There is no reason, when even a $5 MP3 player has EQ presets, that headphones shouldn't be aiming for a flat frequency-response curve. Sure there is. The marke

There is no reason, when even a $5 MP3 player has EQ presets, that headphones shouldn't be aiming for a flat frequency-response curve. Sure there is. The market might prefer a baked-in EQ preset. In fact, different subsets of the market may prefer different presets. And that brings it back to the grandparent's point. The customer is always right; even when they're technically wrong, their preferences are what count.