume knob!


either short in the inputs or you have a problem on the board.

 

Sounds like problems with the inputs or RCA cables to me...remove the RCA's and see if it still happens.
Is the squealing noise coming through the speakers, or out of the amp itself?

 

squeal is from the ampp also this amp doesent have fuses on the outside? i can try the rcs wires but i would like to use this amp for my L7 15 but i dont want it to be a hazard to my new sub...

 

one of the mosfets is bad - when mosfets partially fail from overheating or current overload, their current capacity is severely reduced. When you exceed that limit the mosfet no longer switches as it is designed and the result is popping, bumping, and a high or low pitched squeel.

 

oh man that doesnt sound good well it bought it for 15 bucks off a buddy im not really to worried about it i plan to get a hifonics or cadence amp for my L7 can the amp be fixed?? i could still get it fixed and sell it

 

+1^ Amp is probably not worth fixing. Most low to mid level amps aren't worth fixing anymore. That is why it is impossible to find companies that do it at all these days...

 

I've soldered new mosfets in from donor amps and it will work but it will never be as reliable as it was originally unless you use original parts. It is really fun though.

If you have a spare amp with similar rated mosfets, I would go for it. The only thing you really need to worry about is verifying that you swap NpN chips with other NpN chips and not PnP chips. Google is awesome for verifying that.

If you get them backwards you will get an awesome blue fire for about 10 seconds.

 

i have no clue how to do any of that im gunna mess with it tho another question are hifonics amps any good? i just bought that L7 im just tryin to get the best amp for a low price lookin at the hifonics titan series

 

If you are using a JL, but it sounds like you don't want to spend the money on a matching JL amp, use one from their TMA line. They produce a 1000.1 that I have personally heard mated with a W7 and it sounds stellar. Price is pretty cheap also.