Hello axiom_fan

Welcome to the forum,

Do not use the impedance selector switch because it will drop the voltage to the power sections which can limit the dynamics (less headroom) and overall fidelity. It is best to leave the switch always set to 8 ohms.

The reason manufacturers implement those switches is mainly due to UL approvals.

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne