I have the Duetta Sigs., it is the impedance more than the power you have to worry about. My Tandberg 3026a and Meridian 605s are both rated at 150 watts but the Meridian would drive them and the Tandberg would not. I don't think bridged is a good idea because bridging an amp usually limits its ability to handle low impedance loads. The hybrids are another case entirely, much easier to drive. The original Apogee , which was bigger and had an even worse impedance curve, worked very well with the Classe 25 watt class a amp. The tube units with transformers should work, I have never used them, I did use a custom hybrid with mosfet outputs that had about 100 watts and it worked fine. Look at power supply design and not rated output.
