Most coherent low volume speaker with very fast bass under 10k used?

Low volume listening isn't necessarily compatible with higher level listening as a design conundrum exists…Fletcher Munson et al...powered subs ("fast" bass is a term I find meaningless) can help if low level listening is what you want…you can turn the relative level up…who knew? Horns at low level better be pointed at your head, but I still think any speaker that somehow exceeds at boosting the frequencies that otherwise drop off at low levels can over boost those frequencies when you turn stuff up. Get an equalizer maybe as at low levels you don't get proper musicality anyway, so who cares if it adds crap? 

The "fast bass" thing may exist in certain theories or somewhat useless measurements (is metal "faster" than paper?…uh…no…) but is not relevant to the ACTUAL sound of good hifi…assuming "all speakers" have this "time smear" issue is silly, as is the claim that 85 DB is "far too loud." For what? Sleeping? Level is relative to the listener's comfort as few listen with their speakers stuck to their heads (except headphones, another topic), and luckily few believe the "fast woofer" theory as it applies to actual real time listening and can enjoy great sound without worrying about their "slow" woofers in either their main speakers or in subs…or swarms of subs found by many to be both musical and coherent (including in some more sophisticated live concert environments). Balderdash I say! Luckily nobody listens to theories (except the ones adopted by the people who designed the gear), but they may actually listen to music.