mcintosh amps any one can explain impedance taps

there 4 omh macrojack and like power

Almarg, your post is correct regarding tube amps, however Majic's amp is solid state. McIntosh uses autoformers on their top solid state amps, so it is a different ballgame.
I found out that experimenting is the best option with a Mac Mc402, for example, Gallo Nucleus 3.1 speakers (8 ohms spec) sound better connected to the 4 ohm tap.

Thanks for pointing that out, Casouza. I hadn't realized the amp was solid state when I made my post.

Regards,
-- Al

My Mac 501 SS mono's sound better on the 4 ohm tap with my Thiel 3.6 spkers that have a nominal imp of 4 ohms but dip to 2 ohms. The 2 ohm tap sounded very different, not nearly as good.