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    MeAtWork's Avatar
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    Icon32 Subwoofer problem

    I have a subwoofer problem:

    Problem is that the subwoofer keeps bouncing back and forward even if there is no bass, this creates a chopper like sound and is really irritating and I think not good for the sub as well. Also if the bass comes the sub will go on with the bouncing and will try to create the bass as well which results in a missformed bassdrum.
    The sub is connected to a 2-channel amp in bridged mode. If I disconnect one of the rca plugs it will give a couple good bassdrums (less power off course) and then jump to safety mode and jumps back a couple of secs later and so on. So that doesn't help either.
    The sub is a RF DVC 2x4Ohm but connected the way I have 1x2Ohm.
    I made a drawing with the sub and amp settings.

    ANYONE KNWOS WHAT THE PROBLEM IS AND HOW TO FIX IT???
    Attached Thumbnails Attached Thumbnails Subwoofer problem-schema.jpg  



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    I could be wrong, but it sounds like the sub is out of phase, which is caused by it being wired incorrectly to the amp. Check all the wiring before you do anything obviously. I think that a sub being out of phase is specifically caused by the wires being switched at one end, but correct on the other. Example: SVC sub, -sub to +amp and +sub to -amp.

    Sorry for the horrible wording.... sleep deprivation

    If the amp allows for bridging at 2ohms mono, try running a wire from the + on each VC to the + on the amp, and a wire from the - on each VC to the - on the amp. This should make the amp see a 2 ohm load, and most likely produce the highest wattage allowable. This might be the equivalent of how it's wired now, but i'm not sure.
    Yet again... too many stimulants and not enough sleep.



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    MeAtWork's Avatar
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    The way the wires are connected is taken from the instruction manual so I guess this is wright.
    I noticed that if I put the variable switch into fixed (stable was wrong in the drawing) the problem is gone. Also if I put it in variable but turn the gain down the problem is also gone, if I then turn the gain up it starts bouncing again.
    Could this be that the sub or amp can't handle the power given or asked or that the amp isn't stable at 2 Ohms??



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    If the amp wasn't stable at two-ohms, the protection circuit would activate, and (probably) it would shut off and/or the "protection" light would come on. Either that, or it would just fry. How new is your head unit in comparison to your amp? From the picture, it looks like it may be one of the older amps that was only designed for up to 2 volts coming from the preout, as opposed to most of nowadays amps that handle much more.

    If this is the situation, then I would say that it's most definitely causing the problem, but I had no clue that excess voltage from the preout would make an amp do that to subs.

    I say that if it works with the switch at stable, then by all means leave it there and enjoy



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    Refs - M@nJo, Mebcop, IonSQL, NJTStang11, XXXBassHead, Havieri23, SQStephen

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    If I remember correct the amp is from '94 and the headunit from 2 years ago.
    So you say the headunit gives 4v thru the preout and the amp can handle only 2v.
    So I have to put it on fixed or look if at some point with variable it works correct and then comparise the sound level.

    Thanx on the comment and I will ask some store specialist about it to see if he got something to fix the problem..



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    No problem man. You could always just buy another amp....



    2002 Mercedes-Benz C32 AMG - Stock Bose stereo ... but 13.2 in the 1/4 mile!

    RIP Darkie : 96' Bonneville SSEi
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    PPI A404.2 Art Series -> Focal PolyKevlar 136K's Front
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    Refs - M@nJo, Mebcop, IonSQL, NJTStang11, XXXBassHead, Havieri23, SQStephen

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    whoa, hold the horses here, dont do anything crazy, just turn the little switch where it says "l+R, ST, Mono" to mono, and voila there you go.



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