I'm the designer of ZO2 and would like to clarify a couple of points associated with your preview:
- The ZO2 does not utilize a DSP, it is pure analog signal conditioning technology, no digital whatsoever in the signal chain.
- When adjusted to the lowest Green color setting, the ZO2 does provide a flat frequency response. The pic on our website just doesn't show that setting. We're in the process of fixing this.
- It's actually not a headphone amp with bass boost, rather it's an analog sound enhancement device that happens to have high power headphone drivers at its outputs.
Thanks much for the product preview and forthcoming review, we at digiZoid do appreciate it!