I just paired the iFi NEO iDSD DAC/Amp with the ZEN Stream this morning. Some good news…the Stream actually does support native DSD with the NEO and, likely, all iFi DACs based on similar firmware. The impact is that I can stream my DSD256 albums to this combo without downsampling, while I was limited to DSD128 over DoP to my other DACs. The ZEN Stream still won't pass DSD512 or PCM above 384 kHz, even to the NEO. Again, this limitation seems arbitrary. Perhaps the plan is to introduce a
NEO Stream product; the ZEN limitations are there for future product differentiation. Hoping that's not the case, but iFi would not be the first company to pull stuff like this.
Compared to the Khadas Tone2 Pro, the NEO sounds a little more reserved and "British" but also slightly more tonally dense. Sub bass has a center-of-the-earth solidity that I didn't notice when I fed the NEO with my VitOS streamer. The NEO has a virtually unrivaled way of unraveling layers in recordings. Nothing in particular stands out in the mix; I just hear more of everything that's going on…all at once. NEO seems to benefit from the ZEN Stream but not to the startling degree that the Khadas Tone2 Pro did. Perhaps the reason is that I've been powering the NEO with a 5V iPower X supply while I was running the Tone2 Pro bus-powered from the Stream.
Another minor disappointment with the ZEN Stream's current Roon integration is that it does not display the signal path beyond ALSA. This is particularly noticeable when streaming MQA content. For example, here's what I see for the ZEN Stream vs. one of my VitOS streamers:
The difference is cosmetic, but I consider a $399 streamer a somewhat premium product. Hoping this is something that, like the lack of native DSD support for modern DACs, will be addressed by future firmware updates. I suspect that getting into the Linux 5.x kernel series will take care of both issues.