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    jcraft's Avatar
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    new amp installed - whine help!

    Hi all,

    Need some troubleshooting assistance here. I have a Sony HU installed for a couple years now. From the HU I am using RCA outputs running a non-shielded rca cable back to a JVC amp. this amp feeds a 12" sub in the trunk. four speakers are then fed from the HU. Now I purchased another amp (50x4) to run the 4 speakers. I put the 4 channel amp in the trunk also. I ran a separate # 8 wire to the new amp and also another # 8 wire and grounded to the same point as the sub amp. I then ran two 4 cond. # 14 cables ( on the other side of vehicle not near the power wires) from the new amp in the trunk back up to the dash and tied all the speaker wires in there. Now to test I used the rca cable that fed the sub amp ( pulled it from the amp) and used it to feed into the new amp. Now, when vehicle is not running and I turn HU/amp on, there is a very slight whine but as soon as you turn the music up even a bit you don't hear it. However, as soon as you start the car, there is a god awful whine coming from all the speakers. As you accelerate it increases and decreases with speed. Funny thing is I never got any whine from the sub/amp I had. I tried running a separate ground from the HU ( i only had a piece of 22ga. wire and ran it back and grounded it to the same point as the other amps). This kind of deadened it a bit but not much. Any other ideas on how to solve/troubleshoot. Hoping it is not the new amp. I also tried disconnecting each rca wire individually to see if anything changed but it didn't. Any other thoughts on what to try. Maybe I should use the RCA for the sub amp and run the new amp with the high level inputs. At present the HU only has one set of rear out/sub out outputs so I will need to put a bunch of Y connectors in to split to go to both channels of the new amp as well as one channel of the sub amp. Presently I have no Y's in the system though. Thanks for the help!!







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    maylar's Avatar
    maylar is offline Electrical Weenie



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    Re: new amp installed - whine help!

    Why on earth would you use non-shielded RCA cables?



    dave
    ----------
    1999 Buick Park Ave Ultra
    Head Unit: JVC KWHDR720
    EQ: Audiocontrol EQL
    Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
    Sub Stage: Boston G3 10", 0.5 cu ft sealed
    Amp: PPI Phantom 900.4
    Rear Fill: Boston SE953 6X9's

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    pickup1 is offline Audiosystem,Dynaudio...



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    Re: new amp installed - whine help!

    Better rcas or maybe even bigger wire..




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    Re: new amp installed - whine help!

    I guess I am not sure if they are shielded or not. I bought them at radio shack and the seem to be a good quality. they look to be a gauge or two larger than the cheapest. in any event they are running the other amp/sub with no whine.




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    maylar's Avatar
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    Re: new amp installed - whine help!

    Sub amp won't play the whine frequency.



    dave
    ----------
    1999 Buick Park Ave Ultra
    Head Unit: JVC KWHDR720
    EQ: Audiocontrol EQL
    Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
    Sub Stage: Boston G3 10", 0.5 cu ft sealed
    Amp: PPI Phantom 900.4
    Rear Fill: Boston SE953 6X9's

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    Re: new amp installed - whine help!

    Yes the sub amp will not play the whine frequency. I actually took the new one back and exchanged it for a new one of the same type. This one the whine was less pronounced but it was still there annoying as ever. THis is a cheap Boss amp I got from Advance auto. IT also sounded like crap when the car was off an I didn't have the whine ( hissing popping etc.) I transferd my front doors and deck speakers to the JVC I have running the sub and they sound great. I have ordered a Rockford Fosgate 300-4 which has great reviews and hopefully that will work nice and I'll return the peice of crap.




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    maylar's Avatar
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    Re: new amp installed - whine help!

    And get some good RCA cables. Something you can be sure of.



    dave
    ----------
    1999 Buick Park Ave Ultra
    Head Unit: JVC KWHDR720
    EQ: Audiocontrol EQL
    Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
    Sub Stage: Boston G3 10", 0.5 cu ft sealed
    Amp: PPI Phantom 900.4
    Rear Fill: Boston SE953 6X9's

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    Re: new amp installed - whine help!

    buying cheap components will lead to issues. Keep that in mind.



    2012 Volkswagen GTI 4dr
    * Factory RCD-510 H/U
    * MASSIVE AUDIO CK 6X 6.5 components
    * Alpine 3547 2-channel amp
    * Audison SR 1D monoblock amp
    * MASSIVE AUDIO TW10 10" sub in 1.36cu ft ported box (tuned @ 35Hz)
    * Streetwires OFC 4awg power/ground wires
    * Audio Control LC2i line output converter
    * Audio Control ACR-1 remote knob

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    Re: new amp installed - whine help!

    how long is your HU ground?



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