I own, have owned and have played through in no particular order: Trace Elliot, Ashdown, MarkBass, Crate and Ohm, Marshall, Peavey, Ampeg, Behringer and probably several amps. I have never had any trouble getting a good sound as long as I start with everything flat, and then either tweak what needs tweaking or leave it alone. However I have also see people twiddling the same amp and getting a crap sound by not setting input & output volume correctly, pressing pre-shape buttons & adjusting the graphic eq into smiley face.