I've been running through an old tko65 combo off peavey, and I think it's extremely powered. on the back it says "65watts @ 8ohms speaker) but it also mentions that it sucks two hundred watts out of the wall. I've tried combos of the same setup (fifteen inch speaker) and nothing seems to beat it. the yorkville xm200 was louder (just barely), but it's also competed with an ibanez 100 watt amp, rogue 120b, and an ibanez b100R. i could honestly say to my ears it's just about as loud as all of them. so how much am i really pumping, and if i were to upgrade to something with 800 watts (xs800h hooked with an avatar b212 or something) would it seem a lot like twice the volume?