Tfk, as Raquel said above, I believe changing to 4 Ohms requires opening the chassis. I have a Power 1 and that's what the dealer told me the change involved. Is your Power 1 different? Does it have actual 4 and 8 Ohm taps on back?
fwiw--I haven't changed/rewired for 4 Ohms and am using on the standard (8 Ohm?) setting on nominal 4 Ohm speakers with no issues.
fwiw--I haven't changed/rewired for 4 Ohms and am using on the standard (8 Ohm?) setting on nominal 4 Ohm speakers with no issues.