Best bass response in under $1500 used towers

You may want to look at some used Legacy Audio Classics at that price point.

PSB Stratus Gold I
without any doubt. I have had Meadowlark Osprey's , Von Schweikert VR 2's, The Vandersteen 2ce sigs...I have the PSB's Gold I's now and they are most impressive.

NHT 3.3's are another option or NHT 2.9, Biamp with NHT SA-3 amp! amazing full range for the right price.

I'll second the NHT 3.3's. Killer bass, but does require some significant muscle to drive it cleanly.

Marco

I haven't found good bass in this price range. I'll try some of the suggested speakers. I've auditioned the Paradigms twice but wasn't blown away by the bass. Maybe room issues. I settled for a small sub with crossover set to about 50Hz. Really adds another dimension to small floor standers.