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    Iosias's Avatar
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    Problem with C1100.4 noise

    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.



    Refs # Tallc, CleaRSkieS, Roth, Goindef154, Kangaroux, tv559




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    Re: Problem with C1100.4 noise

    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




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    Re: Problem with C1100.4 noise

    Quote Originally Posted by dutchmaster View Post
    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.



    Refs # Tallc, CleaRSkieS, Roth, Goindef154, Kangaroux, tv559

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    Re: Problem with C1100.4 noise

    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




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    Re: Problem with C1100.4 noise

    Quote Originally Posted by dutchmaster View Post
    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.



    Refs # Tallc, CleaRSkieS, Roth, Goindef154, Kangaroux, tv559

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    Re: Problem with C1100.4 noise

    yeah if it sounds good just get a y splitter.

    what kind of car do you have?




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    Re: Problem with C1100.4 noise

    2003 Silverado Ext Cab



    Refs # Tallc, CleaRSkieS, Roth, Goindef154, Kangaroux, tv559

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    Re: Problem with C1100.4 noise

    No other suggestions people?



    Refs # Tallc, CleaRSkieS, Roth, Goindef154, Kangaroux, tv559

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    Re: Problem with C1100.4 noise

    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.



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    Re: Problem with C1100.4 noise

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



    Refs # Tallc, CleaRSkieS, Roth, Goindef154, Kangaroux, tv559

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