Pass Labs XA 30.8 Standby power draw?

Your question got me curious so I decided to measure my XA30.8.  In standby mode, with only the little blue LED light on, it measured a mere 0.3 watts.  Perhaps it's powering little more than the LED in this mode?  When turned completely on but with no music playing it measured about 265 watts.  With music turned on and at a volume higher than what I'm comfortable listening to I got it up to 290 watts draw.  I suspect the 375 watts is calculated based running it flat out at maximum possible power output.

When I'm not listening to it I leave it the 0.3 watt mode.  Once fired up all the way I find (and have read) that it take up to 1 hr to be fully warmed up.

The spec on the Pass web site states 3.3A at idle, which is around 400W.

Thanks for the responses.  Yes, 375-400W when powered on is what Pass publishes. I am however surprised by such a low standby draw of only 1/3 watt.  For some reason, I was expecting more of a power draw in standby mode.  

How did you measure the "power" consumption at various stage? If current draw, where on the amp?