I have done this before with bad results because the mics are so similar that they create problems and audio artifacts and such. Is there a way that I can however use them at the same time to mic my amp? I believe that they both result in good sound that is different and adds to eachother nicely. Hopefully there is a smart way of doing this. I have done it this way... Close miking with the 57 positioned at the edge of the speaker and angled to point at the center of the cone with the i5 pointing at the center of the cab 3 feet back.