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Thread: amp/6x9s whining when revving???

  
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    amp/6x9s whining when revving???

    Hi, I just put my amp and 6x9s in, wired it all up, works fantastically......until I start the engine! The speakers whine with the engine revs, and theres a low pitch buz when I turn the heaters on.....any ideas anyone???

    Here is how its setup....

    Power lead - direct to the battery (fused at battery end)
    Earth lead - good earth (to the rear left light)
    Amp - usual, 2 speakers, rca's etc
    Head Unit - JVC with ipod adapter

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    Toms1989's Avatar
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    Did you scrape off the paint where your earth mounts too?

    Try re routing the earth to a more central point in the car, like a seat mount see if it makes the sound go away
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    sounds like you could have your phono cables wrapped or crossed over your power cable. or a poor earth.
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    If you check the earth and is still happens, check the phono leads too - I had one cheap one, one expensive one, and the cheap one was causing the whine. Once I replaced it with a fully shielded lead the whine went.

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    Hi, it took me a while as I decided to re-do all my wiring....nothing changed, I even went and bought a 'fusion' set of leads so as to eliminate cheap n nasty ones! My leads and remote lead now run down one side of the car, my power down the other, so there is no way they are near each other, I sanded the paint away to the bare metal and tried the seat mounts too, still no joy! Its getting really annoying now as Ive had to unplug my amp as the whining was causing the missus to whine even loader pmsl, any other ideas peeps? Thanks

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    Maybe need to fit a resistor to the head unit feed. We used to do that years ago but unusual to hear of that rev/whining problem nowadays

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    my mate had the same problem so i fitted some ground loop isolators to the phono's just before the amp & it cleared it all up.

    http://cgi.ebay.co.uk/GROUND-LOOP-IS...item3caa13c1c9

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    If youve checked 100% that all the earths and connections are good and that your wires are thick enough, and also that your RCAs arent running near power (though this shouldnt cause this anyway), try another head unit. sometimes the earth track can blow on a headunit causing the h/u to earth through your RCA leads which creates this alt whine youre getting. they are more common on pioneer but i had a clarion that done it, if you touch a +12v source to the outside part of the rca lead it can blow the earth track.

    If you try another headunit and it goes away, use bits of wire to earth the outside of the rca to the frame of the headunit, this should fix the problem.

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    I know its unusual, I havent had this problem since the 90's pmsl! I know the head units fine as it was all running perfect in my old car (a 21 year old escort!!!) I'll give the GROUND LOOP ISOLATOR a go as theyre cheap n cheerful, thanks guys, I'll let you know how I get on :-)

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    as above .....prob needs a supressor on the alternator like back in the day

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