Hi everyone, I've both the AR-3a and the AR-11 speakers, and there is indeed a difference in the bass. The AR-3a bass is deeper, smoother and go lower, whereas the AR-11 bass is lighter and more subtle I would say, as you can hear a more discernable difference between bass notes. Listening to the AR-11, I discovered some new aspects of the bass notes of my favorite records, that there a difference between "high bass notes" and "low bass notes". It's like if the bass is singing.
Sometimes I change my speakers from AR-3a to AR-11 (and vice versa), depending if I prefer to hear a deep and smooth bass or a "singing" bass.