Perhaps. Although I do know how loud a 12" guitar speaker is on 50W of tube power, and a 100W tube amp with 2 12" guitar speakers will fill up a 500 seat venue - easily - and even make the drummer mad. Apples and oranges, I know.
My previous system back in the 1990s had a 2 channel Zapco amp 50RMS per side, on 5.25" & 1" titanium JBL separates and 2 10" operating bridged off of the same amp for a 3 way passive, low wattage system. And that sounded great, though not an SPL demon, but louder and clearer than what I have now.
Sidebar: I find it interesting that guitar amps operate heavily, VERY heavily into clipping (like square wave distortion/overdrive), yet a 50W amp won't blow up a 50W speaker.
CHAD