The IRS line was um, problematic. The crossovers were designed empirically through trial and error, amplifiers be damned. Here's the measurements from Stereophile:
https://www.stereophile.com/content/infinity-irs-beta-loudspeaker-measurements
It's not so much the power as the wavering impedance curve with a low of 1 Ohm, far lower than most tube amps recommend, and the wavering interacts poorly with tube amps, in the sense you won't hear a flat response anymore.
I might suggest you see if anyone has produced a better crossover for these speakers. If so, I bet they fixed the impedance issues. Otherwise, stick to beefy SS.
https://www.stereophile.com/content/infinity-irs-beta-loudspeaker-measurements
It's not so much the power as the wavering impedance curve with a low of 1 Ohm, far lower than most tube amps recommend, and the wavering interacts poorly with tube amps, in the sense you won't hear a flat response anymore.
I might suggest you see if anyone has produced a better crossover for these speakers. If so, I bet they fixed the impedance issues. Otherwise, stick to beefy SS.