How can I stop subwoofers from making a whining noise that follows engine RPM?
Question by Nick P: How can I stop subwoofers from making a whining noise that follows engine RPM?
I just installed an amp and subwoofers for my brother in his car stereo. When the car is sitting idle the subwoofers have a minor whine to them. When he drives the car the whine seems to go up and down in pitch following the engine RPMs. Does anyone have any idea as to what causes this and how to fix it? Thanks in advance!
Best answer:
Answer by Allen P
go to your local wal mart or audio store and get a noise filter you are getting the motor noise its commen with systems
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You need to filter the power going to the amp, because many cars create a “noisy” 12 volts from the alternator. You can get filters where you buy car stereos. Make sure the filter can handle the current you need.
Also have a good ground point to eliminate ground loops. In other words, some people install the subwoofer amp in the trunk and ground it to the car’s body. Instead, run a ground wire to where the deck is.
So, to review. Filter the power. Take the output from the filter (both positive and negative) to power both the deck and the subwoofer amp.
have you thort about a second battery hidden somewhere with a filter
jeez, ground loop isolator, goto al mart and pick one up for around 10 bucks. easiest and quickest way to do with out screwing around with your ground position, which could either be in the stereo, or in the amp, just get the isolator
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typically this is caused from having a power wire to close to the signal wire (RCA). In newer cars it is sometimes difficult to find a clear path for the RCA from the head unit to the amp without passing a “powered” wire.. there are a couple solutions, the best solution is to get a better RCA cable that will shield the signal and eliminate the interferance all together, the other option is to add a filter to remove the interference. place the filter near the amp and be sure it gets a good ground. The RCA’s simply plug into the filter and then the filter has RCA’s that then plug into the amp.
Let me guess, Pioneer/Premier stereo?! Or, just an off-brand one?
Even so… /
Get 2 small pieces of wire. Connect them to the outer sheilds of the RCA connections at the amp. Now, touch the other end to the ground terminal on the amp. You should hear a small ‘pop’ and the noise will be gone.
If this is the problem, should be, then you can solder the wires to the outer shields of the RCA connections and permenantly ground them out.
Ground loop isolators are just ‘band-aids’ to the real problem.
Interference from having RCA’s too close to power wires is a MYTH, period.