The O/96 is a great speaker; 2dB less efficient than my Classic Audio Loudspeakers.
Ralph, if I recall correctly your speakers are 98 db/1 watt/1 meter, and the O/96 is indeed spec’d 2 db less than that, at 96 db. However John Atkinson’s measurements in Stereophile showed the O/96 to have a sensitivity of only 91 db/2.83 volts/1 meter. For its 10 ohm nominal impedance that would correspond to about 92 db/1 watt/1 meter.
Which would seem to give further credence to your (and JSautter’s) advocacy of more power than most SETs can provide.
I feel like my Coincidents were powerful enough. But now you are making me doubt that. Will put those amps back in, listen more and get back.
To state a fairly obvious point, I would just suggest that you make a point of including recordings having particularly wide dynamic range in your assessment. Such as many recordings of classical symphonic music, if you listen to that type of music. For a given average volume, recordings of music having narrow dynamic range and/or recordings that have been engineered with a lot of dynamic compression are of course less likely to reveal the issues Ralph and JSautter have referred to.
Good luck. Regards,