I auditioned Q950 at ProFx. It had a solid bass punch, everything in the room was shaking including my whole body. That was the with the track Hey Now.
I listened to Polk L600 right after that, they too had good punch but a bit restrained, felt more warmer and in better control.
I didn't know Floorstanders could produce bass with such intensity until I listened to Q950 and L600 pairs.
But I would look at a good sub if bass is my priority. Most budget speakers can't produce chest thumping bass. Even ProFx was driving the speakers with some high end Denon amp. I am pretty sure Q950s won't be able to produce good bass with typical budget amps below a lakh.