The bipoles' bass has greater extension, down to about 40hz in-room, and much greater bass impact. With the network in place the bipoles' octave to octave tonal balance is more convincing. The Zigmas have that classic "little FR driver" forwardness and limited bass impact, the bipoles don't. The Zigma's are more sensitiveand are a much better match for a small single ended tube amp. The Zigmas have more precise imaging, the bipoles have a deeper and more diffuse soundstage. Bottom line is if I auditioned these two speakers blindfolded I could instantly tell you the Zigma is a small driver full range. I would not be able to identify the bipole as a single driver or as having a small driver. If I had to choose only one pair to live with the rest of my life I would choose the bipoles.
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