I have tried all combos of drivers and cups. Th900 with 500 cups are full of bass. The biodyna driver moves freely and really pushes air, however without a measurement rig, it’s difficult for me to say whether sonically accurate or not.

The 500rp cups are as open as it gets. Very little resistance honestly. The original tuning is more for reflections that air management.

Pics of some cups , and Fostex. https://imgur.com/a/gyiG4qx

Been gone from the forums for a good while. Need to catch up. Anyways... PM me. When I was going through the whole open back project I acquired 4 sets of th500rp cups. May have some to sell.

Right so I really don't have pictures and if I do id have to dig them out of last years picture backups but here is how I started and where I ended up. here we go: - I first got TH600s and did stage 1 lawton mods and pads - Then I got TH500RPs, and took those Aluminum open cups and put them on...

Thanks. One thing also that I did later was swapping the planar driver itself. So the original 500RP used a mk2 driver, and I swapped in a mk3, and it was a huge improvement. Kind of like the improvements from the t50rp mk2 to mk3

So that was my initial project. I was working on those headphones for a while... what I did instead of putting biodynamic drivers into the TH500rp frame.. I put the TH500cups on TH600s. Basically the same thing. And the aluminum open cups screw right on. It sounded insane. Different to...

Hey guys not sure if this is a repost but has anyone seen this?   http://fostexsound.ru/products/headband/th-900-black-limited-edition/   Its supposed to be a limited edition th900 with gloss black cups....   Looks pretty damn nice.

I've got Lawton pads on mine and I love them. Nice sound difference, and comfort is much improved to my ears YMMV

OK for someone for hats never heard then yggy... what can I expect? Better or different sound? Sorry but I'm kind of an amp rookie

Hmmm this Modi multibit talk has me wondering about selling my Magni 2 u and upgrading. Will I hear difference going from Mac Pro usb to multibit. Files are ITunes ALAC.

No i actually haven't gotten around to tuning anymore since i don't have measurements rigs. I'm working on piecing one together before ago further because the sound changes enough to not really know where the measurements are going by ear. at least to my novice ear.

Dibs! You have PM

OK got it any quantifiable difference among them?

So overall, which driver would be more desirable... TH600 or THX00? Really wasn't aware of that magnets difference but sure enough I just noticed it. I read somewhere that the TH600 magnets were the TH900 rejects. Not sure how true that is.