will
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Good advice here, so not much to add except in case you opt for longer term flexibility in room size and speaker choices.
My room is bigger, and speakers less efficient, but in my setup, a Taboo, and even an earlier SE34 (that later evolved into a "Rachael"), with 92.5 dB HR-1 speakers (and even with 94 dB MG944s) were too low power across all recordings for me....at least for what I think of as immersion level serious listening. Rather than getting more efficient speakers, I went for a Torii.
So in my main setup, I drive HR1s with a Torii MKIV which is rated at about 25 watts with stock tubes. But mine is less, using less powerful tube choices in several places. Also liking a ZBIT (bringing my DAC up to 6 volts max) before a CSP3, then into the Torii, I can run into minor distortion at a little lower volume than using only one of these pre stages. So I don't know the ultimate Torii power the ways I use it. But in my space, for serious listening-seat immersion, I run pretty close to max distortion free volume with my system and room.
The room is hard for me to calculate accurately since there are numerous segues with partial walls, but roughly averaging, ±30' x ±18' x ±9. Most times I listen much quieter, but my late night immersion sessions are really important to my musical pleasure. For this, my loudest listening, dB averages (iPhone app) are from the high 70s into low 80s, with peaks into the mid/high eighties, and more rarely near or above 90. At these levels, if not a little careful, I can get minor drops into distortion on extra hard notes while doing serious listening. So in this larger room with 92.5 speakers, I am near the edge headroom wise.
Anyway, my thought is that "enough power" depends on lots of things, and this is the way it worked out for me.
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