Yes a lot of current is needed and a lot of power for higher SPL's, as the scintilla is only 85db at 1ohm, it's a little less sensitive at the 4ohm setting at 79db. They made two versions one that could be set to 4ohm or 1ohm and a version that was only 1ohm, the 1ohm version is more preferred. There are a few people on the diy forum that are direct driving them with multiple amplifiers and active crossover, I don't know if any production amps can direct drive the midrange ribbons as they are .14ohm, but a few guys over there have built amps that can direct drive them without using a resistor or a transformer, supposed to sound better direct driven.