Supports 32bit 384㎑, DXD/DSD native

Hi-Fi Audio Capabilities

HUD-DX1 allows its users to enjoy high-level Hi-Fi sound world by supporting replay of high-quality DSD sound source (2.8/5.6㎒) in native mode using USB bus power alone, DXD sound source (352.8/384㎑), another high-quality sound format, as well as optical input (24bit 192㎑) and MQS (Mastering Quality Sound, 96~192㎑), Hi-Fi sound source, without any loss rendered in studio recording specification. HUD-DX1 also allows its users to enjoy sounds with even higher output and high-quality sound when additionally connecting to the adaptor provided together.

Luxurious Black and Neat White color

You can meet two colors of HUD-DX1. Black color shows luxurious and stable shape
with the assembly of gold volume knob and spike, while white color shows neat and
sophisticated shape with the assembly of silver knob and spike.

DXD 32bit/384㎑
DSD Native DSD64/128

Additionally supports playback of 32-bit/384㎑
DXD sound source and optical input

Since HUD-DX1 is designed to support not only the playback of DXD sounds
in 24-bit/352.8㎑ format, but also to support optical input functions that are not
supported by products from other companies. It allows users to convert
a maximum 24-bit/192㎑ PCM digital signal into a high quality analog
sound output and play it back.

native DSD64/128

32bit/384㎑ Support

Audio Controller

ES9018K2M D/A converter

HiFi USB Audio

POP-NOISE Minimizing

Playback of Native DSD

Equipped with the newest USB 2.0 high speed audio controller from XMOS and ES9018K2M, a high performance DAC from ESS, it supports playback of Native DSD (DSD64 / DSD128) as it plays back sounds in excellent definition and Hi-Fi audio quality.

Top class OPAMP and high performance headphone amp

Adopting the MUSES series OPAMP, a top class one specifically designed for Hi-Fi audio products by NJRC, HUD-DX1 uses MUSE8920 for its I/V converter and filter circuits for excellent matching in sound quality and optimum constitution that realizes high performance and high fidelity audio with top class sound balance and very low distortion, as well as ultra-low noise. Also equipped with TPA6120A2, a high fidelity headphone amplifier from TI, it easily operates a headphone under 300 Ω in factory default mode and allows users to enjoy sounds with enough volume, even when using a 600 Ω high impedance headphone by removing jumper caps (JP1, JP2) set for headphone output gain.

The high quality analog audio signals generated through the core circuits in the high-end specification and the multiple top class analog audio components are vividly delivered to the speaker and headphone to offer top class Hi-Fi sound environment.

Installation of TCXO

TCXO is made of an extremely thin crystal, creating peculiar vibration when applied with electricity. It is often used on resonance circuit to generate uniform frequency of electronic circuits. However, frequency error in which vibration counts of TCXO vary can arise depending on outside temperature, and such appearance can become a main reason for errors or frequency distortions on precision electrical equipments. In order to reduce frequency discrepancies due to exterior temperature, TCXO uniformly maintains interior temperature within crystal oscillator and fixates the frequency, making it an essential component for audio equipments sensitive to frequencies.

Activation of the Protection Circuit

The normal procedure to use the adaptor is make a connection to the USB port after making a connection of the adaptor, but it does not go out of order if this procedure is not followed since a protective circuit is embedded. It is normal to hear a distorted sound temporarily when you connect or disconnect the adaptor during use, since the distorted sound is a phenomena occurring when the protective circuit operates.

Automatic power ON/OFF

To maximize user convenience and power efficiency, the power of this product is designed to be automatically on or off when the computer power is on or off, or when entering or releasing from the power saving mode in the case of using USB power.

LDO Regulator/Inverter circuits

To operate a high performance dual power source type OPAMP, it is required to supply positive and negative voltage at the same time. By supplying both voltages equally to the OPAMP circuit through the high performance inverter circuit after rectifying the power supplied via the USB port or an adaptor through an LDO regulator and low-ESR capacitor to obtain stable power of good quality with no noise, the rich and dense top class analog signals that can be achieved by a hi-end device can be generated.

Protective Circuit for Speakers/Headphones

HUD-DX1 incorporated protective circuit system for the speakers & headphones, preventing any potential damages by temporarily cutting-off loud signals entering the speakers & headphones during the playback, when switching Input Toggle & Off Switch.

Supports USB bus power

This product can be operated under most computing environments using USB power without connecting the adaptor. But the adaptor has to be used when using power from bus power USB hub, laptop, low power computer that have unstable power from the USB port. Make sure to use the adaptor when using an iPad or a smartphone. To use a headphone with high impedance over 150 Ω, you have to use the adaptor to obtain the maximum output.

