Which Behringer, the BFD Feedback Destroyer I'm guessing at that price? Used it happily on my subs but it was not too good when I tried it out of interest on my mains. I've used the DEQ2496, which is about Au$400, on my mains and its quite good if you feed it a digital signal, and very good if you feed digital out to a good external dac. I use the DEQ only on my subs now, and its probably a bit of an overkill, but I'm also using the 12db low-pass feature which is quite useful.
cheers
B