noise filter

boxcarfan · Post by **boxcarfan** » Tue Jul 03, 2007 8:39 pm

so this is for my audio system but it can also apply to many other things....but i "hear" when i rev my enigne up thur my speakers....and ive done all i can to try and fix it...so with that said....if i put a noise filter on my power wire right before it goes to the amp would that get rid of the noise i am hearing???? cause its really damn annoying lol. thanks guys!

gilly02le · Post by **gilly02le** » Tue Jul 03, 2007 10:44 pm

i had the same issue.. i have a jvc deck, and 2 amps.. all of my speakers are amped.. i could run two speakers off my four channel and the subs off the mono amp just fine, but when i added the other two speakers onto the four channel, it started to put a wine in the speakers, that increased with revs. i bought a torodial inline filter, and installed it in the power wire before the deck, and voila.. fixed my problems.. ps i tried the rca cable noise filter, and it only reduced the sound, didnt eliminate it.. damn noisy alternator.

ewetho · Post by **ewetho** » Tue Jul 03, 2007 11:40 pm

Provide VERY GOOD grounds and separate the speaker wires from the power and grounds as much as possible and then possible a noise filter.

Also use good cable if not on the oversize would be good too.

boxcarfan · Post by **boxcarfan** » Wed Jul 04, 2007 12:13 am

dude, i have good grounds and everything...the ground is under the carpet in the trunk..i sanded it down to bare metal and used a self tapping screw so it should be grounded really good and im just amping the 6x9s...its only a 240 watt amp....i just wanted better sound quality lol and i run into all this trouble lol

gilly02le · Post by **gilly02le** » Wed Jul 04, 2007 11:50 am

the noise filter looks like this..

sorry i know its a crappy picture.. but yea.. this thing has to be spliced into the power wire for the deck, and then has a ground wire you must ground to the chassis somewhere.. this will eliminate all of your noise problems!

if you'd like, i can go out later and take my deck out, to show you how ive got it all hooked up in there..

boxcarfan · Post by **boxcarfan** » Wed Jul 04, 2007 12:40 pm

so three wires come off?...if so that means the end where only one comes out is the one spliced into the power wire and the other end where 2 wires come out, one is spliced into the power wire and the other is ground?

Craz1000 · Post by **Craz1000** » Wed Jul 04, 2007 11:29 pm

ok these steps will fix MOST alternator whine problems,

1) GOOD ground, the one you got in the trunk SHOULD be fine, mine is right next to the seat belts, if you want to test this use a multi meter and measure the voltage between your ground and the negative terminal of your battery it should be a drop of less that one volt, if more youll start to get whine but 1 volt will get you whine but not something that is rediculous, i forget what is an "ideal" reading but the less the better, if i remember its anything thats less than .1 volts is ideal?

2) your RCA's cant be closer that 1 foot from your main power wire, now if its subwoofers i usually ignore this rule when your installing because i still have yet to come across this problem in any of my installs, HOWEVER if your installing an amp for your mids and highs this would generate noise in a heartbeat, also if you use cheap RCA's you may get A/C induction, this is when your speakers/subs pulsate constantly.

3) keep your signal line away from any noise source, the noisiest part of your electrical system is your fuse panel, if you use a fuse to supply 12v to your remote wire this may introduse noise into the system however its unlikely.... but not impossible

if none of these work your gonna have to get a 'Ground-Loop Isolator' that will eliminate noise in your signal line