So in another thread I talked about adding some material inside the earcup to help with the weird upper mids and low end roll off of these cans. I then ran accross the thread about using sinegen to check for frequency response so I gave it a try. I found huge dips and peaks. I use an EMU 1212m sound card and in patchmix it's a snap to install parametric and shelf eq.. I was able to smooth things out considerably. The hd595's sound a thousand times better. When I bypass the eq I can't believe how crappy they sound. Here are my settings.
Your ears may vary.
-7.5db @ 3150 8 semitone width ( there is a huge peak centered around 3k leading to a cavern at around 4250 )
+6db @ 4250 4 semitone width
+5.3db @ 5185 4 semitone width
+5db @ 7400 4 semitone width
Low shelf boost @ 100hz to tase ( I like at least 4 db )
I chose to ignore the peak at 9-10k since my old ears are toast after 12k.
I have mixed music for years and try to use a less is more attitude about eq so these settings suprise me. A 13db swing between 3k and 4k?!! I guess it shows how varied and unpredictable headphones can be.