Thanks for the responses everybody. The sub just needs to pass muster when it comes to the Dolby certification process. There is a spreadsheet that they send you that has a bunch of prebuilt lists in it, containing dozens of pieces of gear (see attached). There are lots of active subs listed as well, but so many just don't have the power to make the spreadsheet in the green (any colored cells indicate something that is under powered and needs to be addressed). At the moment, our surrounds are also a little bit under, which we might be able to solve by bass managing them with an additional sub, which gets us another 3-4db, which will put us in the green.
Quite the process!
