Amp Help!!!

[OC33 10+ year member]

Ok her is the deal I was all excited today cuz the ups man came with my other Alpine MRD-M605 today. But when I hooked it all up it makes a big thud sound and I don’t now what is wrong help me out. The thing is that if I use the main rca cable there is no problem it is just went I try to connect the two one makes a loud thud noise what is wrong.

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[iceteebone 5,000+ posts]

are you connecting these with the amp on? what do you mean by main and two one?

 

[OC33 10+ year member]

are you connecting these with the amp on? what do you mean by main and two one?

no, the main rca the one connected to the HU

 

[OC33 10+ year member]

could it be cuz my rca from amp to amp is to long can that be it

 

[Little B 10+ year member]

It could be a bad ground on the second amp. It might be bad rca's. Try switching the wiring on the 2 amps around and see if it still happens.

 

[AcidicDreams 10+ year member]

double check grounds... make sure you are grounding to solid metal with a clean contact surface...

 

[OC33 10+ year member]

Well I found a old rca that was maybe 3 feet long compared to the other one that was 17 to 18 feet long I heard a little hissing but I guess I will just have to get a better one and it wont do that any more.

 

[OC33 10+ year member]

any cheap but good rca's out there

 

[OC33 10+ year member]

and it is not my ground cuz when i connect the rca that comes from the HU to each amp they really good