****I was listening to a music CD and it had very rare frequencies that went to the sub. I put in a music DVD and I actually couldn't hear any noticable bass from the sub. I was playing "Santana: Supernatural" DVD. In one fo the reviews, it said the DVD-Audio version of that disc has some good bass. I don't have the ICBM yet, so I didn't think using SACD or DVD-A would be a good sound test yet.****

I don't know what kind of music you listen to, but any kind of CD music I play with my sub (diy Tempest) it comes into play big time. The sub is very responsive in SACD and music DVDs also (you definitely would notice the bass in Supernatural). I would suspect that something is amiss in your setup or the sub is not working properly. While listening to music and you turn off the sub, there should be a noticeable difference. Hopefully you'll be able to track down the problem.