Hi all,
I’m sure that some one has covered this topic already and am sorry for repeating but I am stumped. And I’m a bit of a noob at this. I currently own a 95 TS Magna Executive and I am getting a loud squealing through the sound system. I am currently running a 4 channel Blautpunkt amp feeding the front and rear speakers and a 2 channel Alpine V12 amp running a single JVC neon sub. I’ve checked all the groundings and power conections and I’ve even re-run the RCA cables and nothing has changed the squealing. There is feed back from the actual CD player, as in the CD loading and spinning, but I've been told that some noise is normal. Any help on this matter would be greatly appreciated.

Alternator feedback?

search for "ground whine" or "altenator whine". It's been done to death.

welcome to the forums

Peace

Tim

ive already done most of what every other thread has suggested and nothing has helped the noise. Recently ive changed my headunit over with my girlfriends and the noise has stopped. ive taken the headunit (mine) back and got it looked at under waranty but they told me that there is nothing wrong with it. the only things i havnt done is install a RCA filter and change the altinator because of a lack of funding.

so u've checked the headunit ground?
made a new ground into the chassis?

yep done all of that, ive run a new ground to the chassis, sanded back the paint and everything and its still squealing like a banchee

check rca's again...

they will be crossing electrical intereference somewhere. doesnt always have to be the main poewr wire to ur amp ( i assume its not running near this anyway)

There's loads of intereference to be had by routing the RCA's through the centre console so if you can avoid the centre area (particularly underneath the cupholder and gearshirft area) the better.

have re run the cables in numerous places ie allong opposite sides of the car and down the center console and nothings changed it so im still confused about whats causing it. ive just bought a cap to ground suppressor to put on the altinator but after that i have no idea what to do other than sped out and buy a new H.U.

I've got the same problem dude. It's a real pain in the butt. Nothing helps in terms of just moving rcas or putting in extra earths etc. As far as I can tell, your crossovers will have a lot to do with the problem. If they're cheap they will induce a large amount of noise. Your distro block can also induce noise. But apart from that, it's likely to be your head unit. Not the grounding of it, so much as the actual tracks running out of it being crappy connections and the joints being prone to induced noise. What voltage are your rca outs too? Mine are 2.2v. On a bottom end pioneer unit, I'm just asking for noise. I've accepted that fact and I'm waiting until eclipse bring out an ipod interface and release their 06 stock before I upgrade. they've got 6.5v outs I think. Much safer. All the extra grounds, and clean grounds and proper routing of cable won't hurt, but for the noise you've got, it won't make a SCRAP of difference. Stop spending money on it is my advice. Nothing you can get will fix it, unless it's higher quality H/U, crossovers or a distro block. Shield them, move them, upgrade them, but anything else you do is a waste of time and money and pride.

well the thing that gets me is that ive put my girl friends H.U., which is a lower but newer model than mine(hers is Pioneer DEH- P4750MP, mine is DEH-P5650MP) and the noise stops, but as soon as i put my H.U. back in the screech starts again. The repairers have assured me that its not the head unit but i have my doubts cause they didnt have the actual wiring harness for it. Im going to get the supressor put on, cause thats what they recomended and if that doesnt work im taking the head unit back to be fixed or replaced under warranty

20 bucks says the supressor won't do anything if it's like the squealing in mine. Sounds like typical pioneer stuff. 2 years max life before the joints go dry. Are you running crossovers? If so where?

what exactly do you mean by crossovers, im sorta new to all this

crossovers are used with speaker systems that have more than one actual speaker (driver). In car audio, you usually find 'split systems' or splits. These typically comprise of a mid-bass driver and a tweeter. The mid-bass driver is the one that sits in your door, usually 6.5" or so in diameter. The tweeter sits wherever... in your kick panel, your door, wherever you want to mount it. They range in size, but somewhere around 40 - 50mm in diameter. They are a small driver that play the high frequencies in music. When your amp sends out it's musical signal, it goes to the mid-bass driver. This is fine, because the bass frequencies are played, and the high frequencies are unable to be reproduced by the mid-bass driver. The tweeter is connected in parallel with the mid-bass driver, so it receives the same signal. If we try and play the bass frequencies with a tweeter though, it will distort the tweeters dome and make it sound awful and probably break it. So we need a way of making ONLY the high frequencies go to the tweeters. Enter the crossover. A crossover is a combination of capacitors and choke coils in it's most basic sense. Capacitors allow high frequencies too pass, and block the low frequencies. Choke coils allow low frequencies, but remove high frequencies. So with most splits, there is usually a 'crossover' which may be wired up a couple of ways depending on what it is. It might come straight off your amp, or speaker outs, and have a 'high frequency' output, and a 'low frequency' output. You then run your mid-bass driver off the low freq output, and your tweeter off the high freq. This way, your speakers only receive what they're best at reproducing. Anything else will only make the speakers sound worse, so with a crossover, speakers can usually play louder, with more clarity. The other type of crossover is a basic and cheap one. It will be a capacitor and resistor circuit wired in series between your mid-bass driver and your tweeter. With this, the mid-bass receives the full signal, and the tweeter receives ONLY the high frequency content of the music. These crossovers are cheaper, and generally of poorer quality, and are more likely to induce noise into your system. Crossovers can be highly technical, as they have things like x-over points, and slopes to set according to your system. 'tuning' a system often refers to setting x-over points.

So there you have it! A basic overview of what a crossover is.

they are all running off one blautpunkt amp with the crossovers set on the amp itself. ive got the front standard speakers set to high pass 100hz with no bass, the rears are set to flat with 6db bass. the sub is rinning off a seperate V12 amp and i have set it with the low pass filter on and i have no idea what the crossover on that is