IM THINKING OF GETTING THIS SPIDER 4 150 2X12 COMBO...IT HAS EXTENSION SPEAKER OUT,....IF I HOOK IT UP TO A 4X12 CAB, OR EVEN A 2X12 CAB, DOES IT CUT THE 2 12s IN THE COMBO OFF????OR DOES IT LET THOSE PLAY,TOO????? THIS IS A BIG QUESTION FOR ME BEFORE I PURCHASE THIS AMP....PLEASE EMAIL ME ASAP AT AXEGRINDERJ@GMAIL.COM....THANKS...A DEFINITIVE ANSWER WOULD BE MUCH APPRECIATED...