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Thread: interferance through amp

  1. #1
    Regular Member david-bell's Avatar
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    Unhappy interferance through amp

    hi every one just wondering if anybody can help i have an active sub woofer plus 6/9s running through a amp but ive started to get this interferance coming through both of them and its worse when the car is running when i rev the car it just a whining noice in tune to the engine its been fine up until his afternoon and dosent do it when they are disconnected ie head unit running through standerd speakers any help would be appreciated?

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    Default

    Have you kept rca leads away from power cables

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    Regular Member david-bell's Avatar
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    Smile

    hi no i havent should they be ? but its been fine up till today amp and subs been installed for a month they have been fine

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    Regular Member suj786's Avatar
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    I have rca cables running alongside power cable, has been like that for 2 years now, no probs. what kind of cables are you using, some cables aren't sheilded and thats where ur problem might be. most likely its picking up interference behind the dash and its being amplified by the time it gets to the amp and speakers.

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    Regular Member Cheeky_B's Avatar
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    You have a bad earth cable mate, have a look at that first!!!!

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    if it's a whining noise that you are having (and getting worse when you rev) then it is alternator whine... no question.
    Basically, you need to keep the power cable away from all other wiring (especially the speaker and RCA cables)
    Sometimes you can get away with it if the power cable is sheilded very well, but you should always keep them seperate anyways.
    Oh and to stop any background noise make sure you have a good earth (to bare metal) and use good quality wiring and connectors.
    Hope this helps.

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    Regular Member maz's Avatar
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    I had that problem before david-bell. May find that the amp circuit has gone, how old is the amp? I have never had or known anyone with problems of power cables running beside RCA but worth trying. As Cheeky B said check the earth and also check that all cables are conected correctly.

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    Default

    The whole thing with the power running beside speaker (RCA) cables, depends on what gauge wire your running.
    The bigger the wire, the more power it will draw and therefor more suseptable to sheilding problems.
    Think about it... when idling the car's alternator is at a steady pace therefor you get a small constant whine through the speakers. when you rev (and the alternator speeds up) it gets louder....the whine goes with the pattern of the revving.
    because the sheilding isn't good enough on the cables you have to move them apart.

  9. #9
    Regular Member david-bell's Avatar
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    Angry

    hi guys i checked all wiring earths etc . i have only had the head unit instaled for a couple of weeks and luckly i had sold my old sony head unit to my wifes brother so got him to bring it along this morning and i hooked it up as its the original set up when i had it in the vec the amp and sub work perfect so leads me to think my new head unit has a fault with its rca what pain in the ****? more hassle

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