Problem with C1100.4 noise

[Iosias 10+ year member]

Well after finally getting a chance to install my new C1100.4 I had a terrible hiss with it that only got worse as the gain went up.

So far I have tried swapping everything around the amp to eliminate it them from the problem except new rcas and I haven't tried it in another vehicle.

New Rcas will be here today, shielded and all.

I have swapped HUs

I have Tried both sets of channels

Amp is ground directly to battery

Gain High or low high.

Tried a different amp and don't have that issue (I have low level noise but I believe its a source unit problem)

Amp does have the HPF on and set to 5khz, which is what I need to actively run my tweeters.

Other amp which I have no problem is a ID q450.4

Ill be trying it in a different vehicle today and new rcas after that.

Any advice on getting this narrowed down to the amp would be amazing.

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[dutchmaster 10+ year member]

try a different ground like straight to the frame, and make sure your rcas arent near your power wire. may be just your head unit i doubt the amps dead out the box

 

[Iosias 10+ year member]

try a different ground like straight to the frame, and make sure your rcas are not near your power wire. may be just your head unit i doubt the amps dead out the box

Rcas are opposite of power runs. I have battery in the back the amp is ground to. Ill try a frame ground though, but not sure how that would be better then directly to the battery.

I doubt it a bit as well which is why im going through the trouble to figure this all out lol.

 

[dutchmaster 10+ year member]

my brother blew the outputs on his m3a due to grounding to his batt from a ground loop. if your sub amp his outputs try running the amp that way, your front/rear output of your deck could be outta wack

 

[Iosias 10+ year member]

my brother blew the outputs on his m3a due to grounding to his batt from a ground loop. if your sub amp his outputs try running the amp that way, your front/rear output of your deck could be outta wack

Do you mean run rca from sub output rcas to the amp ? Thats worth a shot.

Only thing is the problem was present with a different HU as well.

 

[dutchmaster 10+ year member]

yeah if it sounds good just get a y splitter.

what kind of car do you have?

 

[Iosias 10+ year member]

2003 Silverado Ext Cab

 

[Iosias 10+ year member]

No other suggestions people?

 

[slim2fattycake 10+ year member]

is the rcas some cheap kind? i have the same problem in my friend's car. i will try to replace the rca because the rear channels in the amp are running to a sub and there's no noise in it. the only difference is the rcas. i'll also try a new amp ground as well as grounding rcas. my last resort somewhat cheaply is getting a ground loop isolator.

 

[Iosias 10+ year member]

Tried it with a completely different install and heavily shielded rcas, no change.