Welcome to the forum Sam.
It is impossible to know exactly how much the 10 ft distance affected the spl in their measurements, but the 2 watts @ 4 ohms is = to 1 watt @ 8 ohms (2.83v).
Somewhere in the low 90s would be my guess at 1w/1m.
The ADS is spec'ed at 6 ohms nominal and 94dB = @92.5 1w/1m
Many companies show spl as 2 speakers in a room (=higher number) and a few measure 1 without room reinforcement (=lower number).
I like this spl calculator since it reflects my experience of levels in the typical small rooms in a house vs. a large performance venue that some pro audio calculators are aimed at.
https://myhometheater.homestead.com/splcalculator.htmlTrying a combination is the only sure way to know if low power will work for each individual since we all listen to different music, in different rooms, and at different levels.
I'm completely satisfied with a 4 watt EL84 sep amplifier and 90 dB Fostex speakers in a 12' x 14' spare bedroom.