Hsu CCB-8...What Have I Done?

Great. So now 4 Hsu subs and you are set!

Great idea! Their subs are all so dang big, though! Maybe they will come out with a nice 12" sealed sub. I could handle at least two of those!
Also, I already have multiple pairs of stands to choose from:  28" Targets, 26" Sanus and 34" Sanus woods are all available.  I think I'll start with the 26" Steel Foundation Sanus stands.

Mr. Miller, I love subwoofers too. That makes us both sort of interlopers here in the speaker forum. The HSU CCB-s is a coaxial speaker .

Mr. McCall I have no actual in home experience with this speaker nor do I know what the HSU return policy is.

If you purchased two for stereo playback or plan to purchase five to seven for home theater its very wise that they're matching. In the HT setting the more equal their distance and height they are placed the less room correction will be needed and the surround effect will be much better for it.

I'd gamble on trusting HSU rating this speaker to provide a near 50Hz response. Maybe others here can provide their actual experience.

Congratulations on your Daughters new duplex. My first property was a duplex. As a home owner and a landlord you learn a great deal in a very short time. 

They have a 30 day return but customer pays shipping. Fair, I think.
I bought a pair. Stereo only. I will use a pair of subs, though. My Velo’s can’t cross over higher than 80 Hz and that is what Hsu recommends for them, so I should be OK there.
...and thanks!

"but they would appear to be rather sensitive to placement; especially toe-in."
@jdmccall, the opposite is true = correct.
From Hsu Specification:
"Frequency Response: 50 - 20 kHz +/- 2 dB, flattest at 15 degrees off
axis(designed for listening at 15 degrees off axis, speaker axes to cross
in front of listener)."
And Placement (manual):
"Toe in the CCB-8s The CCB-8s are designed to be toed in so you sit 15 degrees off axis. i.e., cross the axis of the coaxial drivers about a foot or two in front of you. This gives the most stable imaging and the widest sweet spot. The frequency response is also designed to be smoothest at 15 degrees off axis."

See the Review by Doug Blackburn (scroll down)!
"The CCB-8s also do something I don’t encounter very often. The center image remains centered when your listening position is well to the left or right of center. Last time I heard this effect, it came from a very expensive pair of German MBL Radialstrahler loudspeakers that featured three omni-directional drivers."

My Mains are designed in a similar fashion.
Now I have to try this for myself.

The Manual describes a sound recommendation for Placement with Seven feet from the rear wall.
The alternative is against the wall (as close as possible) with an absorber panel fitted behind the enclosure.