Like Bill, I am amazed at how a good speaker with moderate ( say 40 Hz) measured response can sound so powerful in its bass response playing music. Now I have heard a great full range system recently, the Linkwitz Labs Orion. Really impressive speakers. But with non classical music, and more typical instruments, what is really necessary? I don't feel like I'm missing anything when I listen to jazz or rock music. I believe the Orions were down about 6 Db at 20 Hz. I'm willing to bet nobody feels that a speaker like a Pro 7 Pi is lacking anything in low frequency response. What is going on with our perception of bass? Are we responding to psychoaccoustic influences relative to SPL or what?

Cheers,

Steve