Notice the chromed transformer covers
They may have missed a marketing angle:
"Chromium is remarkable for its magnetic properties: it is the only elemental solid which shows
antiferromagnetic ordering at room temperature (and below). Above 38 °C, it changes to
paramagnetic."
Even if that doesn't mean anything it sounds good.
Glad to see the caps were rated to 105 degC, but if I did the math rightly then 888 W into 8 ohms means about +/-120 V
Does it have differential output? Seems to.
"Power Output Capable of Over 746W RMS (1 Horsepower) @ 1kHz x 2 Fully Differential Channels @ 8 Ohms"
Then 60V rails would do, wouldn't they? When the + is driven to +60, the negative is -60 (not ground), giving the 120V across the load.