I get very good bass out of my Revel Salon 2s. But when I want more, I use the parametric EQ function in JRiver to boost bass by a couple of dB at 100 and 500 Hz bands. Does the trick pretty well.
An additional non-software tweak that really helped bring the low-end oomph was putting the Revels on Star Sound Apprentice XL stands - but that involved hardware, so probably outside of your area of inquiry.