Can anyone tell me whether there is any gain from going vertical which I understand is one amp powering both high and low of one speaker? Does this not short across the two channels from the power amp - the Roksan literature recommends one amp to right and left low and the other to right and left high. The preamp has three preouts - I would use two of these one set of left and right to each amp. Then it would be choosing vertical or horizontal bi amp. Any ideas? Cheers Hubert[]