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reply to Tursiops_G
Re: random hiss from speaker - capacitor? That's what I thought too. That those little ceramic guys were pretty solid. Worth asking though, since that's the only visibly bad area of the board.
Might check for cold solder, wouldn't surprise me at all...
As for channels - yes, since the sub contains the amp circuitry, it seems to send a little hiss to L/R channels.