Haven't had this problem very often but every now and then when I'm mixing a track with a very low 808 style sub it will sound well mixed on my headphones, monitors, and laptop speakers. However, when I go play it out over a large PA the bass will be far too loud and drown out everything else. I need some new tips and tricks on getting the sub levels in a strong, but not overpowering, range before I embarrass myself by playing a blown out mix during a set lol.