I drive a pair of Thiel 2.4s (Impedance: 4 ohms nominal, 3 ohms minimum. Sensitivity: 87dB/2.83V/m. Recommended power: 100400W) with that amp, and even though I got a lot of shit for doing so, it sounded quite a bit better than a Pass Labs X250.5 and a McIntosh MC-402 (the loser in the competition, by far). According to Stereophile's measurements (see the link below), the 30.5 provides 195 watts into 4 ohms before clipping. I do think the XA series is a little light on bass though. I've read that over and over, with people endlessly upgrading up the line to try and address the issue. In my opinion, it's just the weakness of the XA series. I got slightly better bass with the X250.5 (500 watts into 4 ohms), but everything else was quite a bit better through the XA30.5 (soundstaging, imaging, vocals, timbre). It wasn't a hard decision to figure out what to keep.
http://www.stereophile.com/content/pass-labs-xa305-power-amplifier-measurements
