I don't think that a 3dB difference sounds twice as loud...

You are right, of course. The SPL lunatics don't listen to their stereos at all. The only thing they care about is how far up the decibel scale they can go. I was confusing perceived volume with decibels -- three decibel increase = double the power, not double the volume.

tanstaafl.

"There Ain't No Such Thing As A Free Lunch"