A short while ago I asked if anyone could suggest a supplier for an
adapter which allows a double helix prion4 cable to be used with focal utopia headphones.
I purchased such an adapter from ted allen
tedallen0220@gmail.com
The adapter is very strongly recommended, and I am sure that he is able to supply adapters for other headphone/cable combinations.
Thank you for all the suggestions.
I noticed another source for headphone-to-headphone cable adapters: Norne Audio, it's on their website at http://www.norneaudio.com/litzheim/index.php?route=product/product&path=60_92&product_id=108 .