I just bought a Cerwin Vega LW-12 subwoofer and am having trouble configuring it. It has an a volume knob and a knob for frequency range between 40Hz and 120Hz. How does the Frequency knob work? Also on my Sony DTS/Dolby Digital receiver how do I configure the LFE? Is negative LFE more bass or less bass? I am new to all of this 5.1 stuff but I am learning. My manuals though don't seem to explain these things to me. I tried Halo and DOA3 on the Xbox with the subwoofer and I hardly heard a thing at all in the sub but I am not sure if it was my config or if the games doesn't support a sub but they seem to support it because my receiver auto detects the LFE from the game. How was that for a runon sentence? Thank you all for your help in answering these questions.