Quote Originally Posted by garylkoh View Post
Async USB has been one of the biggest sources of bovine excrement in marketing DACs in the past year or so. It has nothing to do with data accuracy. All it means is that the incoming USB data stream is re-clocked. With sync USB, the clock of the USB receiver is synchronized with the USB transmitter (hence sometimes called adaptive because the clock adapts to the sending clock).
Async USB provides a simpler way to implement a low jitter DAC relative to adaptive mode USB. For the cost of a small number of lines of firmware code, you reduce the amount and complexity hardware needed and potentially reduce the cost of the hardware needed for a high quality result. Most thinking engineers appreciate simplicity and the potential for low cost designs that deliver the goods.

You can find plenty of bovine excrement in the marketing of all kinds of high-end gear. Marketing products using buzz words without supporting detail or test results works when the audience is technically ignorant.

Async USB got to be a hot buzz word for many audiophiles in the last year or two. You may be offended by the rise of the Async USB buzz word. However, I'm more offended by marketing of products that are not very good or are just snake oil.

Quote Originally Posted by garylkoh View Post
Async can have just as bad jitter as sync if the clock at the DAC is badly implemented.
A bad implementation can sink any approach. No revelation there.