Just because you are using 2 mics does not mean you are recording in stereo.
For cabs, I often record with an SM7 and/or a C2000B in front, and an AKG D112
in the back of an open cab. It is usually a good idea to reverse the phase on the
D112. Hard panning of this arrangement will not produce a stereo image, unless you are an Andorian, with your ears on antennae. Then you could put one ear in front of the cab and one behind it. I blend the sound of the front and back mics, but in the end, it is 2 or 3 channel mono.
Stereo recording involves an attempt to create a model of what you would have heard if you had been in the room, using 2 or more mics. This doesn't mean that all stereo mic'ing is binaural. In spaced stereo mic'ing, the mics may be 10 feet apart, even though your ears could never be. It will be necessary to play around with the panning to generate a believable stereo image. But just because 2 mics don't necessarily produce a stereo image doesn't mean they don't sound good. Stereo recording is just one way to use 2 mics, not the best way or the only way.-Richie