Gound noise, Strange

Ok the subject is a 90 tercell. The problem, ground noise out of just the front left speaker. It is rpm related noise. The system is a pioneer 7300 deck, orion cs100.2 connected to spl 4 inch speakers, pheniox line driver connected to a orion 150.2 which runs a single 4 ohm MTX 12". What I have dont to trouble shoot. All the standard stuff, you know like check grounds, rca's etc. I tried switching the 100.2 for the 150.2 and it still did it, I also even disconected the amps from the speakers all together so there was no signal going through them and there was still the noise. I replaced all the wire running from the back of the car to the crossovers and from the crossovers to the speakers and the noise continues. the power wire runs down the drivers side of the car and the speaker wires run along the rcas on the passanger side. The speaker wires then travel accross the dash to the crossover and then on to the speakers. This is riving me insane because I cant hink of what else to try. I also checked to see if the terminals on the speakers were even close to touching anything and they wernt but to be sure I even taped up the terminals on the speakers. I was a little desperate by this point because this whole situation stopped making sense to me when I unhooked the amps all together. Any one with insite on this, and would like to shed some light on the situation, I would be very appretiative.

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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

You eliminated, as a potential problem:   noise from the amp (both).  The noise may  be picked up at the crossover.  Can you switch wires at the two dash crossovers and see if the noise then comes from the right speaker? 

The noise will be generated from the crossovers, move the crossover totally away from any engine computer, speaker magnet, power / ground wire and see what you have for noise. I have come across this before and it baffled me for years until I figured it out by accident one day (long before forums existed - cough  cough I must be getting old). I have also had singing crossovers, something I have been trying to duplicate for years now, yet no luck.

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Top Secret, I can tell you but then my wife will kill me.

Indeed, crossovers are a likely source, but I've also seen this with a stray strand from a speaker wire touching ground.  In one very strange instance I had a speaker system (not in a car) playing an AM radio station sitting there all by itself with nothing at all connected to it.  It turned out to be a shorted capacitor in the crossover.

tried switching the crossovers from side to side. pulled the crossovers out on the floor of the car away from everythin and it still did it.

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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

Bad ignition wires, coil or sparkplug?

mabye, but isnt it usually a popping noise, not a whine, when its the ignition wires, and wouldnt it be both speakers?

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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

Yes, but you never know.  When all the normal stuff has been eliminated, you have to start looking for the weird stuff.  Have you tried pulling the speakers out of the doors and seeing if they whine when they are, say, sitting on the floor?  It could be some sort of electrical signal in the door that the speakers are picking up.  Does the car have power windows?  If so, try pulling the fuse for the windows and see if the problem goes away.  If it is electrical induction noise from something in the doors, sounds like a good candidate for kick panels...  Also, try eliminating the line drivers.

In a terrcel the speakers are located under the dash and the tweeters are located on the dash. The person who has the car has a set of MB quart components to go in kickpods so I dont really wanna move them there. I guess I should have mentioned that the sound comes out of the tweeters and not the woofers. However the sound could be out of the frequency range of the woofers so I cant even completly rule that out. Ill tell the customer to replace his spark plug wires and see if that helps. If it doesnt Im gonna set fire to the car. If anyone has any ideas on a different way to fix the problem, or on an inventive way to dispose of the car, im still listening

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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

It's the tweeters in the dash eh?  Then electrical interferrence is definately a possibility.  You may have to run shielded speaker wire and back the tweeter magnets with a piece of MuMetal magnetic shielding material.

It ended up being the frigin wire for the tweeter. I had replaced the wire but didnt change its route. I cant see what is actually interfering with it as it seems to be in a fairly open area but none the less I took out the instrement cluster and rerouted the wire behind there. No more Noise, Im so Happy!!

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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

Cool.  Magnetic induction and RFI.  It's always a big time bitch to find.  Glad you solved the problem!

is the crossover new? I have the problem before where the RCA input on the crossover has a very small crack at/on the main board.  <shrug>

The crossovers Im talking about are passive crossovers on the speaker lines not the RCA lines.

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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

Grrrr what is going on with my posts today, they are not posting for like an hour + after I send them