For a small bass assist with my Spacestation, I tried my old Logitech Z2200 sub and was very pleased, especially since it is half the size of my Behringer.
Yes, a home HIFI subwooder will work well. I had connected a cheap 10 inch HIFI subwoofer to my SS3. It sounds good but the sub is not guite road friendly. Today I picked up a nice Harke bass amp.
I don't know if you've visited the 162 page long thread on the SS3 at Musicplayers.com, but owners are doing some creative things with their SS3. I've got some good results by connecting my 20 pound Acoustic Image Corus also.