Seeking Impedance Info on Acoustat Spectra 11s

Hello everyone! I would very much appreciate it if anyone could provide me with the impedance profile (not simply the nominal impedance) of the Acoustat Spectra 11 hybrid electrostatics. I'd also be very curious if anybody has an opinion on why the Spectra 11s sound so much better being driven by a Golden Tube SE-100 amp as opposed to a Llano Trinity 200. Thanks in advance for any input you'd like to provide. Mike