So, connected to my new second generation XPA-5 these sound great. The midrange performance greatly improved and the trebles became tighter. Bass is strong, but a subwoofer is needed for a full range sound. Playing isolated sine waves reveals that these speakers will reproduce bass down to mid 20 Hz range (barely audible at 20 Hz), but at too quiet a level to be usable in normal music reproduction. These speakers like thick wire. After I switched to 12 gauge wires the towers became warmer without losing detail in the trebles.
