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I bought this product back in 2015 and the unit has decided to stop working on the right output line (yes I've checked the cables, the satellites. it's the output line). I assumed that I didn't have warranty, so I took it apart and checked the board. The white wad is an isopropyl wipe and I cleaned the board. But the solder on the board looks like it has re-flown and left patches on exposed PCD traces. I don't think this is the cause of failure, but may have contributed. Looking at the component side, nothing of note sticks out. But following the traces of the underside, I would guess the failure was the far left transistor that is screwed into the heat sink. Before cleaning off the board, they was noticeable residue surrounding the under side of the PCB around the left transistor. I'm guessing this is either a reason for failure it a side effect of a failure in the transistor itself. Hoping to be wrong about the transistor failure, I went ahead and reapplied solder and re-flowed where necessary and patched up the exposed traces. This didn't fix the problem.
Honestly I'm still a bit unsure on why my speaker has died, or why I wrote this. Anyone looking to sell just a base?