it's got 6550 tubes in it, so it's putting out about 100W (instead of 80W) & this thing is LOUD through the 115 i'm playing with, even at a low setting. i was thinking about getting an ampeg 610 cab, but after trying out the different ampeg cabs at guitar center, i'm wondering whether i'd get a better "depth" or variety of sound with a 4X10 plus a 1X15. i play hard rock/heavy metal with a bc rich warlock, alot of melodic bass (kinda in the steve harris genre) & don't care too much for major distortion, but want the low end to shake & the high end to sound clear. somebody told me the bigger speakers have a wider range of sounds - low & high, & the 10"s are good for midrange. any opinions would be much appreciated!