The Klipsch R-112SW is the right model of Klipsch to get. Avoid the R-12SW!
How much are you paying for it? It should be nicely discounted since it has been replaced by a newer model!
At the current $400 sale price (or less if you have found better).
However, I am worried that it does not look like you have a way to tune your subwoofer to your room! That is a concern! The Klipsch does not have much in the way of controls!
If you can buy it with a satisfaction return option, then go for it! Otherwise, I would try the RSL Speedwoofer at $400 - it has a good roll-off for keeping typical room gain from getting out of hand and RSL offers a great risk-free trial period to make sure they will work for you. Understand that this is not the strongest sub for deep HT gut-turning bass. It will do fine for most (non-bass heavy) music genres - in other words, it has plenty of bass for something like a standard bass guitar, but if you are looking for a club sound with very low frequency bass (or are a fan of pipe organ using the lowest notes on the biggest pipe organs) it will fall short.
rslspeakers.com
IME, heavy and very low bass capability is dangerous if you do not intend to spend some time , effort, and money (for gear that can be tuned) to make sure it works well in your room!
Here is a comparison/review of subwoofers in your price range. I am just being straight with you that most members here consider about $600 the starting price of a competent subwoofer, The review refers to these $400-$500 priced subs as high performance because the readers of wirecutter magazine are not generally audiophiles. However, Brent Butterworth, who was the lead person on this review is well respected in our community as someone who knows subs and he believes in measuring their performance and doing blind testing for subjective opinions.
For powerful, precise bass in stereo and home theater systems, the best subwoofer is the compact, affordable Rogersound Labs Speedwoofer 10S MKII.
thewirecutter.com
The compact RSL Speedwoofer 10S subwoofer, available for only $399 with free shipping and a risk-free trial, offers best-in-class performance and advanced features like built-in wireless connection.
www.audioholics.com