Wayne Parham Messages: 18786 Registered: January 2001
Illuminati (33rd Degree)
It's really just a guess without measurements. But it does sound like they intended to run the subwoofer up pretty high to match their mains. So it might just work as a flanking sub.
One thing you can do without measurements is to run the sub by itself and listen. If it sounds like you can hear muffled vocals, then there is some energy in the region we blend with mains to reduce SBIR and higher modes. That's the purpose of flanking subs. So if you hear that, they may just work for you!