I haven't got to hear Henk's Grands but I did hear his Full Ranges + 2xVelodyne DD18 subs. He was using the STAX and Plinius amps at that time but no Phasure DAC, which my sources say is very good but I haven't heard it yet. As a life-long planar lover and owner (started with Audiostatic, then Infinity IRS Beta, Apogees, STAX (not the headphones) and finally 3 pairs of Acoustats) with lots of Apogee owners as friends I have to say that I was NOT blown away by Henk's set up at that time. IMO, it was far to analytical and "synthetic" sounding...quite thin and aggressive to be honest. I heard much better set ups in Holland with original and rebuilt Scintillas driven by some of the few amps that can drive that speaker that actuallly sound good (Classe DR3 VHCs and Sphinx Project 16 hybrid).
Henk's new set up might sound very different than the one I heard but a source in Holland I know and trust (this man great ears) says that it still sounds quite analytical to him. However, if you loved it I can for sure understand why. The imaging and soundstaging of a Grand are probably the most realistic that you can get, with perhaps the exception of a huge pair of Soundlab elelctrostats.
I have heard an Apogee Grand in Germany sound awesome...but with all tubes in the chain except for the active Apogee crossover and the built-in Krell subwoofer amps. That system was bad ass with all NAT amplification in the chain (two complete different sets of gear too...one was all older 211 based SETs and the Utopia preamp and the new configuration is 4 x NAT Transmitters with a NAT Symmetrical preamp (krell amps now on tweeters and subs).
I myself went over to horns after hearing Odeon horn speakers. They also fit better my living situation than the 8 foot tall (2.4 meters) Acoustats that were my previous favorites. For ultimate transparency I have to give the nod to the planars (especially the Acoustats, STAX and Audiostatics...all of which are more transparent and "alive"at low volume than Apogees) but the horns do dynamic like nobodies business and they are quite uncolored.
I have heard now the LM version again with both the LM219 and a 300B amp from AcousticPlan at the AcousticPlan listening room in Germany...still really good stuff but it doesn't image and soundstage as well as my Odeons and especially not as good as good planars, is a bit more colored but makes big, meaty, palpable and dynamic as hell sound. Not sure I could live with the limitations but I could try

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I was a reviewer actively about 10 years ago and there are several reviews on Positive Feedback (one on the Apogee Caliper Signature, one on the Piega C2 ltd, one on the KR Audio Kronzilla DM monos, one on AcousticPlan Santor and Sarod amp and preamp, a series of reviews on preamps where I started pretty cheap and ended up with the likes of the Vacuumstate RTP-3D and Kondo KSL-M7). I am particularly proud of the KR review and the preamp reviews.
I can understand why you were blown away by Apogees...nearly everyone is the first time they hear them...I was and still find them superior to most else what's out there...at least non-horn. My first electrostatic experience was like Holy ****! There is a very good reason that throught the 80s and 90s a lot of reviewers were using Apogees...they show gear differences effortlessly and this makes reviewing a treat and altogether easier to do.
I will be at the show all four days and I will be at this BMW Welt thing so we should catch up.