I use the px4d for practicing, etc. I have a big heavy amp that I use for real band stuff. However, instead of lugging the half stack, I wanted to see if I could bring something smaller to more low key rehearsals. So I want to hook the px4 to a cabinet. When I run a speaker cable to my cab, it is way way way too quiet. Do I need a preamp or something to boost it to use it this way? Or is this just a stupid thing to do and I have to go buy a small practice amp? Thanks for the help.