Pete Thorn - "Road Guitarist's Studio"

I liked this bit:

Phase Coherency Test1.) Without a guitar plugged in, turn up the gain of the amp you are using until there is a fair amount of hiss coming from the speaker cab. Send this signal out through a headphone send.
2.) Next, invert the phase of your second mic on your mic pre or in your DAW using a plug-in.
3.) Listen to the sound of the amplifier hiss in your headphones. When you move your second mic towards or away from the speaker, you will hear the hiss level change as the mics go in and out of phase with one another. The position where you hear the least amount of hiss is where the mic should be placed. This is because when the second mic’s phase-reversal switch is flipped on, the sound should cancel out as much as possible. Unflip the phase on the second mic, and voilà, you should have a great tone when the two mics are blended. My SM57 and sE VR1 mics shown in Fig. 2 are aligned for proper phase. You’ll notice that the VR1 is placed slightly back from the SM57.



Read more: http://www.premierguitar.com/Magazine/Issue/2013/May/The_Road_Guitarists_Studio.aspx#ixzz2VBqBBwNi
 
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