this is the way to play stereo with sub,u can also connect another pair of speaker cable from power amp to your sub if u have high level input from the subwoofer,make sure u check your sub manual
The problem is i need the signal from amp throught subwoofer to speaker with high level in put and output, and subwoofer need have varuable high pass filter ! is that any subwoofer have this function in the world?