OK, I've tried the usual tricks on this problem and it has not gotten any better. It is a new install on a 2012 Mustang. JVC KW-XR810 HU, ID Q450 for mids/tweets, PG Xenon 200.2 for door midbass, Kenwood X1R for sub, RF rca cables. All 3 amps grounded to same grounding point under a rear seat mount bolt. Sanded down to bare metal for the connection.
Symptom is a very high pitched constant noise. I'd guess its in the 15hkz range since I've had 1 person get in the car and told me they couldn't hear it at all. To everyone else it is rather loud. The sound does not ever fluctuate, not with RPM, not with moving the cables around, nothing.
I've tried moving cables around, tried grounding the amps to another bolt under the rear seat and the same noise persisted.
Looking for any ideas you may have. I've never encountered a noise problem like this before and searching didn't turn up much either.
OK, I've tried the usual tricks on this problem and it has not gotten any better. It is a new install on a 2012 Mustang. JVC KW-XR810 HU, ID Q450 for mids/tweets, PG Xenon 200.2 for door midbass, Kenwood X1R for sub, RF rca cables. All 3 amps grounded to same grounding point under a rear seat mount bolt. Sanded down to bare metal for the connection.
Symptom is a very high pitched constant noise. I'd guess its in the 15hkz range since I've had 1 person get in the car and told me they couldn't hear it at all. To everyone else it is rather loud. The sound does not ever fluctuate, not with RPM, not with moving the cables around, nothing.
I've tried moving cables around, tried grounding the amps to another bolt under the rear seat and the same noise persisted.
Looking for any ideas you may have. I've never encountered a noise problem like this before and searching didn't turn up much either.
Do not use a seat bolt. They are zinc plated and that can be a problem. Yes for real. I would not have believed it either but it happened to me. Lycan gave me the explanation why which was a bit over my head.
Yeah, I've seen that before, but that is about the alt noise that changes with RPM. The noise I have is constant. It never changes in volume or tone.
Quote:
Originally Posted by bobduch
Do not use a seat bolt. They are zinc plated and that can be a problem. Yes for real. I would not have believed it either but it happened to me. Lycan gave me the explanation why which was a bit over my head.
I'm not sure if I can avoid that on this car if that is the case. All the bolts under the back seat and the seat belt bolts are of the same size painted black. I had zinc plated bolts before on my Subarus, but the ones on the Ford are black paint....... Not sure what metal is under the paint. Right now, though, I have the ground eyelet between the frame and the bracket for the rear seat. Not sure if it is even contacting the bolt right now. I have also tried it on top of the bracket in direct contact with the bolt and the same noise was observed.
I tried finding another bolt in that area with no success. Just some small screws that may or may not even contact the frame.
Earth straight to the chasis, seat bolts are painted before assembley=poor contact. Find a nice flat area, check nothing important underneath and sand it back to bare metal and drill through then bolt down.
Also does the sound come from all speakers or just one pairch? If just one pair/ch then check you don't have the speakercable pinched anywhere-spent a few hours trouble shooting a similar noise and found the customer had accidentally bolted his tweeter wire under his seat belt bolt-removed the wire and cured the issue.
Earth straight to the chasis, seat bolts are painted before assembley=poor contact. Find a nice flat area, check nothing important underneath and sand it back to bare metal and drill through then bolt down.
Also does the sound come from all speakers or just one pairch? If just one pair/ch then check you don't have the speakercable pinched anywhere-spent a few hours trouble shooting a similar noise and found the customer had accidentally bolted his tweeter wire under his seat belt bolt-removed the wire and cured the issue.
Right now the eyelet for the groundcable is sandwiched between the rear seat bracket and the chassis (both sanded to bare metal). I doubt it is even touching the painted bolt. How much (if any) does the bolt itself matter if it is not being used as a contact surface?
I have one set of RCAs run to the ID Q450.4 (2ch input on the amp switch) for mids and tweets. The noise comes only through the tweeters (both equally as loud) as the noise is far too high pitched for my 4" mids to reproduce even if they are seeing the same interference/input/noise/whatever.
Why not skip your chassis altogether and run a dedicated 1/0 or what have you all the way to the battery - wire is cheap in comparison to all the gear cost. Then you just need a distroblock to terminate all your ground wires.
BTW no has mentioned turning the gain down a bit - have you tried?
Sounds like noise floor.
Kenwood DNX5120 - Audiocontrol HPX - G&S Designs GX3 - PPI Art Ax400 on JBL tweets - PPI Art Ax400 on Focal Utopia 6w2's - JBL 1200.1 on 2 x JBL P1222s
Constant high-pitched noise
Linear Mode
