Anybody have the chance to A/B these combos. I just ordered the KB15 but since they are back ordered I can change my order to the KB12 IF I want. I currently have the older Kickback 12 with the aluminum speaker and 120 watts. I love the tone but need a bit more volume from time to time especially on outdoor gigs. Are the 500 watt versions with the Hi Drive speakers comparable in volume 12 vs 15. How about tone wise? Still nice punchy attack on notes which to me is the coveted Hartke sound? I know volume will no longer be a problem because I bought a radial big shot ABY box so I can stack the two combos IF I need to. Hoping I don't need to under most circumstances. I usually play medium sized clubs and outdoor festival type gigs. Any input is appreciated.