I have Vandy 3A Sigs powered by McIntosh C42 & Mc501 monoblocs.Use the 4ohm taps on top,with 2 ohms to the bottom in combination with two stereo runs of Kimber 8VS speaker cable.I'm very pleased with the overall results.In my situation I find the choice of interconnects to be a huge determining factor in obtaining the preferred system sound.Currently using Signal Cable silver,but still looking for that synergistic match.Any suggestions from Mac owners are welcome.I contacted The Cable Company for their suggestions.They're all over the place with their recommendations.Now they say PAD Genesis(their only choice).Other times it's been Mit,Cardas,Alpha Core.Not sure what to make of these guys.