Theres a buzzing sound in my rear speakers... no idea what it could be from.
Alpine Type-R 6x9's on an Alpine CDA-9835 Head Unit.
Car is a 1996 Grand Marquis.
Replies (10)
P0werLifter on 08/5/2004 14:59:38
Is everything grounded correctly? When you did ground did you scrape the paint off the area then get some sand paper to sand it down a bit more to make sure there was no paint left? And have you grounded your electronics to the same area?
It sounds like a possible ground loop to me, I had the same problem a while back when i like 2 or three grounds.
Check everything and see if thats all good , Im sure one of the other guys will be here soon
~Jason
aposynthesi on 08/5/2004 16:08:14
I'm not sure if it would be the ground or not... it may be.
There is a loud pitched noise in the trunk, which may be interfering with the speakers... I don't know what its from though.
P0werLifter on 08/5/2004 16:36:29
Yah im not positive, Grounds is what have been the main culprit in most of my problems, or Alternator whine but all fixed. Im not really sure what that would be from unless maybe your car has a charge pump in your gas tank if its near your trunk might be making a sound. but thats just a wild guess,I know in >97 chevy trucks had a Fuel pump that made a whiney noise because it was a vein pump. Im not well versed in this kind of problem
One of the other guys will be here shortly
-Jason
Tinker18 on 08/5/2004 21:04:37
i had the same problem in my 93' chevy. except it was accompanied by no vocals what so ever, anywhere in the truck. come to find out, i had a speaker wire behind my dash panel that was groundin out to part of the frame. it also fried my HU, not sure how, but I had to replace it because the circuits were fried. might be a good idea to check you speaker wires, and make sure they have been cut on a peice of metal, or a hole burnt into them.
-KP
aposynthesi on 08/5/2004 21:55:46
It may be that... I'll retape my solder jobs, since that may be the problem.
swez on 08/6/2004 09:40:56
Is this a mechanical buzzing noise, speaker rattles or electrical noise only present when the engine is running?
Swez
aposynthesi on 08/6/2004 13:13:24
It randomly happens... no set time, usually when at lower volume levels, like the speakers are begging for more power.
It's more of an early 1900s radio sounding buzz.
swez on 08/6/2004 18:54:07
That sounds more like S/N ratio problems or ground loop between HU preamp and amplifier. If the RCA output is low (under 2 volts) and the amp gain is too high, we get more noise than signal. Have a few options here:
1. Make sure your HU and amp is well grounded
2. If HU output is low, consider a line driver or EQ/line driver combo
3. Try installing a ground loop isolator (1:1 isolation transformer)
4. Recheck you amp gain settings
Where is the gain set on your amp now? If below 1.0 volts (high
sensitivity) your amp will amplify noise as well as RCA signals.
Hope that helps bud!
Swez
PS Read this: http://www.bcae1.com/glisoltr.htm
aposynthesi on 08/6/2004 20:36:09
I don't have the amp connected yet... I have yet to do that, next week probably.
I think it has more to do with interference from the trunk than a S/N ratio problem, it was doing this when I had the old head unit installed too.
I'll resolder and use heatshrink instead of tape tomorrow and see if that does anything significant.
swez on 08/6/2004 21:20:15
This sounds like a mechanical issue and as you play them louder, the noise is masked by the SPL. Loose grills, loose fittings, gaps between speaker mount and speaker install benzel and a maybe speaker cone can be out of shape with tweeter hitting the woofer cone.
Had that happen on my last pair of 6x9's The tweeter/midrange hardware (plastic) collapsed a few mm and the tweeter magnet was hitting the MB cone metal dust cap. It sounded terrible and I finally removed the speakers to see that one was very badly damaged and the other was OK. Go figure huh? I tossed em.
Swez
Alpine Type-R 6x9's on an Alpine CDA-9835 Head Unit.
Car is a 1996 Grand Marquis.
Replies (10)
P0werLifter on 08/5/2004 14:59:38
Is everything grounded correctly? When you did ground did you scrape the paint off the area then get some sand paper to sand it down a bit more to make sure there was no paint left? And have you grounded your electronics to the same area?
It sounds like a possible ground loop to me, I had the same problem a while back when i like 2 or three grounds.
Check everything and see if thats all good , Im sure one of the other guys will be here soon
~Jason
aposynthesi on 08/5/2004 16:08:14
I'm not sure if it would be the ground or not... it may be.
There is a loud pitched noise in the trunk, which may be interfering with the speakers... I don't know what its from though.
P0werLifter on 08/5/2004 16:36:29
Yah im not positive, Grounds is what have been the main culprit in most of my problems, or Alternator whine but all fixed. Im not really sure what that would be from unless maybe your car has a charge pump in your gas tank if its near your trunk might be making a sound. but thats just a wild guess,I know in >97 chevy trucks had a Fuel pump that made a whiney noise because it was a vein pump. Im not well versed in this kind of problem
One of the other guys will be here shortly
-Jason
Tinker18 on 08/5/2004 21:04:37
i had the same problem in my 93' chevy. except it was accompanied by no vocals what so ever, anywhere in the truck. come to find out, i had a speaker wire behind my dash panel that was groundin out to part of the frame. it also fried my HU, not sure how, but I had to replace it because the circuits were fried. might be a good idea to check you speaker wires, and make sure they have been cut on a peice of metal, or a hole burnt into them.
-KP
aposynthesi on 08/5/2004 21:55:46
It may be that... I'll retape my solder jobs, since that may be the problem.
swez on 08/6/2004 09:40:56
Is this a mechanical buzzing noise, speaker rattles or electrical noise only present when the engine is running?
Swez
aposynthesi on 08/6/2004 13:13:24
It randomly happens... no set time, usually when at lower volume levels, like the speakers are begging for more power.
It's more of an early 1900s radio sounding buzz.
swez on 08/6/2004 18:54:07
That sounds more like S/N ratio problems or ground loop between HU preamp and amplifier. If the RCA output is low (under 2 volts) and the amp gain is too high, we get more noise than signal. Have a few options here:
1. Make sure your HU and amp is well grounded
2. If HU output is low, consider a line driver or EQ/line driver combo
3. Try installing a ground loop isolator (1:1 isolation transformer)
4. Recheck you amp gain settings
Where is the gain set on your amp now? If below 1.0 volts (high
sensitivity) your amp will amplify noise as well as RCA signals.
Hope that helps bud!
Swez
PS Read this: http://www.bcae1.com/glisoltr.htm
aposynthesi on 08/6/2004 20:36:09
I don't have the amp connected yet... I have yet to do that, next week probably.
I think it has more to do with interference from the trunk than a S/N ratio problem, it was doing this when I had the old head unit installed too.
I'll resolder and use heatshrink instead of tape tomorrow and see if that does anything significant.
swez on 08/6/2004 21:20:15
This sounds like a mechanical issue and as you play them louder, the noise is masked by the SPL. Loose grills, loose fittings, gaps between speaker mount and speaker install benzel and a maybe speaker cone can be out of shape with tweeter hitting the woofer cone.
Had that happen on my last pair of 6x9's The tweeter/midrange hardware (plastic) collapsed a few mm and the tweeter magnet was hitting the MB cone metal dust cap. It sounded terrible and I finally removed the speakers to see that one was very badly damaged and the other was OK. Go figure huh? I tossed em.
Swez
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