I have a pair of the 5.5's on the way. I am hoping someone could provide me with some manufacturer's spex, so I can attempt to calc an optimal alignment for them. Nothing against the PAWO, I would like to start with a BIB for > line gain, > bass resp.Fs/Qts/Vas/Qms would be great. Stated SPL I would be curious to know about. Ikhalesh mentions using a 2A3, others, PPEL84, sounds fairly easy to drive at low levels, but likes some power. Thanks in advance.