Sub? Can't Decide

I use to own a Hsu and thought it was a very good sub for the money. Don't know anything about the other two.

There is a Linn Akurate 221 8" sub on A'gon right now for $995. The retail on this is $3750. I have one in my living room and it is a fantastic sub for both music and movies. It's perfect for a moderate size room -- not big enough for a big room. If you turn the gain low enough, it will fill out your low end in a very subtle way without bugging the neighbors. If you want to spend less, there are some open-box specials on small REL subs on vanns dot com for good prices.

Looking back, I sure wish my apartment-life neighbors had been half as considerate as Elizabeth is! That said, with your Mythos soundbar rolling off at 60 Hz, I think it's clear you should try a small sub.

Mateored is right. Get it dialed in with right placement and crossover freq, then set gain to just above audible. Most of the time it won't be apparent, but will add a base of compression that enhances everything else.

I have Hsu subs and they work with my system (and a great company to deal with), but I'm betting that you'll need something like the high-level crossover and Neutrik connectors, as well as other features found on the small REL's. For instance, you may end up raising sub's lower rolloff freq. due to your 10 x 10 room dimension. Strongly suggest you go for the REL 8" T2 from vanns, etc. per Mateored.