I have been using a Musical Fidelity Nu Vista M3 integrated amp together with a Nu Vista 3D CD player and a pair of ML SL3's for the past six years and so far remain very happy with them. Recently a friend suggested that I should consider bi-amping, something I have never been too sure about, saying that he knew someone who had bi-amped a M3 with a Nu Vista 300 amp with very good results. Does anyone have any knowledge or experience of doing this and assuming that I could locate one of these rare amps, would it be worth the expense.