Nikola, You can pay several hundred USD per piece for REL or VCap teflons, not to mention Deuland caps. Or, you can pay a few bucks or less each for the same value caps. So I think you would admit that price is an object when a manufacturer selects coupling caps for production purposes. Oh, they like to make us think they carefully selected brand X after arduous listening tests, but I think the considerations are as much economic as anything else. The story goes that you have to mark up your product by about 5X the cost of building it, in order to make money in audio. This means that a $50 capacitor, one on each channel, raises your retail price by $500.