Phil is right, S10 is vented. I misread the description. Still, realistically low/mid 30s is what I'd expect out of it. It's a decent sub, if your speakers only play down to 80hz, but in your case, like I've said, it probably best to wait till your budget improves.
p.s:
Hot stock tip: Micron (MU) is very cheap now at $47. In fact, I bought 3k worth of it today on limit order I've placed a few weeks ago. Robinhood gives you free stock trades.
If you buy 9 stocks of MU tomorrow, within 2 months you could have enough for decent sub
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
20-30% after next stock earnings. Don't get greedy if it reaches $60 - sell