I was playing around with low, mid, high gain, with varying 0 to 5.5db bass shelf. No matter how much I eq'd the bass on low gain it sounded like an iem, in my head. High gain gave me subwoofer like slam. This gets even more prominent with speaker amps which is what all rich people who have spent years searching for end game buy hundreds of amps end up with even if its moderately priced. Please note this is just for hard to drive planars and earspeakers. High power usually means more noise and is not ideal for sensitive headphones.