The unbalanced input impedance of the MC402 is 10K ohms, so it will be necessary to use a preamp with an output impedance of less than 1K ohms, 500 would be even better. The Primaluna preamps are 2.5K ohms and 2.8K ohms, just way too high for the MC402. It would be wise to stay away from the Primaluna preamps.
Mac vs Primaluna
I recently upgraded from a Primaluna Dialog 2 integrated to a Mcintosh MC402. I am using an old Carver C1 Preamp so I want to upgrade the preamp. My choices are a Mac C220 or C2200 but also maybe a Primaluna Preamp. The reason i look at the Primaluna is the integrated i used worked great with my speakers. Great detail but a small soundstage. I wanted to increase the amplifier size to increase area around the speakers. I am not ruling out the primaluna preamps because i did love the sound. The speakers are Magnepan 1.7s by the way. Anyone out there that has tried between any of these please let me know your personal opinion.
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