Help with my friends system

[derek33 10+ year member]

My friend has my old system in his audi a6.

2 amps, 2 subs. 1 amp to each sub. pretty basic.

its been in there for 3 or 4 months, and everything has worked fine.

lately one of the subs pulsates for no reason. it sounds like a heart beat.

Its only one amp/sub that does it. and its the "2nd" amp, it is the one that is muching off the first amp. (rca from headunit goes to the first amp, then the rca goes from the first to the second)

any idea whats causing this?

thanks

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[bimma85 5,000+ posts]

sounds like a heart beat??? uh

 

[derek33 10+ year member]

no he did not bury a heart in the floorboards of his car.

 

[XtrmAudioCncpts 10+ year member]

are they 2 different make amps? or is it 2 different make subs? is the gain set the same on both amps if both of the amps are the same? there is a few things that i could be

 

[bimma85 5,000+ posts]

x2 on gain, have you measured output on amps recently? Made sure both subs are fine? Still not 100% sure about "heartbeat" noise. Is it like a ground noise?

 

[Rattlebrain 10+ year member]

The Tale Tale Sub??

 

[derek33 10+ year member]

im not fermiliar with ground noise.

it sounds like regular base, but its just irrelivent to the song.

all amps and subs are all the same model and make.

 

[derek33 10+ year member]

bump

 

[johnecon2001 5,000+ posts]

bad amp bad RCA's or a loose ground.