-6dB and -10dB are throw away specs imo. The only one that is really telling is the -3dB. If the -3dB spec is accurate, then the speaker does not do deep bass. You will need to add a subwoofer if you want to capture the spatial information that reveals much more of the hall, acoustics of the space.
No problem; there are many subs available to do so, including some from Revel.
No problem; there are many subs available to do so, including some from Revel.