Sennheiser e 906 Instrument Microphone

The e 906 instrument microphone is a dynamic microphone utilizing a cardioid pick-up pattern for best gain before feedback. It was especially designed for guitar amps and is also excellent for percussion and horns.  

It's known for:

Lively, full sound
Very fast attack
Flat shape is ideal for miking amp faces
Three-position switchable sound character: bright, moderate, dark
Rugged metal body

We for sure love these on guitar cabinets more than anything.