I find the Diana Krall CD that I mentioned above absolutely awesome to listen to especially when the fireplace is on and my wife is giv...I better not go there .

By the way, the bassist is Christian McBride (who apparently is one of the best on the planet) and his 4-string bass plays down to 40Hz. I was just listening to it and it even sounds great with the 600 turned off. The 600 however adds some real deep depth to the sound.