All the identification I remember was Infinity and 4000. They're a bookshelf model, not a tower, and the dearth of information on them (even on Infinity's site) is why I'm casting such a wide net asking for help.
No, I didn't buy them yet, though I'll likely take a chance tomorrow if they're still there. Fortunately, the shop that has them is in a strip mall whose anchor closed several years ago and hasn't yet been replaced. There's not a lot of traffic through there which is why I took a chance on missing them while I looked for data.
edit: thanks for the welcome. I've lurked here for a while, but this prompted me to post.