Thanks for the response Boy_lah. I have actually ordered the unit from Chris of BPT and have been using it for almost 1 month now. Mine only has one Oyaide R-1 duplex and the Bybee. I find the unit to be good in removing background noise and a slight hardness in the upper registers.
Do you have the Bybee Quantum purifiers as the upgrade option in your BPT PPC? Also, did you replace all stock Hubbell duplexes of the PPC to the Oyaide?
