I recently upgraded my front speakers from Tannoy mx1s to mx3s. So far I've kept using my single QED SA cable to the fronts, thinking that my amp wasn't compatible with biwiring because it only has 2 outputs for each speaker whereas biwirable speakers have 4 inputs. But is it still possible to biwire, and if so how? Also, if I do biwire, can it be done by buying another equal length of QED SA, or would it be better to pay the extra for a proper biwire cable? Thanks, Nick.