Weird humming prob

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ashcan

Member - Posts: 10

Joined: October 19, 2004

Location: United States

Posted: November 16, 2004 at 2:38 PM / IP Logged

Okay I have a single 12" Memphis Studio sub and a Depth charge 200w amp....Sometimes when I get in my car and start it up I get this weird humming sound...Kinda sounds like a grinding humm.....I have umplugged the RCAs from the amp and it still happens so its somewhere on the amp side...Is there any thing I can check or do to resolve this problem....

The problem has just recently started....I guess about a month ago...before that it was fine....No humm...

Help Please...

Ravendarat

Platinum - Posts: 2,806

Joined: February 23, 2004

Location: Canada

Posted: November 16, 2004 at 2:50 PM / IP Logged

possibly a poor ground, is it rpm related, could also be a problem with the driver but I doubt it

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

maaudio1

Copper - Posts: 50

Joined: November 14, 2004

Location: United States

Posted: November 17, 2004 at 11:02 AM / IP Logged

^That would be my first guess. Ground problem. Recheck or even relocate you ground on the amp and see if that helps.

2004 Mazda 3s Hatchback

2- MTX 4500 8" subs powered by MTX 251D

ashcan

Member - Posts: 10

Joined: October 19, 2004

Location: United States

Posted: November 18, 2004 at 7:07 PM / IP Logged

OK....I moved my ground to the Seatbelt bolt that goes into the frame....

I took a dremel grinder and took it down to bare metal.....So its grounded good now....

I still have the same weird humm....It does it for a while then it will stop....Its not RPM related you can rev the motor and no change in tone or frequency of the hum.....I am starting to wonder if my amp is going bad and this is the first sign.....

It still plays fine and sounds good but when you turn it down you can hear it...

Any more suggestions....

uthinkuknoaudio

Silver - Posts: 760

Joined: October 08, 2004

Location: United States

Posted: November 18, 2004 at 7:15 PM / IP Logged

what guage of ground wire are you using? It could be too small, or another problem could be that you have bad RCA's.

"I don't play games. I play Nakamichi and that for real yo" - Probably some japanese kid said this in the early 80's trying to sell stereo out of his trunk lol.

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ashcan

Member - Posts: 10

Joined: October 19, 2004

Location: United States

Posted: November 18, 2004 at 7:21 PM / IP Logged

Its a 200 watt amp so I used 8Ga pow and ground....

Its not in the RCAs....I have unplugged the RCAs from the amp and you still have the sound....

Could the remote wire cause A noise....I am running a factory headunit so I used the ACC pow Wire from behind the radio to turn on the amp....

Any other ideas???

archemedes

Copper - Posts: 172

Joined: September 08, 2003

Location: United States

Posted: November 18, 2004 at 7:25 PM / IP Logged

pull the amp and bench test it, could be internal to the amp, and you could change all the wiring and still not find the problem

uthinkuknoaudio

Silver - Posts: 760

Joined: October 08, 2004

Location: United States

Posted: November 18, 2004 at 7:26 PM / IP Logged

"Ditto archemedes" - Get it bench tested, i really don't think your remote line could make a difference on it. Your ground seems fine for a 200 W amp ... interesting...

"I don't play games. I play Nakamichi and that for real yo" - Probably some japanese kid said this in the early 80's trying to sell stereo out of his trunk lol.

xTimx

Copper - Posts: 354

Joined: September 13, 2002

Location: Canada

Posted: November 18, 2004 at 7:27 PM / IP Logged

does it do it when the car is shut off as well? try that, and if it still does it then :P sorry i have never heard anything like that. you may want to check your ground (again) to see if your connections are corroded. (even on the amp). make sure you dremel the actual bolt too. make SURE you have a good connection.

xTimx

maaudio1

Copper - Posts: 50

Joined: November 14, 2004

Location: United States

Posted: November 18, 2004 at 8:13 PM / IP Logged

Starting to sound like an internal problem on the amp. If you know somebody that might let you borrow an amp for 5-10 minutes. Hook it up and see if it goes away.

2004 Mazda 3s Hatchback

2- MTX 4500 8" subs powered by MTX 251D

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