Random engine noise in subs!?

Drifterboy3 · 30th December 2011, 06:30 AM

So I mounted my amp and subs a few weeks ago have been sounding awesome. Last week I unhooked the subs for more trunk space. Yesterday went to put them back in. The car was running but the subs were turned off at the head unit. When plugging in the +wire into the amp it sparked, and the subs hit. Now with the engine running I getting a pulsing engine sound in the subs. I checked the subs and I know they are not blown. And I know the amp is not in protection mode. Also the problem only happens when the RCA jacks are plugged into the amp. Please help !?!?

mike49504 · 30th December 2011, 06:35 AM

Sounds like you have a broken rca shield ground..

What kind of head unit do you have??

ODougbo · 30th December 2011, 06:39 AM

The sound may have been there before and you didn't notice it.

Did you move any wires around? Car setups can be very "noisy" but often easy to fix. Try moving wires around, do the easy stuff first.

Drifterboy3 · 30th December 2011, 06:43 AM

Pioneer, how would I fix a broken shield? And I never heard the sound before and you mean move the wires around like reroute them!

mike49504 · 30th December 2011, 06:51 AM

if its a pioneer you most likely have a blown fuse for the RCA ground shiels..

If you have a multi meter set it to ohms place one place 1 probe on the outer shield of the rca on the head unit and the other probe anywhere on the caes of the head unit do you get a reading??

ODougbo · 30th December 2011, 06:52 AM

E.g. I made a compact amp box for son’s Toyota and installed it, it was the noisy noisiest thing I ever heard, like an airplane engine. I took it back out, moved a few things around, it went away, completely (not even sure what I even did).

Don’t overreact by pulling every thing out, gently move power, RCAs and speakers wires around, obviously crossing over is not good.

Did you run the power wire and the RCA line on the “same side”, or together?

Drifterboy3 · 30th December 2011, 07:02 AM

Yes my power wire and RCAs are run next to each other. And same in my cousins car. And I have not had the problem until the spark. Also I'll check that in the morning. It's about 3 where I am now. So should I get a reading? If so what?

ODougbo · 30th December 2011, 07:06 AM

I don't know about other folks, I'm never going to run the power wires and RCA on the same side again, too risky.

Drifterboy3 · 30th December 2011, 07:13 AM

What is risky

mike49504 · 30th December 2011, 07:18 AM

If you saw a spark you more then likely have an open shield ground..

If you set your meter to ohms and do the test you should get a reading near 0 ohms if you dont get a reading at all then we will go from thier

30th December 2011, 06:30 AM	#1
Drifterboy3 diyAudio Member Join Date: Dec 2011	Random engine noise in subs!? So I mounted my amp and subs a few weeks ago have been sounding awesome. Last week I unhooked the subs for more trunk space. Yesterday went to put them back in. The car was running but the subs were turned off at the head unit. When plugging in the +wire into the amp it sparked, and the subs hit. Now with the engine running I getting a pulsing engine sound in the subs. I checked the subs and I know they are not blown. And I know the amp is not in protection mode. Also the problem only happens when the RCA jacks are plugged into the amp. Please help !?!?

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30th December 2011, 06:35 AM	#2
mike49504 diyAudio Member Join Date: Sep 2006	Sounds like you have a broken rca shield ground.. What kind of head unit do you have??

30th December 2011, 06:39 AM	#3
ODougbo diyAudio Member Join Date: Aug 2011 Location: Maryland USA	The sound may have been there before and you didn't notice it. Did you move any wires around? Car setups can be very "noisy" but often easy to fix. Try moving wires around, do the easy stuff first.

30th December 2011, 06:43 AM	#4
Drifterboy3 diyAudio Member Join Date: Dec 2011	Pioneer, how would I fix a broken shield? And I never heard the sound before and you mean move the wires around like reroute them!

30th December 2011, 06:51 AM	#5
mike49504 diyAudio Member Join Date: Sep 2006	if its a pioneer you most likely have a blown fuse for the RCA ground shiels.. If you have a multi meter set it to ohms place one place 1 probe on the outer shield of the rca on the head unit and the other probe anywhere on the caes of the head unit do you get a reading??

30th December 2011, 06:52 AM	#6
ODougbo diyAudio Member Join Date: Aug 2011 Location: Maryland USA	E.g. I made a compact amp box for son’s Toyota and installed it, it was the noisy noisiest thing I ever heard, like an airplane engine. I took it back out, moved a few things around, it went away, completely (not even sure what I even did). Don’t overreact by pulling every thing out, gently move power, RCAs and speakers wires around, obviously crossing over is not good. Did you run the power wire and the RCA line on the “same side”, or together?

30th December 2011, 07:02 AM	#7
Drifterboy3 diyAudio Member Join Date: Dec 2011	Yes my power wire and RCAs are run next to each other. And same in my cousins car. And I have not had the problem until the spark. Also I'll check that in the morning. It's about 3 where I am now. So should I get a reading? If so what?

30th December 2011, 07:06 AM	#8
ODougbo diyAudio Member Join Date: Aug 2011 Location: Maryland USA	I don't know about other folks, I'm never going to run the power wires and RCA on the same side again, too risky.

30th December 2011, 07:13 AM	#9
Drifterboy3 diyAudio Member Join Date: Dec 2011	What is risky

30th December 2011, 07:18 AM	#10
mike49504 diyAudio Member Join Date: Sep 2006	If you saw a spark you more then likely have an open shield ground.. If you set your meter to ohms and do the test you should get a reading near 0 ohms if you dont get a reading at all then we will go from thier

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