Update: I replaced my two McIntosh MC2100 (220 watts mono) to a pair of brand new McIntosh MC601 monoblock (600 watts). First two hundred hours my 2CE Sig II was at 8 ohms tap then now, moved it to 4 ohms tap. I have not notice much difference yet except the volume level went a little lower.
I'll keep listening and see if I can hear any diff. by using the 4 ohm tap.
I'll keep listening and see if I can hear any diff. by using the 4 ohm tap.