Pass XA30.5 enough power for Wilson Sophia 2?

Nickt...I suspect the XA30.5 will do fine driving the Sophia 2s. They are 88db sensitivity and 4ohm nominal rated speaker. The Sophia's do dip down to 3.26ohms at 220Hz but the phase angle is low at that frequency so that shouldn't be too hard to drive. Brian Damkroger of Stereophile reviewed the XA30.5s and drove Sophia 2s with them. The one thing he did point out is a slight lack of macro dynamics with this combo. So I don't think you will have a tough time driving the speakers but they will probably not get the last ounce of macro dynamics from the Sophia 2s, which are very dynamic speakers when properly powered. Here is the Stereophile review of the XA30.5: http://www.stereophile.com/solidpoweramps/pass_labs_xa305_power_amplifier/

My speakers are Focal Electra 1037BE. They are more efficient than Sophia at 93dB/W/m. I often turn up the music to +90dB in 15 x 20 room without any problem. The needle that indicates bias current rarely moves past 12 o'clock position.

Good one 61!

Ditto! Couldn't have said it better, 61!

I have a Pass Labs XA30.5 currently driving a pair of B&W 802Ds and it drives them OK. I could use a little more power but the 802Ds have a very steep impedance curve. However the midrange and highs are glorious and the bass is very deep and tight. It just not play as loud I would like at times. It can get a little loose on some passages. The Wilsons are much easier to drive than the 802Ds and the impedance curve is not near as steep. The XA 30.5 is the finest amp I have owned sonically speaking. I am barrowing the 802Ds until get my my Apogee Divas redone by Rich Murry at True Soundworks. I will be selling the XA30.5 and purchasing a set of Pass Labs XA100.5 monoblocks within the next month or two.