The 3.1's have been replace by the [email protected] a set. I have the 3.1's on Mapleshade 4" stands, sitting on a Mapleshade 24"x24"x4" platform with three brass footers powered by two Alstine Ultra 350 amps with his Insight inverter bridge and the sound oustanding. They take 100 hours to burn in. I just had Ron Bauman's of Insight/Mapleshade Records do his upgrade to them which intells some upgraded parts and rewiring with thier ribbon wires. At one time he did the wiring for Anthony Gallo, and still doe research and development for Anthony. This upgrade puts them in another class. they sound much better than the 3.5 Gallo.