Depends on your room and your system. My system is open baffle and subwoofer based. Thus some sort of crossover is required. Initially the was done with plate amps on the subwoofer. Now using a Dayton Audio DSP-408. It's inexpensive, so I imagine there's some SQ degregation. However, being able to cater settings like HP filters, LP filter, delay, and EQ resulted in substantial improvement. I'm pleasantly surprised. I would try a DSP unit from a vendor that is returnable. Play with it for a while and let your ears judge.
What are your opinions of DSP's for speakers
This seems to be a popular trend with many speaker brands. Some have internal amplification with DSP's and some have external implementations of it like Legacy. I have heard some good results with it being used but don't necessarily like the idea of everything being digitized for the sake of room/bass correction. Do you own or plan on buying a speaker like this, or have you heard any using it?