As I’ve said in the past, I prefer to mic my guitar amp in the control room of my home studio. It’s problematic at times due to monitor bleed, but with some spiffy mic placement and padding I’ve found I can make it work pretty easily. This is not to say this technique is right or wrong, this is simply what works for me.
When my Friend and song writing M8 returned from IPR in Minnesota, he had some interesting concepts on microphone placement. If you had asked me if I thought mic’n up an amplifier in a control room would be useful I would have answered probably not. What my friend had suggested was moving the placement behind the monitors on an opposite wall that’s well sound treated. Using a cardioid or hyper-cardioid microphone is necessary with this placement, some padding and shielding has also proved helpful. This technique is not useful with a second room mic for blending.
In front of my amp in a rotation counter to the monitors, I’ve placed an Audix i5 (My go to Mic for guitar and snare drums) utilizing an sE reflection filter. I’ve also padded the wall “down wind” against any reflection from the monitors. With the 22 Watt amps channel volume at 7, the drive at 7 and the master volume at 5. The result is a complete gated effect with no substantial bleed from the monitors.
The mic placement I use is on “the rim” placed all the way to the wood of the cabinet. I never place the microphone center cone or off-center cone. When recording make sure and mute the track recording is engaged on to keep the monitors from feeding back. I know it’s obvious but I forget to do this often. I’ve used this technique on multiple projects in the last year with great success. Give it a try and let me know your results!