Today I visited BH Camera shop in NY. I had a chance to hear a lot of headphones, from different brands and priced very differently.
1. The Kosses are surely nit the best headphones out there. But they do try to have the same character that the best headphones have - to be truly neutral.
2. I liked Sennheiser HD650 more but not the 598 or 600 - too layd back sound.
3. The headphones I personally liked the most are the P7, QC25 and Fostex TH500RP. So it will be really challenging to change the Kosses to something at least as good and not get broke in the process.
Everyone is entitled to their opinion, but I totally disagree with you. The Sennheiser HD600 is audiophile quality whereas the Koss Pro DJ-100 is not.
The Koss is like a toy compared to the HD600. The overall sound quality of the HD600 is so open and smooth compared to the closed and canned quality of the Koss Pro DJ-100. I know this for a fact as I own an HD600 and used to own the Pro DJ-100 which I returned.
Want even better, more open and vibrant sound than the P7, QC25 and Fostex TH500RP? Have you tried Grado's? Especially the new 325e!