The HX Stomp has a 1/4 line level that you plug into the PA. So you can be amp-less. This video shows how to bi-amp starting at 5:30That makes sense, so then might I ask why I did a bit of research and found out I can bi-amp with an HX stomp. Basically i understand that I need 1 "hi" path and 1 "lo" path. So even with that I still need bass amps?