Hi Orthobiz,
Yes, I heard the sub, and it sounded just fine with the Biro's, but I am not that deep bass oriented, myself, and also consider myself unqualified to make much of a judgement. Mr. Van Alstine said his room wasn't quite finished yet, also. I did my auditioning with the straight Biro's, which in real world listening will effectively go down to and handle well, the low string on an electric bass guitar, something like 42hz. I don't do home theater and find that for me, the sub may not be necessary, although for others it may be a necessary part of their system. One thing I can say is that Mr. Van Alstine knows his stuff, as most people who know him will agree. Therefore, if you are in need of a sub, I would guess that his would fit the bill. He is a very personable guy and would be more than happy to give you all the why's and wherefore's if you choose to give him a call. Sorry I can't be of more help.
rickweed