I have setup my new refurb Denon 1712 with Pioneer SP-FS52 fronts and Pioneer SP-C22 Center channel speaker. For the time being I'll have to use the old Polks that are still mounted on the wall for rears till I can upgrade them to the Pioneer SP-BS22 rear. I'm going to do the Audyssey setup and need to know where to set the crossover on a 20 year old NHT MA-1A/SW2P Powered Subwooferr. My choices are 50Hz 80Hz 110Hz or BY. I have attached the specs of the front Pioneer SP-FS52 speakers below. Any suggestions?