You might want to look at the Quicksilver review in March, 2001 Stereophile, for the designer's comments on just this question. In "Manufacturer's Comments" in that issue, he also goes over the pros and cons of passive and active preamps. A balanced discussion, but I disagree with him, from personal experience, about having to have a high input impedance in your power amp(s) and also about having to use positively short interconnects. I've used a 10K ohm passive very successfully with Pass Aleph 3's used as monoblocks, input impedance 23K ohms (no higher), and the interconnects I used were 8' long, and unbalanced for LP play.
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