2 speakers, near a wall (i don't think you have an anechoic room), 64 watts (something any receiver can do), 13.1 feet, 99db.
99db not enough? oh btw, i HAVE these speakers in a 4k cubic room with only 1 concrete wall (living room with glass and wooden dividers connecting to the stairway, dining, etc). they are WAY loud before they break up, and that's based on actual experience instead of feeling. oh and LOL on your obsession to SPL.
oh and if you wonder why i'm on your case, i just got tired of your "this should be better because the interwebs thinks it's better" without even hearing ANY of the products in question, you could have gotten away with that with subs (not that that would have been accurate) ... but speakers?
i've NEVER concluded a speaker is better than another without hearing both in my home.
i also have custom made subwoofer and speaker switchers (though i didn't add gain control on the speaker switcher due to KISS) but switching from the SCS ('measly 84db') STS (90db) you'd think EVERYBODY would like the STS due to it's "louder" presentation. but i'd say more than half liked the SCS and others liked the STS due to more details. imagine that, listening to speakers to decide which they liked? what a weird world.