Mic the monitor

To record the "air" that I would get when recording old school - guitar > amp > cab > mic > board > ProTools, has anyone tried micing their monitor while using their 11 Rack exclusively? I get some great tones out of my 11R but am thinking of micing my Yamaha powered monitor tonite while using some of my favorite rigs. Probably in a thread here somewhere but I just could not find it. Thx