I've used the same CD and have not noticed what you describe. I'd call Axiom.

For those who have used the realtraps cd with the 500 or 600... The cd has sine waves starting at 10 Hz. Where do you start to get noticable audio out of the sub?

For my 500, I get a little at 19 but mainly 20 Hz and up. This agrees with the spec on the unit, but just curious what others experiences are. I wanted to be sure my CD player wasn't limiting things.

Thanks.

-Dave

M80s VP150 QS8s EP500s
ravenmanor.com/cinema/