In standard form the Marantz HD-DAC1 is a terrific dac. In typical Marantz fashion it provides a great balance between detail and warmth. The analogue section already uses the superb Elna Cerafine & Silmic capacitors.
However, improvements can still be had; improving the digital section voltage regulation brings a more natural sound. Bass is warmer, and the overall tonality of instruments and voices is more realistic. We
Our Stage 1 upgrade includes:
Replacement of the main Analog power supply electrolytic capacitors to Mundorf MLytic
CS4398 Dac Regulator upgraded to SPowerD +5v
Clocking Regulator upgraded to SPowerD +3.3v
Digital Power Supply Electrolytic capacitors upgraded to Panasonic FM Low ESR