Got a tiltback cab, amp is unreliable. I was thinking on putting a 1RU amp in it's place (width permitting) or one of those micro heads. The cavity on the back is 19.5" width,8.5" ht, 3.25" depth. There's a cut out on the top where the controls used to go,16.5" across, amp was mounted vertically in the cavity. Was also thinking on replacing the stock 150w 4 ohm speaker with something more robust, hopefully a neo. Any thoughts on the subject? Do-able? Not worth the effort? Better to just place the micro on top? Buy myself a nice higher-end combo? Will replacing the speaker disturb the space-time continuum? I realize that it's essentially a practice cab, but it worked well for some of the venues I play.