Here's my list (speakers I've owned are noted)
Original Large Advents (designed by Henry Kloss), my first pair of speakers after graduating from UC Davis
Dahlquist DQ10s
Quad ESL-63
Dynaudio Confidence C1
TAD CR-1 (designed by Andrew Jones)
Harbeth 30.2 40th Anniversary (my speakers from 2018 until recently; higher engineering spec than 30.2 XD)
Platimon Acoustics Virtual Coaxial
GR-Research X-LS Encore (built these up as a kit)
Buchardt S400II (my current speakers, love 'em!)
Something really important I learned from speaker designer Danny Ritchie in building up my GR-Research X-LS Encores as a kit was the importance of using quality parts and materials for the crossover components and internal wiring. I'll never buy speakers that utilize cheap-*ss sandcast resistors, crap capacitors, and iron-core inductors or internal wiring with PVC insulation again. The other factor I learned from Danny was the importance of using proper damping materials in the speaker cabinet.
Here's a pic of the crossover I built for my X-LS Encores as I was building them up as a kit. All large-gauge high-purity copper air-core inductors, quality Mills resistors, and very high-quality caps including Sonicaps and Miflex caps.
My Buchardt S400IIs also use crossover parts with the same level of engineering specification and quality as my Encores, which was a key reason I bought them. In fact, Danny Ritchie did some consulting work for Mads Buchardt when he was designing the S400II's crossover. As an example, you can also also see a Miflex cap on the crossover board. All the other crossover part are high-quality resistors, Sonicaps and Jensen Clarity Caps, and Mads also used high-quality silver wiring internally and Argento binding posts, same as Constellation uses. Yeah, baby!
No cheap-*ss parts here.
