I want an headphone that uses bio-cellulose diaphragms. This is meant to be a natural fibre that makes a more natural sound. They used it in the mdr-888, mdr-cd3000 and mdr-r10. I have the 888, the 3000 is not available anymore and the R10 is too expensive. So, all I want is a medium priced bio-cellulose headphone in the MDR-CD3000 price range.