Humm in speakers

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benfouche

Member - Posts: 2

Joined: August 28, 2002

Location: United States

Posted: September 16, 2002 at 3:49 PM / IP Logged

I just bought a cheap Lanzar stereo to replace the stock one in my '90 bmw. After hooking everything up and taking her for a spin I noticed a wierd noise coming from just the back speakers. The noise increased and decreased as my rpms went up and down. I could hear it weather the volume was up or down and it almost sounds like my speakers (back ones only) are picking up my engine noise or something. If I'm just idiling then there is no humming sound but there is still a faint crackling. If the engine is off the sound is great. I already checked the ground wire and the speaker connections. Help please.....

joe

bberman1

Gold - Posts: 2,314

Joined: March 11, 2002

Location: United States

Posted: September 16, 2002 at 3:54 PM / IP Logged

Did you run your power wires next to any speaker wires or RCA cables?

Velocity Motors

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Joined: March 08, 2002

Location: Manitoba, Canada

Posted: September 16, 2002 at 4:40 PM / IP Logged

Check to see if you have absolute ground in your system in comparison to your HU and your amplifier as well as the RCA location.

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

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Glynn

Member - Posts: 36

Joined: June 27, 2002

Location: New Zealand

Posted: September 16, 2002 at 7:35 PM / IP Logged

firstly check if your BMW has a factory amp in the boot- behind panel on righthand side.

If so, you should only need to hook up one pair of speaker wires from the head unit- use the front ones. The BMW's factory fader control will split the output to the front and rear speakers.

If you still have noise, and have the factory BMW amp in the rear, you have two options- remove and fully rewire all the speakers from the factory amp. Or purchase a low power stereo instead og a high power unit. Or, find a replacement BMW factory unit.

I have a similar year 535, and it did have the factory amp.

Cheers,

Glynn

benfouche

Member - Posts: 2

Joined: August 28, 2002

Location: United States

Posted: September 17, 2002 at 11:28 AM / IP Logged

Thanks a ton I'll check on all that stuff!!

joe

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Humm in speakers

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