Hi jackmlin,
Welcome. That's an enormous room--just under 20,000 cu. ft. You're going to absolutely require a big subwoofer. I'd suggest at the least, the Axiom EP500 or EP600, and preferably a pair of M80s. I assure you the deep bass from a pair of M80s, properly powered, with at least one EP500 subwoofer will not be "lost" or overwhelmed by the big space.
You're also underpowered; consider an outboard power amplifier with at least a clean 200 watts per channel.
As others have suggested, some simple room treatments will help a lot--by "treatments", some area rugs and perhaps some wall hangings.
Regards,
Alan
