These new notifications are useful... just to finish things out, I ended up with the XA-30.5 (actually the integrated amp version) for my Thiel 2.4s. Also purchased and auditioned in the same room an X250.5 and a McIntosh MC402. The McIntosh fell far behind (despite being loved by a previous 2.4 owner). The 250.5 had a bit of upper range brightness. Its bass was very slightly better than the XA30.5, but the XA just sounded way more natural and was fine bass wise as well (and I listen to quite a bit of electronic & rap/R&B). Suppose if I were a basshead I wouldn't have ended up with the XA though, or the 2.4s for that matter.