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 Post subject: Pioneer gmx 404 - Strange problem
PostPosted: Sun Oct 10, 2010 5:40 pm 

Joined: Tue Nov 24, 2009 12:48 am
Posts: 10
Location: New Zealand
Hey, I was installing this pioneer amp yesterday and had an unusual problem with it.

Wired it all up then plugged in my mp3 player using RCA to 3.5.

I could get no sound if Left and Right RCA were in the input

However, If I had one of the two RCA's plugged in and I touched the other to the Chassis of the amp I would get a signal to one of the speakers.

Worked for Left and Right.

Anybody had a similar issue?

Layout of amp


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 Post subject: Re: Pioneer gmx 404 - Strange problem
PostPosted: Sun Oct 10, 2010 8:45 pm 
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Joined: Sat Aug 01, 2009 2:08 pm
Posts: 277
Location: Los Angeles, CA
RichardWilson wrote:
Hey, I was installing this pioneer amp yesterday and had an unusual problem with it.

Wired it all up then plugged in my mp3 player using RCA to 3.5.

I could get no sound if Left and Right RCA were in the input

However, If I had one of the two RCA's plugged in and I touched the other to the Chassis of the amp I would get a signal to one of the speakers.

Worked for Left and Right.

Anybody had a similar issue?

Layout of amp




the thing with car amps is that they require a bit more volume then just an mp3 player can put out thats why it goes like this ... 1-mp3 - 2 stereo aux input(amplifies mp3) - 3 amp... so direct mp3 player to amp with 3.5 to male rca's its a bit of a toss up on the amp if it will pick it up... also u have to have the main gain all the way up... forgot also make sure u dont have the amps built in crossover on (nor on lpf or hpf )


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 Post subject:
PostPosted: Mon Oct 11, 2010 2:56 pm 

Joined: Tue Nov 24, 2009 12:48 am
Posts: 10
Location: New Zealand
Turns out I just had to run a wire from the ring of one RCA to the ground on the amp.


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