I just purchased a Crown XLS 1500 at GC on Black Friday. I should have bought two of these versus my XLS 402 at 26 lbs. Sure would make my SKB GigRig much lighter. OK, So I'm throwing this post out to many of the forums to get peoples opinions and since I use Crown Amps, this seems like the right place to post. So here goes: I've been so frustrated with different schools of thought on live mixing. FIRST SCHOOL OF THOUGHT: The board mfrs (Mackie, Tascam, etc.) tell you to start with everything at zero. First adjust your gains (line/mic) to pre-clip, adjust your master fader to "0" and then adjust your channel faders. In other words, they are saying "Peak the Source". Then adjust your power amp for proper volume. SECOND SCHOOL OF THOUGHT: The amp mfrs (i.e. Crown, QSC, etc.) say to crank your amp volumes all the way up since they only control input to the amp, not output and to adjust the gain, channel and master faders at the source (mixer). In other words "Open the flood gates". I don't agree with the latter and I think that's old school. I can understand if you aren't in control of your amp, you don't want some musician coming along and cranking your volume levels and potentially blowing out your PA speakers. Another issue I have with the latter is that my mixer (Tascam 164UF) puts out to the DAW (Sonar 8.5) post-fade so If I don't peak my source, I get a very low Db recording. Can't raise the gains in the software high enough (+6 at max). Now, if that isn't confusing enough for you, lets match PA speakers to amps. They say a good rule of thumb is to choose an amp that is 2x the continuous power rating of the speakers at a specific ohm so you get enough overhead with a clean (non-distorted) sound. So, in my setup I use a Crown XLS 1500 that puts out 350W into an 8 ohm load. My Peavey PV115 are rated at 400w Program (continuous) @ 8 ohms. So the rule of thumb doesn't work here, I have plenty of overhead, would never be able to overdrive/distort/destroy my speakers. Maybe, I'll grant you, I'm underdriving them a bit. It's amazing how the levels of my amp never exceed 4 on a 1-10 scale and put out 95db's at 20-25 feet. Everything seems to be a "Rule of Thumb" and the "Schools of Thought" are what people have been conditioned to think (taught by others). OK, here's your time to chime in here!