Review on Bundle: Sony MDR7506 Closed Ear Headphones with Knox Gear Compact 4-Channel Stereo Headphone Amplifier - Professional, Folding Design (2 Items) by Keisuke Shimizu ᠌

Miracles don't happen. The bottom is failed, and you should not think that this is because it should be so in a flat profile. Should not, there is no bottom. The lower middle is not bad, 1000-3500 is not bad, 3500-8000 is some kind of trash, somewhere normal, somewhere dirty. And again, not because they are strongly "smooth". but just because. Mixing with headphones is like a religion, it's better not to argue, but you can do the rough work in headphones and everyone does it. So in these ears, by default, this is hard to do, because it sounds disgusting.