Hansang, great point. It's definitely not the 600 making it sound more boomy or "chest-thumping," it's how the studio mixed the soundtrack to enhance the effect. The 350 should do much of the same.
Fred, I did try both subs running together. It was impressive, but to me, not $3400 impressive for my 2400 cubic foot room. I'll be keeping one of these subs and running it together with my older Earthquake sub to smooth out response to more spots in the room. The 600 and PB13 are more than capable volume- and frequency-wise to fill the room, but they are unfortunately limited by physics as to how consistent/smooth of a response they can provide to all seats of the rooms at once.
With two of the subs running, even though one (the Earthquake) is inferior to the primary sub, this seems to be vastly improved. This was confirmed just through quick testing by plugging in the second sub and experimenting with the phase switches. Final calibration and tweaking will undoubtedly take me another day up in the media room to figure out, so once I make a decision on the primary sub, I'll move on to that task. (possibly separated by a week or two so that my wife doesn't string me up for spending another Saturday locked in the media room)
