From: AA Small Speakers

[Fi Car Audio 64]

I had some PHY 21s and piezos for about 3 months (they were on loan). I had them in an open baffle set up and found them to be quite enjoyable. My first experience with them was about 7 years ago from Ocellias Tillia speakers. They were an incredible setup with rather interesting cabinets. The engineer had told me a lengthy story about violin makers and his passion for them and how he took that into his speaker/cabinet designs. I had expected them to be sonically inert like most high end cabinets... but they were about as thin and flimsy as you could possibly make them. But... this was the key to the sound and the resonances of the cabinet were tuned for the overall system.... hearing was believing.

I am FAR from a beleiver in audio BS and snake oil.