I have two CS+ 2039 subs/s1000 combo. I really like it and it sounds great!!! I currently have my combo configured to +6db over the mains. The mains are around +2 and the sub is -5 on the Onkyo calibration setting. I know this really does not matter though. I was watching the Phantom Menace and decided it to really crank it up. I turned my Onkyo 595 up to 60 on the volume and the bass was incredible! I then turned it up to 70 and my head began to itch!!! It felt like bugs crawling in my hair. Although at this volume it was about all my ears could stand. I did really like the feeling though. I would it be a bad decision to turn up the bass a little more so that I can enjoy bass like this without having to go up so loud in volume? What do you guys run your subs at? Also I do not know how to test the output. I had a tremendous amount of bass but my radio shack meter only registered 100db. Could that be right? My room is 20x18 with 12' ceilings. It opens up on almost one entire side and opens up in the rear with a place about 8 feet wide. How do I measure the output?