I am not sure if this thread should be here or in the Car Audio section, since it encompasses both fields, but I was just wondering if anyone has tried using the optical audio line out or USB audio from the Mac Mini to a small form factor DAC? For example, the HeadRoom Micro DAC (see HeadRoom Micro DAC). I have listened to this small DAC and the headphone amp that goes with it at HeadRoom (all of the HeadRoom brand equipment is made about 15 minutes from my house) and can attest that these things make audio from any source, including my PowerBook sound superb. I was just hoping that someone had tried a similar set up to see how they work in the car-computer environment, since I am hoping that once I buy my Mini to include on of these inline between the Mini and my amp. Thanks!