This is a review and detailed measurements of the Dense Audio Adapt Reference DAC and Headphone amplifier in a "dongle" configuration. It was kindly sent to me by the company to review last fall and I am only getting to test it now. The Adapt has a retail price of US $209.99 but I see it on sale for $169.99. That is up there as far as price although there are likes of Audioquest that charge as much and more. There is apparently a "Standard" version as well at lower cost.