That does seem high to me unless the QS8's are not near a wall then you loose the boundary effect and they could very well be only playing down to ~120hz. I would rerun Audyssey and make sure the house is very quiet when doing it, I ran mine at 3AM some times.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70