If one were to add a subwoofer to this machine, is there anything that's not super heavy? Stage subwoofers typically weigh 75lbs and more.

For many years, I've been using 2 FBT Maxx 2A's. When they came out, they were the best 10" live speaker around. I very rarely get volume complaints, and I never get complaints about sound quality or clarity. But this Spacestation looks neat.