I picked up the Zen DAC this weekend to try to use in the summer months why my desktop system is too hot to use. My first impressions:
- Seems a tad bright compared to any other system I remember using. Maybe a focus on lower treble. Bass seems punchy.
- On some headphones, the bass boost button is nice (more on this later). Works well with Hifiman Arya.
- Gets my headphones and iems plenty loud. That said, I find it doesnt sound super great with Arya. Makes them a tad bright and brings out a harsh upper mid-range that I have also found using these and other hifiman planars on lower powered amps.
- There is white noise when using with sensitive IEMs. Its much more noticable on 4.4mm than on 6.35mm. I heard audible white noise on my Viento IEMs. Not a huge deal as it's not audible during music playback.
- Powermatch (gain) seems to add a little more noise too. More so than other amp gain stages.
Overall, seems like a stellar value at $129 for a small dac/amp combo with 4.4mm (I love this connector...)
I wish it had more I/O but for the price and coming from a well-established company, it's a pretty good value.
Here's what the True Bass switch does. I measured an Etymotic ER3XR before and after turning it on and subtracted the difference to make this plot. It's measured on a RA0045 clone (IEC-60318-4) coupler.