This thread is a fun read, even if I can't comment on the B&W 80s D3s. They're well beyond my price range.
If the story is correct, the Phil tower line, of which the Phil 3 was the last iteration of, was his way of creating an affordable version of the Salk SS 8: a $9000/pr speaker.
Several here have said that at the time, the SS 8 was the best speaker they had ever heard.
In 2011, Dennis launched Philharmonic Audio by showing his Phil 1, 2, and 3 designs at the 2011 Capitol Audio Fest in July. He shared a large room with Jim Salk. In my photo below, you can see the Phil 3 (blond maple) in front, with the Phil 1 (black) next to the different looking Salk Sound Scape 10. All were Dennis's design, and they shared overall sound qualities. The Salk Sound Scape 8 did not exist yet.
All the speakers there that day were driven by the same electronics supplied by Frank Van Alstine. I cannot remember the model of the pre-amp, but the amp was his 225 wpc solid state design (
similar to the Vision SET 400), that sold for ~$2000. It easily drove any pair of those speakers in that large ~25×25 foot hotel room, meant for small conferences.
All three Phil models had the same BG planar midrange driver in similar looking cabinets. If I remember correctly, the Phil 1 had a SB Acoustics 8" woofer, the BG planar midrange, and a Fountek ribbon tweeter. It was the low-priced version. The Phil 2 (mid-priced) replaced the tweeter with the RAAL ribbon, and the Phil 3 (the statement version) replaced the SB Acoustics woofer with the 8" ScanSpeak Revelator. The Phil 1 & 2's bass module was somewhat smaller, and the Phil 3's bass module was larger as required by its ScanSpeak woofer. All three bass modules were folded MLTL design cabinets.
Dennis worked quite hard at designing them, especially the two less expensive versions, which came only in black painted cabinets. The Phil 3 allowed purchasers to specify different veneer finishes. After their introduction in 2011, Dennis found that the Phil 3 out-sold the Phil 1 & 2. As a result, when all those black Phil 1 & 2 cabinets from his initial order were sold, he dropped those models.