MC2200 driving a pair of ML Aerius i speakers. 4 ohm tap gives better bass but I still prefer the 8 ohm tap for better (perceived) clarity. I am forced to use a 25' long cable (12 AWG) between the amp and the speakers so that probably explains the better bass from the 4 ohm tap since it has a 30 damping factor vs. 16 for the 8 ohm. I haven't tried the 2 ohm tap yet but I suspect the bass will be even better since the manual shows a damping factor of 50. The intriguing part is that the output impedance varies across the taps while the current delivery is supposedly constant due to the presence of the Autoformers.
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