NAD M51 35-bit 844kHz DAC and Digital Preamplifier with remote control, and the latest fireware. I compared it with Denafrips Ares-2 DAC using my Cyrus Smartpower amp, M51 is better in terms clearity, sound stage depth, and details. Retails price was £1500. I would think is was comparable to many hi-end DAC at £2500-3000 range. NAD simply focuses on sound quality as well as solid build. Review example: https://www.whathifi.com/nad/m51/review, Best DAC £1200+, Awards 2012. This flexible DAC will bring great results for any upmarket system. You can find much more on the internet. NAD M51 is saught after, rarely availble now in the market. It can be used as a life-time product. It is in mint condition as you can see from the pictures. It can be directly connected to a power amplifier; or can be set as fixed output feeding to a preamp. I find that the M51 is working prefectly with my Cyrus Smartpower amp driving QUAD S5 speakers, delivering really good sound, which you may need to pay much more for a high-end system to get the same. Also I tried to compare with Arcam CDS50 DAC (used as external DAC), which is already a good DAC. I could tell significant improvement of sound stage and details when using the NAD M51. The experiment really gave me a wow impression.

NAD M51 Dac In Black, Excellent Condition. Comes fully boxed with remote and power lead. No manual. The unit is in terrific condition with just a mark on the side as shown in the pictures. Unlike most similar products the m51 has HDMI inputs and outputs.