This is the companion unit to the iFi ZEN CAN. I'm going to ship this to @ChaChaRealSmooth to get his take on it because he's heard the regular iFi ZEN DAC/amp AIO. From the sounds of it, it seems like the Signature is a more grown up version. The Drop x ZEN DAC Signature is a DAC only. There's only one day left on Drop to buy this as it's an exclusive to Drop: https://drop.com/buy/ifi-audio-zen-dac-signature-drop-exclusive Overall the sound is warm and a touch on the polite and forgiving side in the overall universe of DACs, cheap or expensive, that I have heard throughout the years. The ZEN DAC Signature is a still delta-sigma DAC, but iFi seems to go for a house sound that doesn't shear your ears of with digititus. The highs are plenty natural or as natural as can be. I'm assuming iFi is still going with the BB PCM179x series chips for this listenable quality. These chips are a bit dated. They are not the last word in microdetail compared to today's latest and greatest AKM or ESS parts. However, they don't suffer from the dreaded VELVET SOUND that every other person seems to dislike around here, or the still slightly unnatural highs of the ESS. The ZEN DAC Signature actually reminds me of iFi Nano BL's DAC section except livelier, more energetic, more balls. The Nano BL is reviewed here: https://www.superbestaudiofriends.o...ds-el-dac-ifi-nano-bl.6313/page-2#post-208350 Getting back to comparison with good AKM4493 implementations, for example the Modius, the iFi ZEN has tighter lows, more articulate transients. The Modius's bass sounds blurrier and less focused, although it's low note pitch differentiation seems to be better at times. (I play fretless bass, so I tend to pick out this pitch differentiation thing). The highs of the ZEN DAC Signature are less sharp and prickly. The soundstage is more compact all around, but also less diffuse. Modius has that power in the low and sub bass. ZEN DAC Sig is warm, punchy, and a bit more full bodied. In all, the ZEN DAC Sig, even more the unbalanced outputs, seems to be on par with the Modius using it's balanced outputs. Ultimately, they are on the same level, but different. What goes best will likely to be a matter of synergy with the other components in the chain and personal preferences. Note that I have no idea how the balanced outputs on the ZEN DAC Signature sound like because I did not have the requisite cable in time. All listening and measurements were done with the wall wart plugged in. The DAC will work with only USB power however. One thing that I know folks will ask: is there a BitPerfect switch? Unfortunately there isn't. I liked the BitPerfect mode on all of the iFi gear that's fallen into my hands. However, if I had to say, the tuning sounds like it's somewhere between the linear phase and BitPerfect modes. I think that's a good compromise that will please either camp. If there is any downside: lack of SPDIF input. I know there's a big Raspberry Pi + SPDIF / AES out contingent here. There is only one digital input via USB. BTW, no driver issues with Windows 10. Didn't even need to install a driver. The ZEN DAC Signature has both unbalanced and balanced outputs. The volume knob at the front allows for attenuation of the signal when the switch on the back it set to variable. This could be useful for IEMs which are too sensitive, assuming that your amp is of sufficiently low noise. Volume knob with variable output also works dandy if you have powered monitors. Measurements forthcoming.