Pass Labs is another that truly doubles down
Many manufacturers understate in their literature the 8ohm wattage so the 4ohm and 2ohm wattage looks to be doubling.
It's only on independent tests this shows up the 8ohm to be higher and the 4ohm or 2ohm not doubling.
Here's what I mean, both taken from Stereophile on one of the latest 60 .8 series.
Manufacture: Specified as putting out 60W into 8 ohms and 120W into 4 ohms (both 17.8dBW),
Stereophile measured:
The XA60.8 considerably exceeded that power, delivering, at 1% total harmonic distortion (THD), 150W into 8 ohms (21.8dBW, fig.4), 240W into 4 ohms
So you see 150w into 8ohms but only 240w (not 300w) into 4ohms, where's the other 60w gone????
Cheers George