I have been using Pearl Acoustics Sibelius speakers for the past year and a half. Room size, 20x20'x9' ceilings. System, Audio note Oto SE signature, TUBADOUR III SE Nonoversampling Tube DAC, Zestos Andros 1.2 phono preamp, VPI classic 3 with Koetsu Black cartridge. Using Morrow rsa cables and Silversmith Fidelium speaker cables. I would consider my system to be mid Highfi at around $15k not including speakers. I have been a big fan of Fritz's speakers Rev 7 SE and Carrera speakers for their authentic and natural sound. There are numerous reviews on his Bookshelf Speakers. I also had REL subwoofers to compensate for the 50Hz and below sounds. But I was tired of the space required for speakers and lack of seamless coherent sound stage. I did my research on a speaker that was authentic in design and neutral in sound, also no crossovers but still gave me a full range loudspeaker. I am extremely pleased with the sound, more impressed with the best customer service. Just Google or utube the reviews. Oh and I am happy to demonstrate the sound qualities if you are in the northern NJ area. These speakers can easily and realistically go down below 50 Hz.
Not sure I will be going back to multi drivers as there are just too many components and why do you think some audiophile purist still lean towards SET systems?? Because sometimes simplicity in design translates into listening to the music in the format it was recorded in. I hope this helps.
