after spending 3 hours, a new amp, new 8 guage wiring, and lots of smokes..... the lovely :doubt: guys at JB HI FI worked out that all they needed was a sound filter to get rid of the whining engine noise......

now, my question is........... does the sound filter actually lower sound quality? cos, before the filter was put in, i SWEAR everything was alot clearer. anyone?

Hey

I had MASSIVE problem with whining sounds before. First of all, make them go over everything again, like ground points, running cables correctly etc.

Later, I came down to the conclusion that I had dry joins on the RCA terminals on my amp.

Filters would probably fix your problem, but they also do happen to reduce sound quality a tiny bit. Its just a patch up solution...so tell the dudes at JB Hifi to fix the damn problem! if they installed it, then get your money's worth and tell them to fix the problem :cool: Id use the filter only as a last resort.

I have two new amps, and also angle grinded my ground point (just a bit) and now I have perfect whine free audio :D

they re grounded everything, and installed new wires, and also a brand new amp!!! and the whine was STILL there!!! so they used the filter as a last resort...... any one else have any ideas?

i just changed my rca's and everything was fine

i just changed my rca's and everything was fine

make sure they're 'twisted pair' as in teh wires inside the cable are twisted around each other. U can get some stinger hyper RCA's for like...cheapish.

where did they ground your stuff?

Yeah its a band aid solution. If its a big problem just take out every component and see where the problem is. Easiest way is to have a line going straight into your amp from a discman or ipod etc. That'll take care of the headunit. RCA cables near power lines are a big problem too.

Trial and error really.

If the sound filter works and your happy I wouldnt worry about it.

Peace

Tim

they grounded my stuff into just under the rear seats.

rca's and power lines are on different sides of the car.

well, the sound filter works, but IM NOT HAPPY WITH IT!! no, definately not happy. or maybe cos they fiddled with my the amp settings....... (and no, dont say re-tune it yourself, cos i have nfi how to)

anyone in SE VIC want to teach me how to tune my amp???!!!?!!

What's wrong with it? Just problems with the gains?

Setting gains isnt too hard.

Start with fronts (if you have a front amp) turn off everything else (sub amp). Turn the gain right down,
Turn the headunit as high as it will go without distortion. (some h/u's distort at 90% through rca's some have a clean signal all the way.
Then slowly increase the gains until the front speakers start to distort, turn it back slightly.

Repeat for the subs.

In this way you can get the full use out of the increments of your volume control, and also crank it knowing you won't damage your gear.

Peace

Tim

front amp? gains? again, i say..... i have NFI about car audio!!!!

OKay...

I'm in the same boat as you, Difference!
But what I want to know is how to tune front 6"s that aren't running through the amp! Everything else I reckon I can manage (I've just gotta get the right sized allen key to get into my amp's tuning part thingy!). But I think my 6's are running too much bass. I have no control over them from the amp!
And is it difficult to switch the negative and positive wires over? Part of the problem may be bass cancelation due to polarity... blah blah blah...
But I want to check it out without pulling my entire front end off!

Milquetoast, you want to highpass the fronts. There should be a low and high pass filter on your amp. Turn the low pass off and the high pass on. Then set the frequency to what suits you. (~100hz???) If you want less bass set the crossover higher. Generally unless you have problems with speakers distorting or with rattles, you want to have lots of bass in your fronts.

Depends what speakers you have and what they can handle.

edit, ah soz, They're not running through the amp. Well you can cap your fronts using some resistors. What speakers are you running? And What headunit?

Head unit is Pioneer 50w x 4 channel. The fronts are pioneer 6" two ways. I'd have to go look at the box to get more details, but the fronts were $99 on sale, and the H/U was in the $400 range. I think it's bass cancelation, because I stuffed around with the balance, and it only seems to sound like it's struggling in the left front.
As for the amp, I'm gonna grab an allen key and get to work on them as soon as I have some old clothes on!