The Purist Audio adapters all seem to be $150 plus each, which is kind of expensive just for an "adapter". I have found that the Black Cat BNC-to-RCA adapters are excellent and are only $30/pair:
https://www.blackcatcable.com/collections/accessories/products/black-cat-bnc-rca-adaptors
They have the best resolution compared to every adapter I have tested. The gold-plated adapters that come with the Nordost cables (and that you can get cheap on ebay) are nice and they warm up the sound some to give the cable a little more engaging sound, but they mask resolution in the end. The Black Cat adapters do not mask resolution, but it may be too revealing on a cable that could be a little bit sterile.
The Canare adapters aren't good at all in my opinion. They sound extremely warm and the high frequencies are soft and a mess (great if you like that sonic signature -- like listening to a warm Parasound amp).
https://www.blackcatcable.com/collections/accessories/products/black-cat-bnc-rca-adaptors
They have the best resolution compared to every adapter I have tested. The gold-plated adapters that come with the Nordost cables (and that you can get cheap on ebay) are nice and they warm up the sound some to give the cable a little more engaging sound, but they mask resolution in the end. The Black Cat adapters do not mask resolution, but it may be too revealing on a cable that could be a little bit sterile.
The Canare adapters aren't good at all in my opinion. They sound extremely warm and the high frequencies are soft and a mess (great if you like that sonic signature -- like listening to a warm Parasound amp).