A unique no compromise design Line Stage Preamplifier to accompany and magnify
the revolutionary True 1 Bit NADAC D and unmatched precision NADAC C performances
Lossless Precision Analog Attenuator
Custom ASIC Volume Control
Based on NADAC D experience of designing and producing custom components, NADAC L features a dedicated volume control chip jointly developed with a leading semiconductor partner, using a JFET-like custom CMOS ASIC architecture. This advanced analog attenuation system delivers:
- Click noise free operation
- Channel imbalance less than 0.1dB
- Ultra-low THD+n and high SNR
- 1dB steps from 0dB to –60dB
The NADAC L exclusive chip continues Master Fidelity’s design philosophy first incarnated in the NADAC D proprietary DAC chip co-developed in-house. By designing at the silicon level, both NADAC L and NADAC D achieve performance by far beyond what standard components can offer. This integrated engineering approach is a key advantage that sets the NADAC system apart from any other high-end audio products.
True Dual-Mono Architecture
Completely isolated left and right audio channels, from power supply to signal processing. This dual-mono layout minimizes crosstalk to a negligible level, ensuring superior imaging, ultra-precise channel separation, and an incredible stable soundstage.
No-Compromise Component Selection
Similarly and to continue on the NADAC C philosophy this time, only ultra-precision 2ppm resistors are used throughout the audio signal path to maintain consistency and ultra-low noise over time. Coupling capacitors are high-quality hybrid types, chosen for their transparency and musical tonality.
Super Linear Power Supply Architecture
At the heart of the NADAC L’s power system is a custom-made toroidal transformer. Each core is hand-selected from only the highest-performing segment of premium-grade material, with each roll sufficient for just 10 NADAC L units. This is paired with:
- Ideal rectification design to minimize AC-DC conversion loss
- High-capacity, tonally-neutral capacitor arrays for ample energy reserves
- Multi-stage linear regulators that optimize both noise floor and transient response
The result is a dynamic, noise-free power delivery suitable for the most demanding musical passages.
In addition to the unique and dramatic technological assets of the NADAC L design, Master Fidelity craftsmanship DNA has been exploited to its maximum to ensure that traditional components are integrated at their best to achieve an uncompromised piece of jewelry.
High-Performance Input and Output Stages
- True differential design for all XLR inputs/outputs
- True single-ended circuitry for all RCA inputs/outputs
- High linearity current-driver output stages maintain musical integrity under all conditions
Flexible Input/Output Configuration
- 4 balanced (XLR) + 2 single-ended (RCA) inputs, with one selectable at a time
- 3 balanced (XLR) + 1 single-ended (RCA) outputs with independent control
Full Galvanic Isolation Between Analog and Control Domains
Both analog audio circuitry and digital control system are fully galvanically isolated to eliminate interference and preserve signal purity.
High-Precision Peak Level Meters
The front-panel meters offer true analog-style peak monitoring with an accuracy of ±0.05dB, providing reliable visualization of real-time audio dynamics and aiding in system tuning.
Specifications
| Typical Specification, Room Temperature, Balanced Channel | |
| Balanced Input Single-Ended Input | x4 x2 |
| Balanced Output Single-Ended Output | x3 x1 |
| Balanced Input Single-Ended Input | 10 Vrms Typical / 12 Vrms Max 5 Vrms Typical / 6 Vrms Max |
| Balanced Input Single-Ended Input | 500 kΩ 500 kΩ |
| Balanced Output Single-Ended Output | 200 Ω 100 Ω |
| Input Stage Coupling | Precision AC-Coupling |
| Input CMRR | >80 dB @ 10 Hz – 20 kHz |
| THD+n THD+n THD+n | 0.00012% @ -3dB Gain / 1kHz Tone / 10Hz–20kHz BW 0.0002% @ -20dB Gain / 1kHz Tone / 10Hz–20kHz BW 0.0008% @ -40dB Gain / 1kHz Tone / 10Hz–20kHz BW |
| SNR SNR SNR | 130dBA @ -3dB Gain REL-IN / 10Hz – 20kHz BW / A-Weight 136dBA @ -20dB Gain REL-IN / 10Hz – 20kHz BW / A-Weight 142dBA @ -40dB Gain REL-IN / 10Hz – 20kHz BW / A-Weight |
| Flatness | <±0.08dB @ 10Hz – 200kHz |
| Analog Gain | 1dB Step @ 60-Stage |
| Channel Gain Error | <0.03dB @ All Gain Stage |
| Channel Phase Error | <0.1Deg @ 10Hz – 20kHz |
| L-R Channel Separation | <130dB @ 10Hz – 20kHz |
| Input Channel Separation | <130dB @ 10Hz – 20kHz |
| Power Consumption | 16W Max / 12W Typical |
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