Have you looked into guitar cabinets at all? Obviously not your typical Marshall or anything like that would work, but I've got a JBL MR812 guitar cabinet that is about as fullrange as I've ever heard from a guitar box. The bottom end isn't like an Accugroove, but it works great down to low G at very decent volumes. They handle 300 watts, 1x12, about 40 pounds or so. Sounds much brighter than my other cabinets with their tweeters off.