What are your opinions of DSP's for speakers

I haven't read all the posts here but will add my two cents FWIW.

I spent a good 2.5 hours of serious seat-time A/B auditioning a pair of GoldenEar Triton 2+ and a pair of Martin Logan Motion 60xti speakers, using a Simaudio Moon Neo 340 IX, a Marantz CD player and some CDs I brought for this audition.  I was told the Tritons had about 20 hours break-in time on them and the ML around 30 or 40.  Both of these speakers performed spectacularly, as far as my (and my friend's) ears were concerned.  My friend and I, both, loved both of these speakers, a lot!  However, in the end we both gave the ever so slight nod to the ML.  Although I loved the GE and would have been plenty happy with them in the right room, their sound signature was something I still can't quite put my finger on or describe any better than this:  it was like they did everything super right, reproduced every instrument's sound correctly and faithfully but somehow didn't mix all of that up into one cohesive or mixed musical reproduction.  I'm sure there's a word or term for that in the audiophile's lexicon but damn if I know what it is.  I kept telling my friend they lacked "fill".  That's the term I used for not being able to put everything together.  Remember!  I'm still splitting hairs here!  Don't know if the built-in Class D subs had anything to do with this or maybe lack of break-in, component matching issues, etc. but they were just lacking "fill".  The other thing I was and am wary about when it comes to powered speakers like this is the fact that they need to be plugged into an electrical outlet and probably individual outlets of their own.  Maybe that doesn't matter but the last thing I need is more wires & cables behind my rack or more circuit breakers, power conditioners, etc.!

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. 

Incredible strides have been made and the trajectory continues.

Subwoofer Optimization aside, if one's system has been seriously assembled with speakers optimally positioned for the playback of a substantial collection of pre digitally mastered vinyl the difference in analog and current digital processed playback can be quit noticeable for some.

Considering the user's age in this scenario, the 2008 Universal Studios fire and the undeniable convinces and enjoyment of streaming the gap must be narrowing by the minute.

In this hobby if you've never heard it done you won't be missing a thing. A testament to the 2024 San Francisco Museum Of Modern Art 'The Art of Noise' that analog playback's trajectory continues.  

Ah yes people allergic to DSP who expect bass integration in room to be a magical thing to do... Y’all are not ready to send your already good system to the next level. Don’t conflate terrible DSP implementation (which from the comments seem to be the case with the lot of you) with actually integrated and well used DSP. So yeah DSP is actually what to do when you have the speaker/room/treatment coupling achieved. Anyone who says otherwise, I say, skill issue.

@m-db ....for better or worse, the former in my realm, been DSP since '80's.
It's allow me to tame rooms that audio may have had no business in...
I've thought over a DBA arrangement that I've inherited a sub-eq that 'onceupona' was mated partially to my amts'..... 😎👍

'If you can't shatter the wineglass with the tweets, knock it off with the subs."
Our retirement homes Will be Different..... ;)