This isn't so much a suggestion as it is a possible actual product. Seriously: this article says that the H-PAS technology in Atlantic's AT-1 tower speaker has been applied to a soundbar design that can hit 47Hz, and there are three companies planning to bring this H-PAS soundbar to market. One of those three is Outlaw.

I don't see this being something I'd use, but I can see this being something that could be kind of cool for my parents. I'll be interested to see what additional details develop.