whining noise when bass amp is connected

[speng 10+ year member]

Im running 3 amps, when I disconnect the bass amp, the whining disappears when the engine is runining from the mids and the tweeters which are also run on separate amps, (active system). when I connect the bass amp back up, the wining comes back through the speakers. Any ideas as to why this is happening

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[snoopdan 5,000+ posts]

classic ground loop.

 

[speng 10+ year member]

how do I solve this please, what do I do

 

[DidUHearThat? 10+ year member]

The amplifier is possesed by demons. It must be exersized by a catholic priest using holy water and a holy relic.

or...

Ensure your grounds are good, remove any ghetto splitters,"y" cables, or bad RCA cables. Use the amps pass thru RCA's instead. If that doesn't do it you can try a ground loop isolator for the noisy amp.

 

[speng 10+ year member]

Thanx, I will give it a go. I aslo have a active crossover and dsp upfront, I will check the grounds up there to. I know my amp grounds are good because they are running direct to the 2nd battery in the boot and the runs are short. Its only happens when the bass amp is connected

 

[DidUHearThat? 10+ year member]

Ensure the crossover and DSP are also properly grounded. Wiggle all the RCA connectors to see if the buzz gets worse or better. If so, replace it. Move audio cables away from power cables.

You have alternator whine because there is a difference in ground between two or more pieces of equipment. This difference in voltage is being passed thru your audio lines instead of your ground wire. Then gets amplified as buzz in the audio. This could be caused by a bad ground lead or bad audio cable, or defective/damaged equipment.

Or...

Your whine is caused by your components or cables picking up EMF noise from nearby power sources. Running audio lines next to power lines or near other EMF noisy electronics. This EMF is picked up as voltage in the audio line, which is then amplified as buzz in the audio.

 

[speng 10+ year member]

Ensure the crossover and DSP are also properly grounded. Wiggle all the RCA connectors to see if the buzz gets worse or better. If so, replace it. Move audio cables away from power cables.
You have alternator whine because there is a difference in ground between two or more pieces of equipment. This difference in voltage is being passed thru your audio lines instead of your ground wire. Then gets amplified as buzz in the audio. This could be caused by a bad ground lead or bad audio cable, or defective/damaged equipment.

Or...

Your whine is caused by your components or cables picking up EMF noise from nearby power sources. Running audio lines next to power lines or near other EMF noisy electronics. This EMF is picked up as voltage in the audio line, which is then amplified as buzz in the audio.

Thank you. I will have a look over everything and get it sorted. Great explanation