4.1

About the 4.1

The Audio Note Kits (ANK) DAC 4.1 is a DIY, non-oversampling digital-to-analog converter based on an AD1865 R-2R converter and CS8414 digital receiver. It uses transformer-coupled digital isolation and analog conversion, a tube-buffered output stage, and a tube-rectified and tube-regulated power supply. The design is associated with Audio Note’s DAC 4.1/4.1X platform and was offered with high-grade components, triple C-core output transformers, RCA and balanced XLR outputs, and optional or included USB input depending on the version. Available documentation describes multiple component-level editions, so exact tube complement, transformer implementation, USB availability, and component brands may vary by production run and kit configuration.