I need to get to know this friend of yours. Honestly? You have zero risk here. You have 100% upside. If you have any sort of musically aware clientele the fact that you have a set of La Scalas in a coffee shop is like... awesome. My suggestion? Deploy as they are and let your clients fight over what you're doing wrong. Because they will. And then all sorts of ancient crusty sound gear will crawl out of the woodwork. They've got 15s. The sub you would want to augment 15" mids would push you into dumb territory. I mean, you still wanna be able to talk over the things, right?
His basement is ridiculous. Filled to the brim with family shit, hardly any room to move around and he's trying to hide all these fucking speakers from his wife who thinks he just bought one pair. Those things aren't tiny. If you even vaguely know his wife than you know that she is deathly afraid of rodents. If you mention the words basement or ally, she brings up mice and rats. Jeff told her that he thinks they have mice to keep her from poking around down there. Now he's paying for a monthly exterminator service to kill all these "mice". It's some sitcom shit. There were some other cone speakers sitting around half dismantled that he thought were pretty hot shit but I can't remember what they were.