^^^.The 800S has an sensitivity of 102 db so it's not hard to drive,it's the 300ohm impedance that stresses amps.The MAC "High Drive"refers to it's being designed for high impedance cans like the 800S...Direct coupled(transformerless)tube amps love high impedance like the Senns.but can't handle really low impedance like the new batches of Planar Magnetic cans which love Transformer coupled amps...
The MHA series control amps use MacIntosh Autoformers and will drive ANY can on the planet including all Stax and Electrostatic headphones...
The MHA series control amps use MacIntosh Autoformers and will drive ANY can on the planet including all Stax and Electrostatic headphones...