I have been using the fishman platinum bass pro eq preamp. i set it the way i like it and rarely need to change it very much. it has alot of features like DI out and it can be powered by phantom power from a sound board. I play in just about every setting you can think of and it has been great. the nice thing is you can get the sound you like and give it to the soundman so you don't have to rely on their idea of what you should sound like. the full cirlce and the preamp seem to jive very, very well. the depth knob is great-it gives you fullness in the low end but in a better way than if you just pulled up a certain frequency.