This thing is a NIGHTMARE!. Where do I even begin at the trouble this thing caused me!, to explain how much hassle this thing is in full?, I'm going to need to make you out a LIST, I'm seroiuse, theres that many problems with these things, they shouldn't really be alowed to sell them full stop. First off the main attraction with this amp head, is that its 1000 watts power rating, no more power issues on stage, but when you push it past two thirds, (using compatible speaker cabinets of course, 8 Ohms, 1x15" 500 Watts, and 4x10" 1000 watts), the sound breaks up and farts something awful, not a good rock distortion, but like a "that speaker sounds busted man" break up sort of farty, split cone kind of sound. Bottom line?, this thing can't turn out 1000 watts as advertised and keep stable, it overloads 'way' before that at around the 700 mark, the maximum this thing can do without breaking up, is 700 watts before its just too much. I wanted to SUE Hartke over what this thing put me through, if it said 1000, I expect it to be able to do this competantly, by the time I managed to figure all this mess out, it was far too late to send the amp back for a refund.