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Questions & Answers
Won't turn on
Simplest problem would be a blow fuse. Might be one on the face of the amplifier, but more likely inside. Remove the plate amp and see if one's easily visible, near where the power cord goes through the face of the amplifier.
Hum coming out of Front left/right speakers but not center
There is a chance that your wiring is producing this problem. Manufacturers don't always make equipment that is compatible with each other. The biggest problem's are "ground loops". Radio Shack has a non-electrical device that separates the common ground from all equipment. You basically connect it between your amp out's and in's - cables included. It is possible that other manufactures also make and sell this device too. It's main "Google" name would most likely be - "Ground Loop Isolators". If you are using the actually speaker outputs into your subwoofer amp input(s), check your polarity wiring again. Good luck with your system - it sounds like it'll rock when it's all setup correctly.
My speakers sound flat with no highs at all
I am trying to work out if you have damaged the speakers and amp too.
Have you tried a pair of headphones on the amp? If they sound ok then your amp is fine.
Assuming it is, then speakers have what's called crossover units in side each of them. This splits the sound into three parts. Bass, midrange, treble. The bass is handled by the woofer's, the midrange by a middle sized speaker or or it's combined with a tweeter, which of course handles the treble.
Connecting a 1.5 volt battery across any of the individual speakers will cause it to pop if working. If the speaker then is not getting sound then the crossover unit is to blame.
When you look at the crossover unit, it will have coils and capacitors (non polarised) on it. The bigger ones deal with the bass and the smaller ones treble. If you find a fault say on the crossover of the speaker, for example no treble comes out of it. Then start by replacing the capacitors. Use the same value as on the capacitor and remember they fit any way round.
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