dengief, welcome.....I am not sure what Mr. V is indicating....I am running my pair of STA 200s in a vertical biamp situation ( something I have been recommending for a while now, given having two identical stereo amps, or of the same, 4 monoblocs ), and I am having no issues to speak of. The speakers I am using are a pair of Signet floor standing towers ( I was a rep when I got them ), and they sound very good being driven this way, and of course, with the NF amplifiers. I have used professional Yamaha amps, Hafler amps, Citation amps, and some others ( I had a s---load of power amps at one time ), with the same configuration, with excellent results. I owned 2c’s, and later 2ci’s ( in the past ), and have had clients with them, and never an issue, and vertically biamped them, too. Unless Mr. V. is doing something different with the latest incarnation of the model 2s, I do not see a problem. I have always preferred, is sq, vertical biamping vs horizontal, and I have done so with Martin Logan, B&W, Kef, Klipsch, Legacy, and others, that had the passive biamp ability, without issues. I would encourage you to read the manual of the Vandys. I hope this helps, but if it does not, I do understand.....my best, and Enjoy ! MrD.
