I couldn't find any mention of a subwoofer in the setup, just the Yamaha ysp 800. In case any one isn't familiar with that model, it's the one with a bunch of 1.5" speakers on front and two 4" woofers and it is a sound projector, I think that's what it is called. There are no actual surround speakers behind you, it simulates surround sound from the front speakers. Also, no dvd player is included, you have to bring your own.
I just called the Chicago-Ohare Hilton and they didn't know if there was a subwoofer, they said it's a brand new room and they'd have to check. They offered to call me back buy I declined. The rates are only ~$20 more than normal per night, but the room rates fluctuate quite a bit. I didn't think to ask about soundproofing. Being that it's an airport hotel, I'd think there is already a certain level of soundproofing in each room, probably outside soundproofing.
Jack