Hi Justlisten Duntech may be able to give some advise when you mention the name of your amps. I have a Anthem amp1 that has 4,8, and 16ohm settings. My spkrs are Meadowlark Kestrals that are 8ohm. When I tried the 4ohm tap the spkrs didn't sound right at all. I also called Meadowlark and they told me the 8ohm tap would be the best. Also since you put new tubes in your probably won't have a clue untill the tubes settle down. Best of luck