Johnb30,
I asked Kent at Pass about the XA100.5 versus the X350.5 driving a difficult load. He told me that in listening tests, the panel preferred the XA.5 and mentioned sonics but also its ability to control low frequencies and low impedances speakers. My speakers are a 4 ohm load and only 86dB efficient, so I switched from the XA100.5 to the XA160.5. With your speakers, you should have no trouble with either, IMO. I suggest you talk to Pass Labs and then demo a pair from RENO HIFI or a local dealer to be sure before you buy.
I asked Kent at Pass about the XA100.5 versus the X350.5 driving a difficult load. He told me that in listening tests, the panel preferred the XA.5 and mentioned sonics but also its ability to control low frequencies and low impedances speakers. My speakers are a 4 ohm load and only 86dB efficient, so I switched from the XA100.5 to the XA160.5. With your speakers, you should have no trouble with either, IMO. I suggest you talk to Pass Labs and then demo a pair from RENO HIFI or a local dealer to be sure before you buy.