Back when I had my 1.5's I used AP Oval 12 bi-wires and then went to HT Pro 9+ single wires with HT jumpers and prefered the HT. Not really a fair comparison as the cables were not from the same manufacturer not were they the same model but it may indicate that a very good single wire application may better (depending on your ears) a "lesser quality" bi-wire application. As always YMMV...