@amirm, I think your measurements are almost spot on what Topping have included in their specs (57 mW @ 300 Ohms, 150 mW @ 32 Ohms).
I believe they have an "off-by-2" error in their listings (counting the sum of both channels).
Was also curious: are you set up to perform cross-talk measurements?
I feel that this is an important performance parameter, and is often overlooked.
Well, that is unfortunate, as that would mean their A30 amp is way less powerful than advertised. I was considering buying it, but now it is a bit anemic for my use case. That, coupled with the output impedance, it doesn't look that appealing anymore.