What are your opinions of DSP's for speakers

What is DSP?

There's a lot more that goes into the use of DSP than room and bass correction.   They also serve to give designers better and more powerful tools for crossover design and phase correction. 

If you ask, do I use DSP for bass correction?  Yes, absolutely. Even better if you can do it before your DAC such as with Roon. 

I’m a bit mixed on this.  As a purist I don’t want any extra processing going on in my system and would prefer using room treatments to mitigate those issues.  But many years ago I got to hear a six-figure system in a dedicated and treated room using the TacT 2.0 preamp utilizing their room correction (now employed in Lyngdorf products) and the results were fairly astonishing.  The system sounded very good in bypass mode without room correction, but it was undeniable with correction the sound was significantly better across the board.  I heard something very similar at a TacT demo at a show several months later so this wasn’t just a one-off impression.  Kal Rubinson did a review of the same unit in Stereophile around the same time, and what he found in his treated room was pretty spot on with what I heard and summarized it well in the review when he said “And even though I have concerns about the absolute transparency of the TacT’s A/D performance, those were more than outweighed by the advantages of room correction.”  Those echo my experiences exactly, and here’s the review where his listening impressions  start on page 3 if you wanna skip all the setup hoopla.

https://www.stereophile.com/content/tact-audio-rcs-20-digital-equalizerpreamplifier-page-3

So initially as a purist I was very resistant to using any DSP in my 2-channel system, but knowing what it can potentially do I will definitely give it a shot at some point just to see because if/when it works it really works to the point where you don’t wanna listen without it.  So I’d say don’t knock it til you at least try it.  Just my experience FWIW. 

I am going to go against the grain here. I do have the Legacy Audio Focus XD's with the Wavelet II DSP. I use it as my preamp fed by my Terminator 15th DAC. I have a dedicated 14 x 18 x 6.5 room. (Low ceiling) with a massive amount of room treatment, dedicated AC lines, the whole ball of wax. The Boehmer room correction is simple to use and does a dramatic job, especially with bass control. You can turn the DSP on and off using the software either on a cell or laptop with the click of a mouse. The difference is not subtle! Maybe it's not the answer for everyone, but Bill from Legacy Audio is onto something in his design of Masters Collection Speaker line. Speaker plate amps are modular if they fail and can be replaced if that ever happens. The processor can be sent in for repairs like any other component. I am getting fantastic sound in my medium modest system. I also use a HD Plex LPS for the Wavelet and just ordered a Revelation Audio Labs ambilocal cable for it. So for me it works very well, for others maybe not.

@fthompson251 Thanks for your feedback. I just listened to the Legacy Focus SE with Wavelet II at AXPONA and it was impressive. I'm not really wanting to substitute my existing preamp and DAC for the wavelet though and that's another reason for my hesitation with the technology. I am interested in the SE version or possibly the XD version, but I need more information on them. Thanks for your opinion on this. I want to hear both sides.