I am in the process of adding a Benchmark DAC1 to my Mac Mini.

I was intrigued after reading accounts that compare the Benchmark DAC1 favorably with the Meridian 861 DAC. I also read accounts that the SB3 via the DAC1 compares with the Slim Devices Transporter.

Benchmark claims that their DAC1 is immune from jitter.

From their web site:

"Jitter-Immune UltraLock™
The Benchmark UltraLock™ system is nearly 100% jitter immune. The D/A conversion clock is totally isolated from the input digital audio clock in a topology that outperforms two-stage PLL designs. In fact, no jitter-induced artifacts can be detected using an Audio Precision System 2 Cascade test set.

Measurement limits include detection of artifacts as low as -140 dBFS, application of jitter amplitudes as high as 12.75 unit intervals (UI) and application of jitter over a frequency range of 2 Hz to 200 kHz.

Any signal that can be decoded by the USB or AES/EBU receivers will be reproduced without the addition of any measurable jitter artifacts. The AES/EBU receiver IC has been selected for its ability to accurately recover data in the presence of very high jitter levels."