What are the r300s? I wonder what would happen if you played them in your HT on the fireworks scene, perhaps there's a big 150hz mode in your bedroom making for a dynamic, but colored experience. If it is a bass region thing then the dual 10s will certainly provide more, double in fact. Are you sitting closer in your bedroom than your HT? 15ft is a fairly long throw for speakers, but the Cinema 10 would have no issue. The Pure will do reference but it'll use everything it's got at 100hz to do it. Meaning 3 or 4mm of excursion while also reproducing up to 1500hz. So there might be a hint of modulation distortion and the woofer will be becoming less linear. If audessay or anything else is adding another 3 or 6db of boost anywhere around 100 to 150hz then the Fusion 10 is going to struggle a bit at reference. This could be the opposite of your bedroom. All of this is speculation, but would make sense given your comment about fireworks and dynamics. If that is the issue you need more woofage. Either an MBM or a bigger speaker. Not necessarily a more expensive speaker.