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| fourL6 |
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response 4 chnl amp running 2 type-R splits and 2 us audio subs
Hey All hav a reving noise though speakers (dont think its though the subs but could be due to the LPF) but only when the RCA's are pluged into the amp for the subs... hav ruled out a dodge RCA cable and earth problems any more ideas...?
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| Krytox |
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ran the RCA beside the Power wire?
_________________ Carefree, we may not be number one, but we're up there. |
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| fourL6 |
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they are fairly close but it only does it when there both plugged in.. if just the front peakrs r in there fine sam with subs and no front speakrs.. its only when all three or four rca's are plugged in...
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| fourL6 |
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hey all... ran the power cable down the other side of the car and its fine now.... sorry didn't realize how many threads there are about this...
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| twr7cx |
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the lazy alternative is to just get a Ground Loop isolator, it's a box that goes inlinee with the RCA leads, seems to stop it. but you end up turning up your gain as it lowers the volume a bit too.
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| fourL6 |
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yeah ended up with the lazy alt... it came back...
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| phongus |
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so it is still making high pitch revving noise? If it's still doing it, then it most likely would be the RCA cable near the power cable...If the RCA cables have to cross the power cable close to the amp, try to make them cross each other at a 90 degree angle, so in a x or + manner. Should lower the whirring noises during revs.
If that doesn't solve the problem, it could be the amp, something internally <--- just a wild guess. phong =P~
_________________ phongus = Post whore 2006 |
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| KILHSV |
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i had the same problem with mine i just ran the rca`s on passanger side and then ran the power on the drivers and it stoped my problem.
but yeh like the other guys said you can buy a box that reduces the noise, i think you get it from repco, my mate needed one for his car.
_________________ (KIL HSV) ITS ALIIIIIVVVEEEE ITS ALIIIIIVVVVVEEEE!!!!!!!!!!!!! |
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| smiley235 |
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get some bare cable and loosely twirl around the RCA's where it crosses or comes close to the power cables. and then earth that wire. Then wrap that portion in aluminium foil.
_________________ 178.3 rwkw
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| fourL6 |
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{USERNAME} wrote: get some bare cable and loosely twirl around the RCA's where it crosses or comes close to the power cables. and then earth that wire. Then wrap that portion in aluminium foil.
so is this whats happening in the box???
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| outlawxr6 |
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A ground loop isolator is simply a transformer that "isolates" one end of the cable from the other so there is no electrical connection through the cable which avoids ground currents flowing through the system.
Unfortunately being a transformer there are some losses involved though not a lot but there is the issue of loss of frequency response changes as transformers change efficiency as the frequency changes. So these should only be used as a last resort, like most things it is best to get everything right before using a band aid.....
_________________ Do it once, Do it right!!!!!! |
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| dsheps83 |
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I had a similar problem with my old cd player, i found out that when i conected my amp (first mistake left battery connected) cos i connected the rca cable to the amp then the positive apperently the amp will earth through the rca and because the rca tracks in the headunit arent big enough they burn out, therefore not having a good enough earth, an then hearing engine noise that changes with revs.
well thats one explanation. |
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| -GAS-MAN- |
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So many people ask these questions, maybe stickies are needed
_________________ it can be fast and cheap,but it wont be reliable |
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| braidy |
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The RCA earth fuse inside your headunit could be gone. Get some wire, fig8 will do, and put it on the ring of your RCA outputs from your headunit, and ground them. Fire it up and see it that fixes it.
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| smiley235 |
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{USERNAME} wrote: {USERNAME} wrote: get some bare cable and loosely twirl around the RCA's where it crosses or comes close to the power cables. and then earth that wire. Then wrap that portion in aluminium foil. so is this whats happening in the box??? i'm not sure how the box works, but the method I mentioned is how our control cables at work are shielded from induced voltage around power cables.
_________________ 178.3 rwkw
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