Yes the P3 would play well into your room and of a quality that responds to quality amplification. Regarding sensitivity I believe they are much like my Esoteric MGs which are ~87db sensitive and 6 ohm nominal impedance with a min slightly below 4 ohms. My room is 12' by 15' with 8.5' height and well treated with absorption. I drove the MG10s with a BEL 50wpc amp that was 2 ohm stable to very high levels.
There are many fans of the P3, hopefully they will chime in as to what they use for amplification.
There are many fans of the P3, hopefully they will chime in as to what they use for amplification.