I just bought a polk audio powered subwoofer to add on to my BM2400 system. I pluged the second channel into the subwoofer with my two main speakers on the first channel. When I switch both channels on the sound quality of the speakers degrades and the sub just sounds like a mess. Also the amp is getting crazy hot. I disconnected the sub. Is there something I could be doing wrong? Can this system not handle the power drain to the subwoofer even though it has its own power supply and crossover?

The 2400 only has about 25-30 watts of output power per channel, which can be insufficient for large drivers. When I had a 2400, I tried it with many different speakers, and they are not powerful enough to power big speakers. Instead, the optimum speaker setting would be a efficient design in a small 2- or 3-way package.

Which polk sub woofer are you using? I wonder if you are using the correct input as if it is a powered sub-woofer, the power requirement should be minimal.

I'm using the PSW-10 (manual here: specs.retaildeck.com/CACHE/FILE17069.PDF ) I created the cable ends myself with screw plugs I got on ebay. I connected them to the second set of speaker outs on the 2400. On the sub I connected the bare wire to the "Speaker Level Input". The first speaker outs on the 2400 go straight to my Beovox s120s. I wonder if this could happen because I wired the plugs wrong? Could the amp overheat if the pos/neg wires are inserted wrong? Also, I'm assuming the fatter pin on the DIN plug is the pos and the smaller one is the neg?

The small pin is atually the positive one. Try re-wiring and see what happens!I do wonder if you may also have a small short!