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Old 11-14-2008, 11:18 AM   #1
obs2008
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Default just installed new stereo and have a couple problems

ok, so i just put a stereo in my 08 wagon. mtx re-q5 hooked to the stock head unit, infinity 5 channel amp w/12 guage speaker wire runnin to jl 6.5's in the doors and a rockford 10". i ran all the wires nice and neat and did everything right, all connections are solid. now my problems are, when accelerating i can hear a low volume, high pitch whine that goes along with the engine revs. and when settin up the system, i had to turn the gain way down on the amp cause it was humming through the speakers even with no music playing. any ideas on what the problems can be?
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Old 11-14-2008, 11:32 AM   #2
Audiosavvy
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I'd bet money that the culprit is the RE-Q5. Where is it grounded? Where and how is the amp grounded? I'd start by making sure that the RCAs are plugged all the way in, nice and snug.

Is there a reason you didn't go with an aftermarket head unit? You would likely not have that problem, but you'd have better sound and more control..... just a thought...
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Old 11-14-2008, 11:39 AM   #3
Aaron'z 2.5RS
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IDK if I would blame the MTX unit.. I mean it's designed for what it does.. BUT, the ground connections could be a little "off" as you know..

OP, Even with as carefull as you were with the install, not all grounds are the same, this opens you up for a ground loop, which is typical of the whine you hear that is motor RPM related..

Try grounding the MTX unit in a different location.. find something that is well connected to the car.. some of the metal in the dash, could be held in place with as little as a few spot welds... if you find a more solid ground, also make sure you scrape away the paint right under the connector.. add a little dielectric greese as well to keep corrosion at bay..

you don't have to perferate the car looking for a ground either.. place the ground in different locations, if you get a better signal (losing the whine) then you can scrub away the paint and make a solid connection..
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Old 11-14-2008, 11:55 AM   #4
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I didn't mean that the unit ITSELF was the problem, but that it is the source of the problem.... if that makes sense....
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Old 11-14-2008, 12:08 PM   #5
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Crystal..
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Old 11-14-2008, 02:43 PM   #6
obs2008
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ok cool. right now i have it grouded through the ground wire off the stock head unit, i guess the mtx should get is own ground? and what about the humm throught the speakers when i try to turn the gain up? same thing?
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Old 11-14-2008, 02:43 PM   #7
obs2008
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i didnt get a stock head unit cause i wanted it to look factory if someone looks in the windows, but iv been considering upgrading to a non factory head unit at some point
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Old 11-14-2008, 05:28 PM   #8
Battlesnake99
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yo lurker id say just try running it off of a separate ground... those 18ga wires can only carry so much current...

then again i probably have no idea what im talking about :P
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Old 11-14-2008, 07:42 PM   #9
remeolb
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Ground the MTX and the deck at the same point as the amp.
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Old 11-14-2008, 09:56 PM   #10
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You could also try grounding the outer connecter on the end of your RCA's. Its not a permanent fix but a helpful diagnostic tool. If the noise goes away its almost always a ground loop issue. I had an Alpine EX-10 that had ground loop issues when they were first released and the only way to eliminate it was grounding the outer shields of the RCA's. Fortunately the problem has been fixed internally now and thats not an issue anymore.
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Old 11-15-2008, 11:33 AM   #11
obs2008
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Quote:
Originally Posted by Battlesnake99 View Post
yo lurker id say just try running it off of a separate ground... those 18ga wires can only carry so much current...

then again i probably have no idea what im talking about :P
stalker!!!
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Old 11-15-2008, 11:52 AM   #12
remeolb
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Quote:
Originally Posted by obs2008 View Post
stalker!!!
seriously.
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Old 11-15-2008, 11:56 AM   #13
obs2008
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Quote:
Originally Posted by remeolb View Post
seriously.
lol well im off to try to fix my system, ill report back later
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Old 11-15-2008, 12:01 PM   #14
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Pictures please.
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Old 11-15-2008, 12:11 PM   #15
Battlesnake99
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haha well i mean it wasnt THAT hard to figure out... in fact you talked about that same audio processing unit about a week ago :-P
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Old 11-15-2008, 05:04 PM   #16
remeolb
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Any luck getting rid of your noise?

I just did a similar install to yours with an AudioControl DQL-8 instead of an MTX RE-Q. I grounded the amp and the AudioControl to a seat bolt for the drivers seat. I left the factory ground for the headunit. I have no noise issues at all. Hope this helps. Best of luck.
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