Did some digging; this out of an owners manual for the VAC renaissance 30/30-
"A word about impedance matching - If you bi-wire your system (run separate speaker leads from the amplifier to the high and low frequency transducers)you may discover that two different taps work best. For example, with early production Martin Logan Sequel II we find that the bass speaker is best matched with the 4 ohm tap, while the electrostatic panel is best controlled by the 2 ohm tap. On later production Sequels we use the 4 ohm connection to both drivers."
I'd recommend contacting the amp / speaker manufacturers before getting creative just to be on the safe side. Good luck
