PYM1555 292-236 300W 95.8db $59.90
PYM1578 292-238 400W 97.5db $79.90
PYM15128 292-240 600W 96.6db $139.75

Assuming that the 800Hz Piezo can keep up with 97.5 db (1w/1m) efficiency, the PMY1578 looks like the deal (although the aluminum basket, 4" VC w/ Kapton former, 125oz magnet, and 600W power handling capacity of the PMY15128 looks good). Otherwise, the specs on the woofers look identical.

Any idea of how Pyles would work in a base-reflex home installation? I know there are people who swear by them. I think they would perform well using Wayne's alignment (early, shallow roll-off).

What kind of impedance load do you think a system like this would present? Could it be smoothed out enough for vacuum tubes or is this a transistor only system?

Dave