I quote WF:
"As the VP150 did correctly reproduce the signal supplied when it was connected to another speaker output, I concede the fact that I am probably looking at a receiver problem and not an issue with the speaker or speakers. "
You and he are having different problems.
Out of curiousity, have you played with the positioning? Alan did a column on the centers in the latest thing which I found to be very interesting. BTW, Tony, in his column, he did not say that it's inaudible. He said it was a matter of positioning. In any case, I haven't heard the thing or your setup, so I'm not getting into it other than quoting.
