Subsonic Filter

[Confused]

Thanks Matt, well you live and learn, and if red book CD can go below 20hz, it does make some sense of what I am seeing with the cone movement. However, I don't think SAM is pushing the drivers outside of their design envelope, in fact, one way of eliminating the specific issue with that track is to crank up the volume. I guess SAM is then calculating that the boost at this very low frequency would indeed be out of the drivers range, so it eliminates it.