Bass performance: if missing then even a nice soundstage won't matter as the system gets an instant disqualification from AfterLOS
Preserving the integrity of the upper bass is the hardest part for a system that delivers solid output down to the lower echelon of the range, crossover and slope all play a factor in this.
Since there are weightlifters and muscular cats in this thread the comparison that makes it easier to understand the concepts of agile, nimble, lightning-speed, super responsive, not clunky
BASS is presented below
Sloppy, slow, clunky, ding-dong
bass = weight lifters = look at Baron = arms at 30 degrees
agile, nimble, lightning-swift, reverse-on-a-dime, super-tight
bass = martial arts sportsmen
The latter can deliver 6 kicks quicker than the former can even get into motion with a punch. Any one of the kicks can take out the knee or neck or head in a snap.
That be the difference and super importance of nimble, tight
BASS
AfterLOS knows what he be yapping about = 3 hour brutal workout 2 times per week 


Nimble, agile tight bass versus sloppy, clunky weightlifter type bass