I have the Stage 4's with the 15" drivers, and it's hard to imagine anyone needing more bass in a home situation, unless you're really into pipe organs or something, and it's totally independent of room damping. My teenagers all agree- and this is with 2A3's. If I were you I'd get them, as the 18" woofer in a 2-way is not going to give you as good mids, which is important with a 300B. Then, if they don't give you enough bass, ask Wayne for some plans to build a subwoofer out of the 18s or another 15 (or pair of 15s!!) and augment the bottom. Lots of other options, though....