Pass XA 30.5 with Revel F 208 ?

You might want to consider Focal they are very good with the pass xa series of amps and are 90db + efficiency with 4 to 8 ohm nominal impedance depending on model.

Hi Tls49,
I understand your point and priorities. I don't desire or seek those high peak levels, and I've heard systems capable of reaching 105-110db levels. That doesn't impress me and isn't an important personal criteria. But of course that's just me and I'm in no way critical of your preferences. We all aspire to achieve the sound/audio systems that fulfill our particular goals. I wish you the best in your sonic endeavors. I'm a confirmed fan of Almarg's many quality contributions.
Charles,

I wish you the best in your sonic endeavors.

Charles1dad, thanks, and the same to you. Sorry for getting on the soapbox, but when I read this statement in Almarg's post,

For instance, I have many classical recordings on labels such as Telarc, Sheffield, Reference Recordings, etc. that at my listening position reach peaks that I've measured at around 105 db, although the average level during those recordings is perhaps in the low 70's.

it just fueled my fire.

No doubt everyone's goals and desires are different, however when matching amp to speaker, IMHO, too many people make choices that result in being underpowered.

BTW, your system, extremely nice, and such an appropriate name, I can only imagine.

Tls49,
I appreciate your kind comments very much.
Charles,

Triumph Extreme II are small monitors with lower freq at 45 Hz. The room size is not small being 13 x 19 ft. Triumph Extreme II cannot do justice to high quality of Pass XA30.5 amp.