After three TWS 3 replacements, the store I bought them from accepted money back. First pair broke in a week, second pair was good for a month, third pair worked for about 6-9 months. There was a 5-6 week delay between all replacement devices sent for repair. All exhibited the same problem. Left...

That looks like a very wonky folder. My setup folder consists of only one file and one release notes .doc. You downloaded that straight from Sennheiser?

Depends. I upgraded from the 650 to the 800 S and for me it worked great! I still occasionally reach for the 650 still but the 800 S is a great upgrade.

My HD 800 just had it's rubber insulation cracked too. It cracked itself, didn't twist it or drop anything on it... Oh my lord how expensive these cables are! Bought my HD 800 in 2013 so the cables lasted for four years.

I also had the T1 and sold it (preferred the HD650, and by a huge margin)   That's why I was surprised how much I love the HD800.

  I have to say...I have the HD800, Asus Essence ONE muses edition, and a Lake People G100 headphone amp and it is glorious.   One of the really surprising facets as that almost all sibilance is completely gone. I don't know how that is possible but this combo sounds really nice.

The HD800:   http://fc08.deviantart.net/fs70/i/2013/092/0/1/sennheiser_hd800___1_by_hmcindie-d60788r.jpg   http://fc09.deviantart.net/fs71/i/2013/092/7/c/sennheiser_hd800___2_by_hmcindie-d60795q.jpg  ...

The ONLY headphone that uses a ring radiator driver is the HD800.   Just to give you an example: HD650 left, HD800 right.  

  T1 does not have a ring radiator driver.    It is a Sennheiser patent. The T1 uses regular drivers.

  Except the Beyerdynamic T1 has a WAY worse peak at 6-10khz.   HD800: http://www.innerfidelity.com/images/SennheiserHD800.pdf   T1: http://www.innerfidelity.com/images/BeyerdynamicT1.pdf   I would not say that this is an issue because of a ring driver.

One thing though... If that peak is because of the ring driver, then why do so many regular driver headphones have it too?

Works pretty well, sounds way closer to the HD650 but still retains some of the HD800 magic. Though my dac + amp combo is already warm enough but I feel this could work wonders with some soundcards + hd800 combinations.

  When I plug the HD800 to the Asus Essence STX, it has too much treble and clinical. When I plug them into the V-DACII paired with a Lake People G100 amp, it sounds very neutral with almost no treble boost. When I plug it into my Onkyo stereoamp, it's somewhere in between but still sounds...

  I don't know what was wrong with my T1 but I enjoyed the HD650 more. Though the HD800 is on another level.

650. To me but everyone hears differently.