I just received an email from Jeff at Sherwood:
"The center will not be silent. It should offer reduced output below 60
Hz. Output should be down 12 dB at 30 Hz and 24 dB at 15 Hz."
I have my P-965 crossover set at 60
So I guess I am mistaken(?) but the center is the only channel I am hearing other than the sub during my calibration tests. I will turn off the sub and see what the output is from the center alone.