It's interesting to read some on the technical side of this issue, but I have had similar situations with Klipsch speakers (impedance varies with frequency, from just below 4 ohm on the lows to 12ish on the highs). I wondered and asked this question years ago, and got an answer one a Mac related forum that either 4 or 8 was OK, whatever sounded best, but it was the 8 ohm taps that sounded "proper". "Balanced". The 4 ohm was bloated in comparison - this on properly operating MC30 and MC250. It seemed pretty obvious that the 4 ohm was definitely "off". in terms of sonics.
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