Yes, I have a pure ii. It's gain adjustable to lower gain as I have CIEMs. It's a huge improvement compared to internal amp on the DX90 and other DAPs. It's the best portable amp I've heard, it does well with anything. Do a search in the pure ii thread, DX90 and X5 threads, you will run into impressions.
thanks silverears.
I have a headstage 3g and wonder if the bass bost is better or similar (0dB, 9dB, 12dB on the g3) on the Vorzüge amps...