D/A Converter


Compatible with 32-bit/768 kHz PCM and 22.6 MHz DSD (DSD512) sound sources.
A perfectly balanced discrete non-NFB D/A converter using independent monaural modes equipped with non-oversampling mode.

Compatible with max. 32-bit/768 kHz PCM and max. 22.6 MHz DSD (DSD512) sound sources
In addition to compatibility with new high-resolution sound sources across a range of PCM and DSD formats from USB inputs, the D-1N also supports coaxial digital inputs (2 systems) and AES/EBU.

ES9038PRO, ESS' flagship 32-bit DAC, installed independently in the left and right channels
The ES9038PRO, flagship 32-bit DAC produced by ESS, is installed separately in the left and right channels through a monaural mode that achieves the world's highest specs (DNR140 dB).

An analog stage consists of perfectly balanced discrete non-NFB amplifiers

SOULNOTE's original discrete non-NFB amplifier that extends into the MHz region receives up to 120 mA from the ES9038PRO and amplifies this power for the output. The base is a perfectly balanced, non-NFB discrete circuit also used in the Phono Equalizer E-1. The voltage, current, and transistor temperature in each stage were “thoroughly investigated while listening to the sound”. As a result, the ES9038PRO has been further evolved as a dedicated amplifier. The combination of the ES9038PRO and the discrete non-NFB amplifier achieves lively music playback bursting with energy that cannot be obtained from standard OP amplifier circuits. By completely eliminating the heavy load and TIM distortion that can be a problem with normal feedback IV amplifies, the D-1N delivers energetic and soulful music playback.

A clock with ultra-low jitter crystals

Because it has the largest impact on sound quality, the clock uses ultra-low jitter crystals with phase jitter of less than 1 ps. The layout places it as close to the DAC chip as possible to create the ideal clock-wave pattern. This succeeded in obtaining a touch feeling as if cutting through the air.

A power transformer with a 260 VA large-scale toroidal transformer

The power transformer uses a 260 VA large-scale toroidal transformer. This constitutes a power amplifier class non-NFB power supply. The power supply for non-NFB discrete amplifiers, which has an exceptionally high voltage setting of ±43 V, is aused to offer playback that is both detailed in its spatial expression and filled with energy.

Direct mechanical grounding construction

Supported by three spikes, one on the front side and two on the rear side. In this way, the spike pins can be placed directly under the transformer, and mechanical grounding can be achieved to allow harmful transformer vibrations to escape directly out of the chassis.
As a result, the fuzziness of the sound caused by chassis dumps can be removed and the soul of sound can be reproduced.

Equipped with eight types of power supplies that use our original high-speed discrete regulators

The power supplies for DAC peripheral circuits are equipped with independent left and right analog- and digital power supplies, respectively. The D-1N also contains a power supply for the crystals, one for USB, one for logic, and one for the SPDIF differential receiver. These eight types of power supplies use SOULNOTE's original high-speed discrete regulators, thereby, it manages to bring out the ability of the high-voltage ES9038PRO to the limit.

NOS mode
In addition to the conventional FIR oversampling mode, the D-1N also includes a new NOS(non-oversampling) mode, which is a non-NFB version adapted to operate in the digital domain. This mode does not generate the pre- and post-echoes observed in FIR oversampling. It also suppresses extremely low noise levels with analog outputs, with no difference in levels between the two modes.
Impulse output waveform with an FIR oversampling filter (D-1N analog output)
Pre- and post-echoes are artificial "sounds" created by data calculations before and after the data is interpolated. They make waveforms like sine waves appear smoother, but calculation algorithms can affect the sound quality or ambiguity and be added to the time axis.
Impulse output waveform in NOS mode (D-1N analog output)
This waveform can only be achieved by combining a non-NFB discrete amplifier with superb transient response performance. Because music waveforms are actually a series of impulse waveforms of different heights, the NOS mode eliminates any ambiguity in the time axis information, creating more realistic and natural sound quality and an expansive listening environment to the hearing acuity of humans, which is extremely sensitive to the time axis.
* The NOS mode cannot be used with DSD.

Uses the groundbreaking Bulk Pet transfer method
USB-Audio generally transfers data using the Isochronous transfer method. The D-1N uses Bulk Pet, a new Bulk transfer method developed by Interface Corporation. This method results in reduced loads for computers and D/A converters, leading to a further dimension in playback sound quality.
* Dedicated drivers must be installed on your computer when using Bulk Pet. Download them here
* There is no need to update the firmware when using Bulk Pet with the D-1N.

Metallic insulators as standard equipment (when shipping)

Though plastic insulators are the conventional standard, metallic insulators are adopted since they promote higher sound quality. (common for all models)

Lock range switching functions to extract the best quality from connected equipment

You can choose one of four stages for the optimal lock range to match the clock accuracy of transmitting devices connected to the D-1N.

Inputs: USB (Type B), coaxial (two sets), AES/EBU (four sets)

Outputs: XLR (one set), RCA (one set)

Input format(USB)   PCM, DSD (DoP v1.1 , ASIO)
Input format(Coaxial・AES/EBU)   PCM,DSD(DoP v1.1)
Supported sampling frequency(USB)   Max.768kHz (PCM) / Max.22.6MHz (DSD)
Supported sampling frequency(Coaxial・AES/EBU)   Max.192kHz (PCM) / Max.2.8MHz (DSD64 DoP v1.1)
PCM quantization bit rate(USB)   16bit, 24bit, 32bit
PCM quantization bit rate(Coaxial・AES/EBU)   16bit, 24bit
USB profile   USB 2.0, USB Audio 2.0
Digital input   USB (Type B)、coaxial x2(SPDIF)、AES/EBU
Analog output   XLR x1、RCA x1
Analog Output level(XLR)   5.6Vrms
Analog Output level(RCA)   2.8Vrms
Frequency characteristic   2Hz to 120kHz (+0/-1dB)
S/N ratio   110dB
Total harmonic distortion   0.003%
Analog filter   Two-dimensional passive
Power voltage   220V AC 50Hz(D-1NH),115V AC 60Hz(D-1NT)
Power consumption   40W
Maximum external dimensions   Main unit: 456(W)×109(H)×379(D)mm
Weight   11kg
Included accessories   Spikes,Power cord

Rear panel

Included accessories
Spikes,Power cord

User Manual

Notes on this product

You may need to install the drivers on your computer and update the device's firmware.
Click here to download the software How to set the non-oversampling mode
Press the lock range switching button on the D-1N. Non-oversampling mode is active once the lock range LED display goes out.
With each press of the button, the lock range display LED cycles [1>>2>>3>>4>>OFF (non-oversampling mode)>>1>>2...].

Temperature settings
The circuit current in SOULNOTE products relies on solutions with the highest emphasis on sound quality and safety. Functionality and sound quality generally improve when the transistors operate at higher temperature.。

Anti-vibration housing
SOULNOTE products place the highest emphasis on sound quality, so the top cover, chassis, and other components do not employ vibration isolation.

Regarding use of electronic equipment cleaners and contact rejuvenation products on SOULNOTE products
Commercially available electronic equipment cleaners and contact rejuvenation products could damage the resin components of SOULNOTE AC inlets. Do not use these types of chemical products on SOULNOTE equipment.