From the Audio Note website:
This is the top 2.1x DAC above the signature, so it goes 2.1x, 2.1x Signature then the 2.1x Balanced.
It has the following above and beyond the 2.1x Signature as well as being bigger with a full width case:
The DAC2.1x/II Balanced features an upgraded version of the classic Audio Note (UK) Line preamplifier output stage, using a pair of ECC82 / 5814a double triode valves. Unlike the preceding models in the Audio Note (UK) DAC range, the DAC2.1x/II Balanced features a pair of custom designed and manufactured output transformers. These devices not only have exceptionally wide frequency response, but also just about the absolutely best dynamic transfer function possible. The analogue output has provisions for both single ended and balanced operation, using the best available quality RCA and XLR connectors. To power this spectacularly revealing arrangement, we have incorporated a power supply with valve rectification. This technique not only provides excellent isolation between the digital circuitry and power supply, but also provides well isolated short and clean analogue signal paths. Internal components are of extremely high quality, as is expected from an Audio Note (UK) product.
I am looking for £2500 which is what I paid through this forum for it. I am only selling as it won’t be of any use in my new setup sadly. I have had the DAC for 4 years now and never intended on replacing it. Comes with the original box also.