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RE: "extending the lower bass of the panels" ...

Posted by Satie on March 21, 2017 at 08:27:12:

They say it is nearfield right on the caption. That is how they get "quasi anechoic" in the bass. Atkinson details these measurements somewhere on the Stereophile website.

Part of Pass' philosophy is to avoid using too much feedback, so he can't rely on it to entirely flatten out non linearities in the output devices. He is mainly avoiding high order odd harmonics so far as I understand it and that relates to the HD spectrum in air - which does not contain those. And his DIY projects going into the First Watt concept also try to avoid time domain issues due to overly aggressive feedback, which is something he also worked into his "regular" AB and Class A amps.