I'm interested in getting the QSC GX5 power amp to power my 4x10 cab, but must I also get a preamp? This might sound dumb, but I really like the built-in preamp and pickups on my bass (Glockenklang and Delano) and I don't want to color it with anything else. I was planning on putting my bass through my DI (JDI) box straight into the QSC amp, which will be connected to my cab. Will this work? Thanks in advance.