Hi,   the Sonist Concerto 2 sounds similar to the Concerto 3, same drivers and crossover.  The Concerto 3 goes deeper and has more slam.  They are both 95db eff and run here real well on the 5 watt Glow amp,  yet handle 100 watts class A solid state very well too.   The pair listed here looks to be a great buy.  The Sonist line , made in California, is a music lovers speaker of fine value.   The Concerto 2 is a large/heavy monitor that does have usable, enjoyable, clean ,tight bass output.