I did go through the settings on the stereo and made sure the subwoofer was switched to on. I had the subwoofer volume control turned up to 8 with the gain on my amp maxed out. I can't remember if I did try it at 15. I'll try again tomorrow with it up to 15 and go through the crossover settings. I guess this one is a little more complicated than the 2 din Sony touchscreen I had.