I have now purchased 4 pcs (2 pairs) of Bursons new OpAmp V6 Vivid dual, and waiting for them to arrive! A big thumb´s up to the Bursonaudio´s costumer support, that are very handsome and easy to do with!! Just a small question; The spec´s are telling the V5 and V6 will pperate at a minimum of +-3,5/7 VDC. As my headphone amp only has 5 Volt to the OpAmp, will i be enough to operate the V5 and V6? Or is 7 VDC adding +3,5 AND -3,5?