I have a old Mirage PS-12-180 power subwoofer and recently it gives a continuously popping noise by itself when power on. The popping will becomes very loud during audio and video playback. I wonder what could be the problem and is very expensive to get it fix Thanks
Your subwoofer is not getting enough power, or it is grounding out due to a bad connection. What is powering the subwoofer? You might want to consider buying an AC to DC power inverter and a car amplifier to power your subwoofer. You connect the AC/DC inverter to your amp the same way you would in your car (+) to (+) and (-) to (-). The only other thing you will have to do is run the remote wire to the (+) on the amp. You can buy the AC/DC inverter at radioshack for $49.99, and all you really would need is a 200watt max amplifier and that would cost you about $10-$20.00 for a cheap one.
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Something getting hot probably means something shorted out.
You probably know that since you replaced the fuses already...
Can you give me some idea of what you do and do not know about electronics? Then I will say fewer dumb things.
When troubleshooting any electronic device, especially amps, open it up and look at the circuit board. Look for burned board and components. Then test to see if the burned/blown component had reason to blow (it probably did).
Often a shorted transistor runs too much current through some other component and the other component blows up.
Another cause, less common, is a shorted cap.
Look at the schematics if you have them, if not, you may have to create one to make sense of it.
Or take it to a shop where somebody does this all the time. The only one here went belly up in the last 12 months...
About the pots
Try blowing out the pots which are popping with some tuner cleaner. Use with caution, and always with everything turned off and power cords unplugged.
Pots do not usually make popping noises unless they are very old or live in a very dusty place...
I found the manual, but no schematics...
You might be able to get better, more exacting help on the Mirage Forum...
But maybe not, since the Subwoofer section gets less than one post per month, and the much busier Technical Questions section only has 23 in the last 12 months.
The stereo -jackbus is broken if your speakers won't work and your headphones are fine. The stereo jackplug holds a little switch at the back, which moves sideways if you connect headphones. Solution is very carefully opening back end of stereo connector bus and reassembling the switch
The amplifier in the sub as with any other amplifier has a capacitor in it. Essentially a battery that holds a charge. When you trun things off such as subs or amps with a powerstrip instead of the intended on off button, the power supply has been cut, but the capacitor is still energizing the unit. So it catches the noise in the line.
Ive seen this problem in alot of audio setups in vehicles but most peeps dont know this is not a good thing and will cause damage to your woofers or amp. 99% of the time it turns out to be as you said
that bad boy muting circuit. alot of these curcuits do use separate transitors or diodes as mute switches but most of them are directly from the Microproccessor. Only way to trouble shoot this is with a schematic and a good car stereo tech. Good luck