It's warming up now. The air is coming in, and I should note that its currently on the 4ohm taps. I recall the 8ohm taps being a bit more airy but with less definition to the sound. I'll try that before I switch it out. This is an AWESOME sounding amp. Things have been crazy here and I've never had it with all my best gear at once, nor with my speakers on their much better Foundation stands. The midrange is thick and palpable, the image is out into the room. The 'you are there' or, "they're here with me" aspect off the charts with this amp as paired with the transformer volume control. Let me switch the taps and see what happens.