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Engine Noise Through Speakers

Noise Issue

Engine Noise Through Speakers

Postby Vortec6200 [OP] » Mar 27 2011, 9:57pm

Let me start off by letting you guys know my set-up:

2011 GMC Sierra 6.2L Crew Cab
Installed (4) Infinity Kappa 6.75 Speakers in the Doors
Installed MTX Re-Q5 to integrate to factory deck
Installed Infinity Kappa Five Amplifier to power speakers (option for sub later)

Install is complete, but I am having a major issue with engine noise. I believe i have grounded the amplifier well, and per direction of MTX, have grounded the Re-Q5 at the same point. I have tried seperating cables and that has not worked. To compensate for the engine noise, i have tthe gains on the amp turned way down, almost to the point where it sounds no better than stock. Has anyone else had issues with engine noise on their stereo installations in the NBS trucks? Any help would be appreciated as I am going bonkers.

Thanks,
Eric
My Ride: 2011 GMC Sierra SLE Crew Cab - 6.2L Max Towing Package
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Related Topics  engine noise.   Engine Noise   Engine Noise   Help Identify Engine Noise   03 silverado 5.3 engine noise   Engine Noise - Lifter   5.3 engine noise, sounds like lifts, but seems to be....   Engine making a whining noise   HELP! Weird engine noise!! 99 Silverado 1500 V8 5.3L   Engine makes coughing noise when I release the gas pedal   Weird metallic "scrapping/ticking" noise coming from engine   speakers   Speakers   speakers 
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Re: Engine Noise Through Speakers

Postby davidbarrett » Mar 28 2011, 12:41am

From what I remember when I had this type of problem was for sure the grounds, make sure you use thick enough ground wires and keep them short. I hope this helps
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Re: Engine Noise Through Speakers

Postby WingNut » Mar 28 2011, 4:21am

Engine noise can also leak in if your antennae coax insulation has been damaged. Check that as well.
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Re: Engine Noise Through Speakers

Postby Vortec6200 [OP] » Mar 28 2011, 4:30pm

Thanks for the tips guys. I will look into those. Yesterday I tried using ground loop isolators at the amp with no luck. At this point I plan to do the following:

Re-run my amplifier power cable. currently it runs parallel to my right front and rear speaker cables about 2-3" apart. I plan to increase that distance to at least a foot. I also plan to replace the speaker wires with higher quality ones, maybe een sheilded cables. Along with that I plan to put a power line noise filter on +12V stereo input as well as the +12V input of the Re-Q5. Hopefully these changes will eliminate the alternator whine and i can turn the gains up on my amp.

One thing is certain, this is the last time I'm doing car audio on my own - what a PITA!!!
My Ride: 2011 GMC Sierra SLE Crew Cab - 6.2L Max Towing Package
Wifes Ride: 2013 GMC Acadia Denali
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Re: Engine Noise Through Speakers

Postby HartskiHartski is online! » Mar 28 2011, 4:40pm

I've always run the RCA's and power wires on totally opposite sides of the cab. Never had a noise issue.
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Re: Engine Noise Through Speakers

Postby davidbarrett » Mar 28 2011, 5:36pm

I agree with Hartski re the audio cables, but also make sure those ground wires are thick enough and are making a good connection. Good luck to you
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Re: Engine Noise Through Speakers

Postby morganw » Mar 28 2011, 6:22pm

Reading through the Q5 installation guide confuses me. Did you just tap the speaker wires or put the box inline?
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Re: Engine Noise Through Speakers

Postby Vortec6200 [OP] » Mar 29 2011, 3:02pm

I put the box inline. Basically I cut the speaker wires and spliced the ones from the connector on the stock radio to the inputs on the Re-Q5. You won't use all the inputs, those that you don't use just twist together and tape. I powered the Re-Q5 off my amp terminal block under the hood. I grounded it with my amp under the backseat. I have the remote turn-on wire off a RAP pin under the driver console. Hope this helps you out. Let me know if you have any questions and I'll do my best to point you in the right direction.
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Re: Engine Noise Through Speakers

Postby morganw » Mar 29 2011, 3:39pm

You could be getting engine noise from the remote wire. How are you getting the sound to the amp with the factory deck? Just trying to get a bigger picture to see possible causes.
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Re: Engine Noise Through Speakers

Postby Vortec6200 [OP] » Mar 29 2011, 4:32pm

morganw wrote:You could be getting engine noise from the remote wire. How are you getting the sound to the amp with the factory deck? Just trying to get a bigger picture to see possible causes.


Morgan, below is a wiring diagram of how I set it up. Just to note that this is for a 2011 Sierra, non-bose stereo.

Truck Stereo Wiring.pdf
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My Ride: 2011 GMC Sierra SLE Crew Cab - 6.2L Max Towing Package
Wifes Ride: 2013 GMC Acadia Denali
My Toy: 2006 Regal 1900 Sport Boat - Bowrider
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Extra Info: SLE 6.2L V8 4x4
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