I'd like commentary on an idea I've had to record a guitar amp with another guitar-tailored speaker (used as a microphone, a la Yamaha's SubKick), and particularly one of the same make, model, and size. Specifically, it occurs to me that using a 12" Alnico Blue speaker right on top of my Vox AC 15 might be cool for the following reasons: 1.) Exact same frequency response, in theory 2.) The mic-speaker would cover the entire AC 15's speaker, so finding a sweet spot would be no issue 3.) Further possibilities, like the idea of putting the mic-speaker in different cabinets and using it as above, could add for different personalities Any help is appreciated.