If you are hooking an amplified subwoofer to your side speakers and you have an option of speaker level versus line level, which is the best way ? If you are using speaker level connections, is the subwoofer amp powering your side speakers or just the sub ? Is your main amp powering your sides ? and sub amp only powering crossed over frequency below set point or how exactly does this work ? Im thinking about having powered subs hooked up to my side speakers crossed over with the sub high pass crossover and I dont want to denegrate the sound quality of my sides by powering them with the sub amp ??