I recently picked up a Berhinger Feedback Destroyer Pro for use as a parametric EQ with my sub after hearing they would be discontinued. After a few hours of fiddling I must echo the sentiments others before me regarding bang for the buck. I've had some room issues due to limited placement options and have always been bothered by the "hot spots" in the frequency response curve. They served to limit overall output level settings and just plain sound bad when listening to bass scales on Jazz recordings and other material. I was able to rid myself of these hot spots and achieve the desired frequency response I was looking for, but I found an added bonus as well. Removing the unwanted frequencies really opened up the sound of the mains during 2.1 listening and removed a cloud from in front of the center channel in 5.1 mode. I listen to the system primarily in 2.1 configuration with CD's and digital cable radio. I was amazed at the amount of additional detail and imaging accuracy that was revealed by making a few changes with the BFD. Makes me want to go through and listen to all of my old stuff again to hear what I've been missing. Set to 5.1 for movies I noticed that the cohesion between the center and the mains/surrounds was improved quite a bit. Sound now transfers seamlessly from side to side and front to back without any detectable difference as it passes from center to surround. I had always suspected the center channel of being a bit dull in frequency response, perhaps missing something on the high end. Turns out it was just stuffed with low frequency over run from the sub.

Anyhow, a thanks to the people who've shone the light on this before me, especially Sonnie Parker and Ken Bruce for their thoroughly detailed write-ups about this unit. At $100 you really can't go wrong.