Well, I've got the Tech 21 power engine, and it sounds great. just like it would sound live running through a big PA. I also have a Yamaha power mixer and a peaver 12" floor monitor that I'm going to try as well. But as for the power engine, that little bugger can get pretty loud. it's just right and what I was looking for. Don't have the PA yet, but I'll let ya'll know how that turns out as well. If not so great, I've got penty of other uses for it...he he. Man! I'm really starting to aquire too much stuff..lol guess I'm turning into a gear head. let's see, and now to start back on the guitar collection