I hadn't really looked before, but one reason could be their idle power consumption - 350w each.
Granted, this is because their design goes up to about 6w in pure class A, but still, 700w for the stereo pair is more power draw than a Pass X350.8 and just below that of a pair of X260.8s.
Surprisingly, the heat sinks aren't at all warm, unlike say the Pass amps I listed above.
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