Question about Profile 600MSX Car Audio Amplifier

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Profile mono 1000watt amp

I have a 1000 watt amp, after a few seconds of playing it makes like a loud bass noise and it doesnt go away unless i unplugg it. They have told me that it's bcuz it doesnt have cooling fans so it heats up. but i dont know. Hopefully somebody can give me some advice.

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Posted on Dec 22, 2008

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Cooling fins won't make a difference when you first turn it on. You would have to play it loud for 10 of 15 minutes to get it hot.
It could be a bad ground from the rca's if thats how you have it hooked up.
Wiggle the plugs where they plug into the amp, if it cuts in and out it might have a broken solder joint where the conductor for the outer rings of the rca terminals is soldered into the main board.
If this isn't the problem something inside is shorted like a power supply or output transistor, cap, bias resistor,
If you are using speaker level inputs double check the wiring. Sometimes using only 1 wire for the left and 1 wire for the right will work better.
Never run speaker level wires directly into an rca input without a speaker level to rca level adapter.

Posted on Apr 18, 2010

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If you have over driven the amp by playing it real loud with the bass control turned up, it is very possible that you have toasted the output stages of amp.
Every time you boost a tone control by 3 db you have doubled the output power at that frequency. So if you are "coasting" along at a nominal 75 watts, the moment you boost the bass by 3 db the amp has to put out 150 watts at that low frequency.. Go to +6db and now the poor amp has to kick out 300 watts! And so on.

Rule of thumb - you never use your tone controls at very loud levels. Tone controls are there to compensate for the poor frequency response of the human ear at low volume levels - the Fletcher Munsen effect. At low volumes our hearing with the lows and high frequencies so when you play something at low volume you boost up the bass and treble to compensate for poor hearing. At loud volumes our ears respond properly.

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