how many speakers to you have wired in series. if it's 4 and they are 4ohm speakers it means you are running about a 16ohm load. at 6 it's 24ohm and at 8 it's 32ohm. The channel will put out significantly less power at 16 ohm than at 4 and if you have 6 or 8 i am doubting the amplifier would even support it. have you tried wiring in a series/parallel combination. aka 2 sets in series and those sets in parallel. also, just another idea, but don't you want at least stereo out of your tower speakers instead of one mono channel. In an ideal setup, I would just wire them in parallel 2 on each channel. That should net you a 2ohm load, and providing the amp is 2 ohm stable, give you a lot more power.
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