GTT Perspective · Master Fidelity
Digital, without the digital sound.
The NADAC D is Master Fidelity's native true 1-bit converter — built around a custom ASIC, its clock architecture, and a power-reference system engineered as one problem with the conversion itself.
Why one bit, done properly
The NADAC D is built around a custom audiophile-grade ASIC and a native true one-bit architecture — a converter Master Fidelity engineered from first principles, because the conversion itself is the thing they chose to do. That decision is the foundation of everything the NADAC D does.
Master Fidelity's position is that a true 1-bit converter, given a stable clock and a thermally stable power reference, reconstructs the waveform more faithfully. In our Private Listening Room that shows up as ease — music that is resolved without being etched, relaxed without being soft.
We distribute Master Fidelity in North America because this is engineering we can stand behind and demonstrate. It is a serious, original answer to digital conversion, and it rewards a resolving system.
What the engineering actually does
A custom true 1-bit ASIC
True 1-bit decoding runs on a custom audiophile-grade ASIC of Master Fidelity's own design — silicon engineered specifically for this conversion architecture.
Clocking and thermal stability
An oven-controlled, constant-temperature power-reference system stabilizes the clock and conversion environment; USB and AES/S/PDIF use dedicated clock strategies, with Advanced Digital Domain Clock Data Recovery on the AES/S/PDIF path.
Isolation of the sensitive stages
A Super Isolation Unit and a hybrid power supply separate the noise-sensitive analog and digital sections — the analog side transformer-fed, the digital side switched and then multi-stage linear-regulated.
In our Private Listening Room
From the independent record
- Review“reconstitute digital music files in the most natural, relaxed, artifact- and distortion-free manner I've encountered” — Greg Weaver, Positive FeedbackIndependent review of the NADAC suite.
- ReviewGTT press record.
- Video“The NADAC pair provided the most realistic, natural, and lifelike sound I've ever heard from digital components in my system.” — Robert Taylor, The Absolute Sound
- Review“The Master Fidelity NADAC C and D sound just like a master tape.” — Marc Phillips, pt.AUDIO
Questions we hear in the listening room
What does a true 1-bit converter do?
It converts the bitstream directly, in a single bit, through a custom ASIC designed for exactly that task. Master Fidelity treats the conversion, the clock, and the power reference as one engineering problem rather than three separate ones.
Why the separate clock and power supply?
One-bit conversion is sensitive to timing error and supply noise. The NADAC architecture treats clocking and thermal stability as part of the converter itself — the reference is held at a constant temperature so the conversion environment does not drift.
How do I hear it at GTT?
As part of the complete NADAC front end in our Private Listening Room — the context in which its independent reviews have been conducted. Bring the recordings you know best.
Further reading
- GTT PressNADAC Suite — Positive Feedback
- GTT PressNADAC C & D — hi-fi+
- ReferenceDigital Playback & DACs
- PortfolioThe Master Fidelity Portfolio
- GTT PressNADAC C and D — The Audio Analyst
- GTT PressNADAC Digital Suite — The Audio Analyst
- GTT PressNADAC D — Your Final System
- GTT PressNADAC D and C — pt.AUDIO
- GTT PressNADAC — The Absolute Sound
- GTT PressNADAC with GTT Audio — AXPONA 2025, pt.AUDIO
- GTTA conversation with Dominique Brulhart, Weishen Xu, and Bert van der Wolf
- GTT PressNADAC D and NADAC C explained — hi-fi+
- GTTA conversation with Dr. David Robinson
Private Audition
Hear the NADAC D for yourself
GTT is the North American distributor for Master Fidelity. The NADAC D is auditioned in a complete system, by confirmed appointment, in our Private Listening Room in Long Valley, New Jersey.