Annoying hiss = bad amp?

[hondarider 10+ year member]

I have had a small annoying hiss for atleast the last month in my system that i always thought was due to a ground loop. Today i did some more testing with it and after turning the amp on with a jumper from +12 to REM so only the amp was on i still got the hiss so i tried adjusting the ground and also a cheap noise suppressor with no success at all. I then unplugged the RCAs at the amp so there was no input signal and managed to still get the exact same hiss. Is there anyway to fix this or has the amp gone bad some how? I am stumped at this point since with my last HU was dead quiet with the same amp and grounding locations. I am not sure if it started immediately after switching HUs or not. Any thoughts or ideas would be greatly appreciated.

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[Enellz 10+ year member]

Its your deck, you need to ground your RCAs, Pioneer is notorious for having bad grounds. Check out the sticky in the electrical forums.

 

[michaellane 5,000+ posts]

can someone PM me details on how you go about grounding RCA's??????????/

 

[okiedokie 10+ year member]

I dont understand what you mean by having hissing from having a bad ground???

I dont think your amp is bad,what is the voltage on your deck???,2-4-5volts

where is the gains on the amp??

most amps have a voltage gains adjust,try to adjust the gains, by turning it down.

make sure you have a clean short ground.

 

[MakeshiftAudio 10+ year member]

I don't think it's a "bad ground" you're talking about, but rather it's designed to have a balanced output I thought? It's used to prevent a large amount of crosstalk noise.

Or it could be bad grounds, but it's commonly thought of as being the same thing.

 

[hondarider 10+ year member]

I don't think it can possibly be my deck because the sound will still happen with the deck off and RCAs disconnected at the amp. The pioneer deck claims 4 V. outputs. The gain on my sub amp is about 1/3 up but the gain on my frontstage is set pretty high i would say 2/3 to 3/4. I have tried turning the gain down which takes the hiss away immediatley but leaves me with very little volume, far from how loud they should get. Anyone know much about these Kicker SX amps i think the problem is either in the amp or maybe the ground

 

[gunz4me 10+ year member]

I've had old school amps that produced hissing while playing digital silence. They needed to have the audio filter capacitors replaced //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

I also had a Rockford Fosgate 4 channel that produced oscillation with nothing connected to it. RF ended up replacing the noise rejection circuitry on it.

 

[hondarider 10+ year member]

Is it possible that it could be the ground when the hiss occurs with only the one amp powered on?