Yup, $300 or less. I got a like-new pair directly from Sennheiser for $275ish around this time last year. HD650 cost me a bit more but still in the $350 range or so. Same sorta thing direct through Senn.

Thanks! Hope you enjoy them as much as I do. (And don't forget about the simple mods floating around in one of the threads here.)

Wow, I bought a slightly used one for $245 three months ago

Pulled the trigger on a new HD650 a few hours ago... $320 shipped

There are more, but I don't want to advertise. PM for the source if you're interested. I asked a large seller for a deal and they came through. I would like to share the deal if anyone else is looking. They told me Sennheiser has recently raised the wholesale price.

Finally, I think I'm done modding my HD600. Won't touch it ever again, except for maybe to change the ear pads when they go bad?

Pushing 3-4KHz down without cutting into the higher frequencies too much or boosting bass? It seemed like a fantasy, but somehow I achieved it.

Oh, and here's a bonus: lower bass distortion. At 100Hz, the stock measurement showed 0.399% bass distortion. Modded, it's 0.169%. That's a massive improvement IMO. It's very audible, and... I must admit, I'm loving it.

So what does it entail? Just... dynamat. Lots of it. And optional front damping if you'd like to fix the FR. To me, this headphone was a bit bright at stock, so I "fixed" just that.

Will post the process and all once I'm less lazy (or once my internet allows uploading huge images...). Now to finally enjoy my music and not have to worry about missing out on much. 

Edit: some photos went through so... enjoy!





Look, ma, no dust cover, nothing between ears and drivers!