Nelson Pass amps

[LumiAudioNut]

https://www.stereophile.com/content/pass-labs-xa160-monoblock-power-amplifier-measurements

https://www.stereophile.com/content/pass-laboratories-xa608-monoblock-power-amplifier-measurements

https://www.stereophile.com/content/pass-labs-xa605-monoblock-power-amplifier-measurements

https://www.stereophile.com/content/first-watt-sit-3-power-amplifier-measurements

https://www.stereophile.com/content/first-watt-j2-power-amplifier-measurements

Not terrible, not great. So... mediocre.

I would add the Stereophile measurements for the Pass Labs XA-25, which I believe is the best measuring Pass amplifier currently sold:

Pass Laboratories XA25 power amplifier Measurements | Stereophile.com

Sidebar 3: Measurements I measured the Pass Laboratories XA25 with my Audio Precision SYS2722 system (see the January 2008 As We See It"). Before performing any tests, I ran it at one-third its clipping power (see later) into 8 ohms for an hour. At the end of that time, the top panel was warm...

www.stereophile.com

Definitely not on par with the likes of Hypex, Purfi, Benchmark, etc. but not terrible.