most difficult speaker to please


Which speakers have you found MOST difficult to drive, place etc??
desoto
Of those I've owned:
Ohm F
Apogee Duetta
Apogee Caliper
Bose 901 (original version, Series 1 circa 1971)
Not the most difficult load ever, but, I had a pair of Egleston Rosa's that just ate up a 600 watt Mac amp (602). It's no Apogee but this relatively small speaker had quite an apetite for power.
definately not an expert...actually know almost nothing about apogee speakers, but i seem to remember reading that if the Apogee Full Range is run direct it present a 0.1 ohm load.