Also no matter which transformers coupled amp you choose do experiments with light loading the output transformers- so for example I use the 2 ohm tap on my RM-9 with Vandersteen Treo to great effect and keeps the amp in class A longer - the test is listening and light loading IF your levels can keep you out of clipping.
Roger M wrote extensively this and many related subjects- a search will reveal a lot of free wisdom- RIP Roger
Roger M wrote extensively this and many related subjects- a search will reveal a lot of free wisdom- RIP Roger