Hello, I wonder if anybody can help me, I recently bought a pair of pioneer dm-40's for my pc, they sound great but the trouble is the bass is not enough so I have tried to connect my old logitech subwoofer to my external soundcard. I have tried every type of connection but it will not work. The sub is the Z323 model which comes with the logitech speakers. Originally the speakers plugged into the sub which connected to the audio input on the soundcard but because I have no speakers plugged into the sub and a direct double rca to minijack cable connected to the sub connection on the soundcard it won't seem to pick up any sound. I am guessing it can't pick up sound without speakers plugged into it. I have tried looking online for a PC sub to use but they all seem to come attached with PC speakers, does anybody know the best model I could get or if there is any work around to using the logitech sub I have now. Any help is greatly appreciated.