You should use different cables. I don't think combining the high and low at the speaker end will sound right. It might be a good idea to call MIT and see if they have a solution for you.
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What you want to do would be fine.I did that when I went from a bi-wire to a single post speaker."
Its not that simple. Under normal circumstances, you're correct. His MIT cables have a network box. Out of the box comes a connection for the highs and lows. Its not just a double biwire. What comes out of the highs on the network box is different than what comes out of the lows. If he doubles up, it probably won't sound right.