I heard the B 300 at a audio get together ,at first listen and looks I guessed they were around $12k they sounded very natural and smooth not in your face , details were very fleshed out , mid bass and low bass Great by any standards.
for sure low 20s in the 20x16 room we were in . Having modded loudspeaker Xovers for years I wrote to the designer Joshua and inquired about a Sae model
to put it into the next level we went over parts quality , with even upgraded WBT connectors with massive Xover upgrades for just over $1k more , that will be a exceptional speaker ,I am thinking on now buying.