I never got audio thump with my crown. I had the crown set to halfway and let my receiver do the rest by adsjusting the level. Two drawbacks to the crown. One being the fan noise which in my case I will have to modify the fans which is pretty easy and 2 the fact that you have to manually turn them off. There is a specific power supply that costs 20 bux which you can use to control the amp. Check this out:
http://www.bitsltd.net/smartstrip/home2.htm