Not only they double down, their power specs are very conservative. One example: the lowly XA30.5 is in reality a 130W@8Ω / 195W@4Ω amplifier, according to Stereophile measurements.
"Do Pass amps down with impedance?" It depends on the specific amps. Some of the older Pass Aleph amps won't, and many of Pass's First Watt amps certainly won't. On the other hand many will. Nelson Pass has been most generous designing different amps for different applications.
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