McIntosh MC 601 Using two taps at the same Time

Has anyone use two taps at the same time 4ohms and 8ohms taps on a Mac amp? I usually use a biwire for my Vandersteen 2CE Sig II but I would like to separate the biwire as in, tap the lows on the 8ohms tap and tap the highs on the 4ohms tap to get a little more low end (bass). According to McIntosh, since Mac uses the autoformer, you can use two taps at the same time.