Very unscientific, but here are some clips: First, all the controls on both amps were set the same on the lead channel. Here are the pics: Here are the raw, non-EQ'd clips. these are straight from the 57 on my Diezel 4x12 into the DAW. I lowered the waveform volume of the 100 watt to closely match the 50. At the same volume knob setting, the 50 was quieter (obviously). Limiter is added on the master buss to get proper levels. 50 watt: http://dl.dropbox.com/u/1160146/5150 mini mix.mp3 100 watt: http://dl.dropbox.com/u/1160146/5150 100 mix.mp3 The 50 watt is definitely brighter comparatively. Now, here they are with a little bit of EQ in my DAW...Still the same miked tones. These to me sound pretty much the same: 50 watt: http://dl.dropbox.com/u/1160146/5150 50 eq mix.mp3 100 watt: http://dl.dropbox.com/u/1160146/5150 100 eq mix.mp3 Mic was placed with using the 50 watt, so I'm sure that plays into it some, but overall I love both amps. the 50 watt's brightness makes it sit easier with less EQ overall. It also gets just as thick, but doesn't quite have the bark in the mids that the 100 watt has.