I have reviewed a couple of the Zen series DAC’s and amps, if that is of any use to you.
They (the reviews) are available here on the forum but it would take me some searching to find them, so I will leave links to the same reviews on my blog:
Zen DAC Signature V2 + Zen Can HFM:
Zen One Signature (DAC)
Zen Air DAC
Zen Can Signature:
This is an extract from the Zen Can Signature review that may be of use:
"Now, all of this naming scheme can get a little confusing, I know I certainly get confused, so before moving on, let me just quickly recap what Signature devices actually exist and how to know which is which.
ZEN DAC Signature - Released in 2020 (now discontinued), this is a pure DAC that was introduced at the same time as the ZEN CAN Signature HD6XX.
ZEN CAN Signature 6XX - Released in 2020, this is an amplifier specially tuned for the Sennheiser HD6XX and can be identified by the HD6XX setting (along with XSpace) on the front.
ZEN DAC Signature V2 - Released in 2021, this is a pure DAC that upgraded the original ZEN DAC Signature. There is nothing on the front to identify this over the original ZEN DAC Signature, only the mention of V2 on the back of the device (although the original has been discontinued for quite some time, so anything in stock should e V2). I reviewed this DAC here.
*ZEN CAN Signature HFM - Released in 2021, this is an amplifier specially tuned for the Hifiman planars, it can be identified by the HFM setting (along with XSpace) on the front. I reviewed this amplifier here. *
ZEN CAN Signature MZ99 - Released in 2022 (as far as I am aware), this amplifier is tuned to be used with the Meze Classic 99 headphones. It can be identified by the MZ99 setting (along with XSpace on the front).
ZEN One Signature - Released in 2022, this model could add even more confusion to the naming scheme as there are other models in the One series that do not match with the Signature series at all. The ZEN One signature uses the same aesthetics as the signature series, and is also a pure DAC, however, the One SIgnature features Bluetooth, Optical and Coaxial Digital inputs, along with USB, whereas the other Signature DACs only feature USB inputs. However, it does lose the volume control found on the others. The ZEN One Signature is very easily recognized due to the front panel having many more features than the others. I reviewed this DAC here.
ZEN CAN Signature - Released this year, this amplifier does not aim at a specific model and, along with XSpace, it features an XBass setting on the front.
There are also other ZEN models but they do not match the aesthetics used on the Signature line, so I am not going to mention them."