You might want to swap back once you've lived with the amp for a while. I have always found that the choice is very important for sonic reasons, and the right choice is not possible to predict based on the stated impedance of the speaker - even for the same amplifier.
Before you buy another component, make sure you know how each tap sounds. You might have a free upgrade hiding under the amp's cover :)
Before you buy another component, make sure you know how each tap sounds. You might have a free upgrade hiding under the amp's cover :)