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Location:
Gold Coast
Registered:
June 2004
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 Audio installation problems
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Sun, 24 October 2004 04:56
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I have a problem with my Head unit and it has to do with an unfortunate mistake.
I was installing the new head unit along with an amp and sub and it was all going sweet until it came time to turn it all on. The head unit worked fine, the sud was working perfectly sitting on the back seat, un boxed. But after we spent the better part of 2 hrs mounting it in the position of the factory sub (JZZ30s have them on the shelf behind the back seat in the middle of the shelf) and running the wiring to it we turned it on and got a fucked up noise, really loud buzz and crack all at once.
Turned it off really quick and inspected all the wiring to make sure it wasn't a crossed wire or something stupid like that and found the 2 terminals on the back of the sub (positive and negative)were touching the metal frame of the car. So we thought we had fucked the amp. Tested the sub and amp on another head unit , worked fine , tried a different amp and sub on the head unit in my car, same gay noise...
Tried the other line out on the head unit same gay noise occurred. Any idea what I've fucked up? Is there a suppressor built into he line outs that i have screwed and if thats the problem does anyone know how much this might set me back to get fixed?
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Location:
Melbourne
Registered:
November 2003
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Re: Audio installation problems
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Sun, 24 October 2004 05:38
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might have killed the amp in the head unit, but then again u probbly wont get anysound out of it at all  .
if the head unit is a new one just brought take it back, say it was like that 
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Location:
Sydney, Hurstville, Pensh...
Registered:
August 2004
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Re: Audio installation problems
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Sun, 24 October 2004 05:48
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noise on when engine running or all the time
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Location:
Brisbane
Registered:
July 2004
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Re: Audio installation problems
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Sun, 24 October 2004 05:59
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Well obviously the problem is in the Head unit. You probably will have blown some protection diodes of sorts, but with surface mount technology, who knows. 1 thing for sure, it'll have to be opened up for a lookee and unless you have some nice tech gear you prolly won't want to attempt it yourself. The bits won't cost anything it's the labour which will be the killer, but it shoudn't take a quality tech more n a hour.
but like toyoda said, if it's a newbie, take it back.
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Location:
Gawler, SA
Registered:
August 2003
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Re: Audio installation problems
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Sun, 24 October 2004 06:02
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The RCAs which your amp (to run the sub) is running off would be connected before the headunits own internal amp so I doubt that would be damaged.
But have you tested running some smaller speakers off the headunit? If the noise occurs on those speakers too then it means the damage is in the circuits before the internal amp. By then Id be assuming youve done some rather serious damaged.
From what you did though I would have guessed that it would have damaged the amp before the headunit itself.
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Location:
Gold Coast
Registered:
June 2004
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Location:
Dubbo NSW
Registered:
June 2004
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Re: Audio installation problems
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Sun, 24 October 2004 08:32
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try new RCAs, sheild could b fucked or grounding.
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Location:
Gold Coast
Registered:
June 2004
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Re: Audio installation problems
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Sun, 24 October 2004 09:04
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tried 3 diff types of RCAs also grounding was changed several times , and power supply was taken straight off the battery. It is definitely the head unit. I'm 100% sure of that much , just wondered if anyone knew anything about how the line outs worked and what might be wrong with them.
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Location:
Sydney
Registered:
January 2003
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Re: Audio installation problems
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Sun, 24 October 2004 11:59
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You might have blown some noise suppression caps in the H/U somewhere, this would result in a nasty buzz.
Another thing to try is to stick at thing called a...."ground loop isolator" in between the H/U and the amp, or amp and the sub. All it is a little black box that has 2 RCA plugs on each side, it's got some magical properties that help it elimate "noise". It's probably a series of caps, or something I dont really know, but it's helped me get rid of a buzzing noise to my sub.
Ground loop isolators used to be availble from Dick Smith for about $25, if dickies dont have them try Jaycar or an audio place.
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