The AC-30 is a super loud amp. Most people don't think the combo versions have enough power cause they have them on the floor pointing at their ankles, if you elevate them you'll notice that your ears start to hurt. They also pump out the high frequencies so they tend to cut through really well in a band situation. A bit about wattage: Don't let the wattage on the back panel of an amp fool you either. On some amps there are two wattage's shown, one is how powerful the output of the amp is and the other is the power consumption. Don't let the power consumption fool you into thinking how loud your amp will be. I've seen guitar shop retail retards get this one wrong. If the wattage rating is printed near a voltage/hertz rating say: 110V-120V 30Hz-40Hz 180 watts, then it relates to how much power your amp consumes or for a real world example; how hot your amp gets. if you compare an AC-30 to say a solid state 30 watt you will notice a huge difference. This comes down to how the output wattage rating is worked out. Solid state amp wattage is usually worked out via RMS (root mean square), remember that one from school? boring shit really. It's not really the true output wattage at all. If you see a wattage with RMS after it you can do some very rough math to work out loud it will be in real world terms. So say you are looking at buying a 100 watt Marshall Valvestate amp (please don't, they're a bit shit eh) you can work roughly what a quarter of that will be, so 25 and that about how many watts it is. Suddenly the AC-30 looking more powerful and it is. You can use this simple non-scientific method for most solid state amps to find out how loud it will really be. If your looking at getting an AC30 and putting it through a quad then your gonna have a very loud setup. Don't look for the amp to provide any output valve distortion/overdrive cause you won't be able to stand anywhere near it and it will drive any people watching you play out the door! Freddi was right when he mentioned the type of speaker you use, this has a very big impact on the tone your going to get. Another thing to watch is matching the ohm's for the amp and speaker cab. You can do all sorts of expensive damage to you valve amp by miss-matching these. I've seen burnt out output transformers, brunt out tubes and melted circuit boards. As far as I'm aware Mesa-Boogies are the only amps designed for deliberate miss-matching of the ohms.