Please take these comments with respect to what we know about room coloring, audio memory, and my personal bias that undoubtably play into my feelings. Lets see if I can offer a fair assessment of these.
First the bad. These are not the most perfectly flat, tonally balanced speakers I've heard. You can see this in the on axis frequency response. There's a few wiggles. Honestly, I could have worked them flat but at the expense of XO complexity that I felt wasn't worth it.
But the good subjective BS that I have a hard time explaining. The midrange is flawlessly clear. You know when people say " I'm hearing things I didn't before". Well that usually a lie. Or they just haven't heard anything decent. These on the other hand did that to me. Not often. That would be a lie. But it did happen. Also with vocals I could actually understand the lyrics. I've never been one to understand lyrics well. Remember when tapes came with the lyrics written in the cover flap. I'd have to read those to understand anything. As a guitar player I always listen to the instruments. But with this speaker, the lyrics just naturally found their way to my ears. So I heard a few things I hadn't and the things that used to be difficult to hear we're now clear.
The tonal balance was surprising flat. Wait a minute, didnt I state in the bad section that this speaker wasn't tonally balanced? Well its not the most tonally balanced, but considering the downward sloping FR, I would have expected it to sound overly full, tubby, thick, etc. but not so. The low end has so much output that the sound is so clean and clear that it fits well with the mid and treble.
Dynamics. Well, do I need to even say anything here. Insane. How about that.
To what I've compared. Hmm, well, everything you can find in a box store. Most of the kef line up. Some of the Focal stuff. Tannoy. Totem. Hmm, tons of DIY stuff, mine and others. Various monitors in studios. Different pro audio gear in various setting. And yes, it's the best I've ever heard. My wife has had a thousand speakers go through our living room. She likes the small ones. When this thing was built she laughed and said "when are you gonna be done with this one?". When she heard it she started trying to figure out how to fit a pair in our living room. I started to laugh at her. They're that good.
So is this the next speaker in my house if its so good. Eventually ya. It's the best I've ever done. Ill probably do the active version and only one woofer though, because my wall likley cant support two woofers. This thing genuinely surprised me. I expected a power house to appease all the psychos around here. Not something I'd actually build. The next closest thing was the Planar 2 speaker I just spent a couple months on. It's very sweet, but doesn't have the insane output and midrange this one does. But it's smaller. So...
I plan to build a TM version to match. Also a single woofer version. Erich and I have our work cut out for us on the SEOS 10. This was just a teaser to get the SEOS 10 pumped up for the preorder. I have 3 more speakers planned (smaller), and I'm sure other designs will arise from guys like Face2, MTG90, etc.