Convenient Portability

Convenient Portability and Compatibility

Typical hi-fi DAC is inconvenient to carry around due to its large size, yet USB DAC has the advantage of being small and lightweight for the purpose of using it connected to the computer. As the unit gets smaller, the function of DAC reaches its limit and sacrifices with low quality audio sound. Our HUD-mx2 has overcome such limit to the maximum, developing ultra lightweight, compact DAC with reduced drop-off in audio quality. You can enjoy the music with highest quality possible audio sound wherever the computer is and, with its plug and play function.

Adopts genuine Thesycon driver

We adopted the driver from Thesycon, a German system software development company, by licensing to offer 100% functionality of high sound quality of Native DSD and stable audio playback. The Thesycon driver can be downloaded from the data center of the AUDINST website. Users can download it to an Internet-capable computer.

Hook-Up Application Connecting to a smart device

HUD-DX1 also supports the connection with smart devices that support USB Audio. Finally, it also maximizes user convenience and power efficiency as it supports automatic power ON/OFF and power saving mode function when used with USB input.

※ Please refer to our website for the method of connecting to a smart device.

Front Panel

① & ② Headphone/Earphone Output (6.35Ø Stereo Phone Jack / 3.5Ø Stereo Mini Jack)
③ Output Selection Switch (briefly “Output Switch”, Output Toggle Switch)
④ Input selection and off switch (briefly “Input switch”, Input toggle & off switch)
⑤ Active Indicator
⑥ Potentiometer

Rear Panel

⑦ Optical IN (S/PDIF Optical Input, Pink Shutter)
⑧ Optical OUT (S/PDIF output, Grey Shutter)
⑨ USB Port
⑩ Power Jack (DC Jack)
⑪ RCA Line Out

Minimum and Recommended System Specifications

• Intel dual-core CPU or better, or equivalent AMD CPU (quad-core CPU recommended)
• 2GB or more system memory (4GB or more recommended)
• Motherboard / laptop equipped with a USB2.0 or USB 3.0 port
• Install OS in a latest type HDD that offers a fast transmission speed (SSD recommended)
• Microsoft Windows 7 / 8 / 8.1 / 10 (64bit recommended)
• Amplifier and speaker or 2 channel active speaker / headphone / earphone
• Receiver amplifier with optical input (Not required. Applicable when using PCM optical output)

To fully utilize the performance of HUD-DX1’s USB audio, the specification of the system such as desktop PC or laptop has to be at a certain level. The level doesn’t have to be high necessarily but should not be too low.

Package contents

• HUD-DX1 main body
• USB cable (USB A to B Type, 1.5M)
• 4 spikes for fixing (to attach the main body to the floor)
• L-wrench (to attach and detach the volume knob)
• Power adaptor (DC 12V~15V)

※ RCA cable and program/driver installation CD are not provided with the product. The above product content is subject to change for the improvement of the product's functionalities.

※ The driver for Windows can be downloaded from the data center of the AUDINST website. Users can download it to a computer.


Dimensions / Weight
104(mm) x 120(mm) x 34(mm) / 300g

Headphone Output
Type : 6.35mm Stereo phone jack / 3.5mm Stereo mini 4-pole jack

Max Out Level : ±10Vpp@600Ω(When removing the gain Jumper) Max Output Power : 1.5W @ 32Ω
Output Impedance : 2Ω (Load : 16Ω ~ 600Ω)

Line Output
Type : Unbalanced RCA
Level : ±3.2Vpp max
Impedance : 200Ω

USB Audio
Type : Max 32bit 384㎑, USB 2.0 High-Speed
OS Support : Windows 7 / 8 / 8.1/ 10, Mac OS X Compatible

DSD Playback
Native DSD Support : DSD64 (2.8 ㎒) / DSD128 (5.6 ㎒)

DXD Playback
DXD Support : DXD 24bit 352.8 ㎑ ~ 32bit 384 ㎑
PCM Playback
Bit depth : 16 / 24 / 32-bit
Sample rate : 44.1, 48.0, 88.2, 96.0, 176.4, 192.0 ㎑

Digital Input / Output(PCM Only)
Type : S/PDIF Optical on TOS-LINK 44.1~192㎑
Format : IEC-60958, S/PDIF Compatible
Sample rate Detection : 44.1, 48.0, 88.2, 96.0, 176.4, 192.0 ㎑

D/A Converter
Type : 32-bit Hyperstream Reference Stereo DAC
DNR : 127㏈
THD+N : -120㏈

Operating Voltage : ±12V(with DC Adapter), ±5V(USB Bus Power)
I/V Converter : MUSES8920E (SMD x 2)
Differential Amplifier : MUSES8920 (DIP)
Line Out : MUSES8920 (DIP)
Headphone Out : TPA6120A2 (SMD)

Power Supply
DC 12V ~ 15V