I'm trying to determine the FR of my subwoofer's output to see if some EQing would be beneficial for me. I am confused on a couple issues, though. First, does anybody know of a Doby Digital or DTS formated test cd/dvd that may be available. I have a stereo bass mechanics test disc. Should I measure sub FR in stereo mode or pro-logic? It seems I get much different sub response between these modes. I run all my speakers small, and my Denon has low pass at 80 hz. My svs is powered by a Kenwood 175 wpc amp. My other question is to how loud should I take my measurements. My CD has a female voice that tells the FR in 5 hz increments (actually quite helpful). But if I have the volume up high to measure my sub, the voice is very loud!!! It's painful. Should I run in stereo, and turn speaker A off (then I get sub only)? I'm not sure if there is a change to output to sub when I do this though. There might be. Thanks for your thoughtful answers. I think something sounds a bit missing from my SVS experience, and I wanted to make sure I am measuring FR correctly before looking into EQing.