heres an andther method. try using 2 mics at once. sm57 about 3 inches away from speaker 30 degree off axis, then use a different mic preferably a condensor mic 3 to 5 feet away about 1foot above cab. eq each mic differently pan hard left and right.after you have recoded them run seperate delay units on each one. run about 30 millseconds of delay on one, and 40 on the other. these times are varible up to 70 millseconds( approx.)then send themm threw a reverb unit. this way you are recording in stereo, and the delay will give you clarity.