Question about Sony XM-SD46X Car Audio Amplifier

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Whats this? I have a sony 4 channel amp that the sound comes in and out. The blue light on it turns red whenthe sound goes off what does this mean.

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Louie Role

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Hi, might be several reasons: 1) to loud, the amp might be auto protecting; 2) one of your 4 speakers has a developed an intermittent problem, either open or coil grounding to magnet; 3) the pigtail (wire from terminal to coil) might be occasionally touching the metal body of the speaker (just carefully bend/move the pigtail out of the way); 4)impedance mismatch (speaker ohms too low for the amp) or too many speakers connected (check/replace or lessen); or 5) it is possible that the amp is not getting enough power from the battery/electrical system or a loose ground somewhere (although a bit unlikely). Hope this be of some help. Please let us know how things turn up. Cheers.

Posted on Apr 15, 2007

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sounds as though (at high volumes) the amp thinks it has a short circuit. This may be caused by the way you have them connected.
Speakers have a resistance and amps needs a certain amount of resistance to function right (too little resistance = short circuit)
The way it works out for the speakers is, if the two are connected to one amp output channel, the amp will see half of the resistance of a single sub. (4 Ohms/sub amp sees 2 Ohms)
If the amp instructions say that it's 4 Ohms/channel then you need to use 1 channel for each sub.
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