Thanks. I didn't know that the DAC only worked with a USB input! I had assumed that it would work through anything. So that's good to know thanks. My family have tried the amp and all seem to agree that it improves the sound quality slightly. I expect that the difference will become clearer once...

After reading some very good reviews for the Fii0 E7 headphone amp and DAC I decided it was worth buying some to improve the sound quality of my iPod.   To me, the sound quality when using the amp is almost identical to how it is without it. It does sound slightly better to me when I know...