By doubling the bass part with a regular bass sound your get the right mix of attack and bottom.Also, it is much better if you can hook up to the PA using the XLR output at the back of the amp, because I really don't think the amp is loud enough. Use quality speaker cables and HDMI cables to get the best out of your system. I find a couple of notches above flat on bass and treble with the sub at +4 notches works best for me. xythiii likes this Please say what kind of music the settings work best for if relevant. The bass and mids should also be moderately high to smooth out any harshness.