The odd frequency thing has cleared up. The duplex definitely offer greater clarity in the music playing on my system.I am thinking of replacing some of the wiring in the Furman going to 12 gauge MilSpec Teflon 600V wire. It would ease the tightness, remove a bunch of crimped on AC connectors at the duplex end.(Cutting the connectors off as is would leave the wiring to short to work. The wiring is that tightly fitted.) The wiring comes from the transformer to a long old fashioned connecting bar (with dividers and twin sets of screws) So aside from tedious untangling the harness from each duplex to the bar, looks straight forward.)The last group of Duplex has arrived. I have enough to cover every outlet throughout the system, including all in power conditioners.