One thing you can try with headphones is changing the earpads: specifically the shape, but maybe also the material. I have Shure SRH840A headphones, and out-of-the-box I was NOT happy with the sound. Someone suggested trying different aftermarket earpads, and I found a pair of "angled" pads that changed the sound quality to exactly what I wanted. I was surprised how dramatic the effect was. The pads are huge and look ridiculous, but I only use these headphones at home so it's fine.