Alesis has been around for a long, long time -- their most famous products in the pro-audio department are their digital multi-track tape systems, but they also dabble in amplifiers and speakers. I'm not surprised to see this "cross-branded" product from Alesis. They've done similiar technology exchanges with other companies, and the product is most likely a "co-developed" system with Logitech. If I had my guess, I'd say that Logitech designed the subwoofer and satellites, and Alesis manufactured the Dolby Digital decoder and amplifier. It's just my guess, of course!
Greg