I agree. ADM9Ts have not got "too little bass" for their size. For me personally a sub is a must. I listen to a lot of electronica and I *need* to go down to around 30 Hz to get the full effect. But that's the same with any similar sized speaker. Yes, some will cheat and create noise below 50 Hz, but then it isn't particularly accurate. My sub (non Avi, BK XLSS400 in fact) fills in nicely.
Point being I would need the sub with *any* small speakers, but with the ADMs I am getting proper, more accurate bass, because they don't try and fake it.
There's only so many things a 6.5" cone can do well, and 20-50Hz isn't one of them, so best to keep it tight and let that job be done by a specialist, in my case a 12" sub.