So you are saying that all Spectral amps can't handle impedance loads lower than 8 ohms? Oh Terry...
Additional info ,
You will find and using the Spectral as used by Ack as an example , that amplifiers will sound better if used in there quiescent power range which in this case appears to be 2 amps /ch ..
Hence my recommendation for the Spectral to Be used on high efficiency 8 ohm speakers , this is not to say it cannot be used on anything else as you implied with your usual specious argument ..
As simplistic as possible ,
You see SS AMPS. Tend to suffer thermal drift and designs are made to compensate for such , dependent on usage , it's for such reason Pass uses such high bias and temperature control , as he forces the amp to stay into its thermal sweet spot before drifting changing sonics. Some choose another approach prefering to use cooler operation , as that spectral heats up and operates out of its quiescent region distortion increases , yes you may like it sonIcally , when steaming along , just means you are in favor of its distortion signature and others may not ..
This is why there's no consensus in audio or very rarely , so stop knocking and start enjoying ..
Regards ,