Djk: I have a Cronus at 55WPC and found that the 4 Ohm setting sounded better with my Vandersteen 2Ces, which are above 4 Ohms nominally but still have a minimum impedance dip to 4 Ohms. The bass is better and there is a better dynamic punch. Do you know what the minimum impedance is for your speakers? If it is less than 4 Ohms and it probably is, then I would go with those taps.