Hello,
I am driving Klipschorns with Bob Carver 350 Monoblocks. The Khorns have Volti upgrades, so they are a bit more sensitive than stock...somewhere between 106-109 db. The Carvers are dead quiet and sound great, to my ears, and the sound is pleasurable through all volume levels.
The Audio Science Review has the Carver amp rated near the bottom of the SINAD performance chart, but they are the only tube amps on the chart as far as I can tell, so that's not really surprising:
https://www.audiosciencereview.com/forum/index.php?search/40845019/&q=carver&o=relevance
I would like ASR to do some reviews of similarly priced/powered tube amps and see how they fall out C/W Carver.
Based on the ASR chart, the Benchmark AHB2 is the cleanest, most accurate amp they've tested so far, so I have been planning to purchase one to C/W the Raven monoblocks on my system to see if there is an audible difference between the best and the worst measuring amps on the ASR list. Should be quite interesting.