I also heard the Zus just one time and found them a little glarey and etched - upper midrange/lower treble hardness. I also, as Nonoise said, found them to have a metalic flavor, kind of like the old Acoustats which had a (non-fatiguing) plastic quality. Most speakers have a flavor like some material - Spendors and Harbeth always sound like wood to me and are easy to listen to but a bit boring.
However, this metallic tone is something I cannot tolerate for more than 2-3 minutes.
However, this metallic tone is something I cannot tolerate for more than 2-3 minutes.