+1 on multiple subs if your space can accommodate them. Since rooms can have so much of an impact on low frequencies, I'd look into sub options that have DSP that can correct for the room. This also gives you more placement options for your sub(s).
Haven't been in the market for a sub since these DSP designs hit the market, so I can't make any specific recommendations for particular manufacturers or models.
Haven't been in the market for a sub since these DSP designs hit the market, so I can't make any specific recommendations for particular manufacturers or models.