mcintosh amps any one can explain impedance taps

Always try to match the speakers impedance. This is a very nice feature from McIntosh. I had a 7270 for 18 years until I went to tubes. Good luck.

You may want to check your speaker specs and select the tap close to the minimal value of the speaker impedance curve. Impedance is generally spec'd at a nominal value but the impedance of all speakers varies with frequency. For example, I use the 4 ohm taps to drive nominally 8 ohm speakers that dip to a little over 3 ohms. .

my maggies are 4 omhs so the 2 omh tap is the best match right I see the meters on amp not going as high when useing the the 2 omh taps

FWIW, You've chosen the right tap when you get the sound you enjoy most. Since you have speakers with a nominal 4ohm impedence I'd start with the 4 ohm tap. If your speakers don't have a serious dip in their impedence in the bass you will probably get the best match off the 4 ohm tap. But, if the speaker does have a serious dip in the bass your sound may become enimic and may benefit from using the 2 ohm tap.

Anyway, its likely that there is not perfect fit in any evnt, so just choose what sounds best to you. You won't damage anything.

ok thanks the 2 ohm is the winner here there ribon drivers and i think they dip alot of the time