Once you experience (including hearing) the GR open baffle speakers you will never go back to closed box speakers. I'll be traveling there (be GONE Evil spirits 😁) next week to take care of a few things including my next pair of speaks!
Now that I would like to hear.
I've heard very high end (north of $60K) open baffle speakers both at the NY Audio show recently and more than twice at the home of Steve Rabbitz (Sound Insight and a dealer for GT Audioworks). Here is a (somewhat outdated and since upgraded) photo https://www.gtaudioworks.com/ . I'll keep my closed box speakers, but do remain open minded to hearing GR's if the opportunity presents itself.
Greg is a friend and we demoed together at CAF multiple times. Greg makes great sounding planar/ribbon speakers.
I ran the digital front end for his room with a HAL MS-5 Music Sever and Danville Signal dspMusik 2x8 configured as a stereo DAC. It had way more capability, but showed how well the DAC's in the system performed for music replay.
I have heard his planar/ribbon speakers for many hours and own 8 of his 20in true ribbons for my Megaliths line array project with 4 ribbons and 8 BG NEO10's per side. Flanked by a pair of 6x12 OB H-Frame servo subs. Worked pretty well but the open baffle frame was to unstable. Now have two line arrays with 6 Dragonfire Acoustics DFA-510 planars per side with the servo sub arrays with a new open baffle design.
Danny's Line Force speakers with 3x12 servo subs are excellent speakers when Scott and I heard the first pair after build in Danny's original room. That was a fun time listening to music!
What Scott heard at LSAF is the beginning product with the Radian LM10n planars. There are other ideas in work. Only time will tell. For all systems, the dspNexus 2x8 DSP crossover and HiRez DAC's will be the heart of the system. After my comparisons to other DSP processors, they all fall very short in sound quality. The day Scott was there, he actually heard a prototype of the full upgrade DAC system using the original AKM AK4499 DAC's. Those are no longer made after their foundry fire, but the single original chip been redesigned as a two IC system with digital filters and 32bit balanced R2R ladder DAC as separate silicon.
They are at the top of my very short list of the best sounding DAC's in products.
Rich