With the objective of developing a product that realizes the best hi-fi sound quality, enhances user convenience, has diversified connectivity, and has most functionality relative to the price while not emphasizing on a fancy exterior and demanding specifications, the development of the HUD-mx2 has been completed after a long period of time, adopting a number of high-quality components and utilizing our company’s extraordinary PCB design technology. The HUD-mx2 is capable of processing an optical input (24bits/192kHz) and a USB input (24bits/96 kHz) using only USB bus-power and enables users to enjoy audio playback that offers stronger sound output and higher sound quality by connecting the adaptor provided with the product. Moreover, users can enjoy audio playback from an iPad (with a camera kit) or a smartphone (with an OTG cable) that supports the new USB audio, etc. by connecting to them. Because it supports automatic power on/off and a power saving mode, the HUD-mx2 maximizes user convenience and power efficiency when using the product in the USB input mode.

The Finest Quality DAC with Pow- erful Dual Headphone Amplifier

HUD-mx2 presents perfection-like sound quality from DAC no one has ever experienced before, with its unique circuit organization and highest quality components. This unit supports both stereo phone jack and stereo mini jack standards without requiring a separate gender converters, while its dual headphone output provides enough driving power to be used with 600ohm headphones, providing clear and high fidelity sound.

High End Performance

Our high-end audio USB DAC provides the dramatic high quality playback, bringing out the latent possibilities of PC Audio from computer-based average audio quality to CD-quality sound through our advanced technologies.

Feature

1. Can be connected to an iPad (with a camera connection kit) or a smartphone (with an OTG cable) that supports the USB audio

2. Adopts a high purity TCXO for the clock generator in the USB controller

3. Adopts a high-performance ALPS potentiometer and the highest grade aluminum knob for the front panel volume controller

4. Adopts a high level film capacitor from WIMA in the low-pass filter area

5. Adopts total eight dedicated regulators and a number of high-performance low-ESRs and tantalum capacitors in main parts for stable and high-quality power supply.

6. Adopts high-performance solid capacitors having super low-ESR & high ripple current in the DAC’s power side

7. Adopts highest grade metal film registers from Vishay-Dale normally used for high-end audio equipments

8. Quipped with the DDC function that converts USB digital audio signals to S/PDIF (optical TX) output

9. Supports 88.2kHz signals that most USB audio DACs do not support

10. Embedded with an anti-pop circuit to eliminate unnecessary noise when the power is turned on or off

24bit/192kHz High-Quality Sound Playback

Adopting the newest Vinyl EnvyUSB 2.0 Audio Controller from VIA, high-quality sounds with a maximum 24bits/96kHz from a USB input and 24bits/192kHz from the optical input can be played back with no loss of quality from the sound sources. Additionally, with the embedded PCM1796, a high-performance DAC offering a 123dB dynamicrange from Ti, the HUD-mx2 demonstrates high-resolution sound quality and hi-fi audio quality.

Simple and Neat Overall Curve Design

Its overall smooth curve design features reverberating silver color to reflect elegant fashion, replacing previously hardened looks often found on the front panel of DAC. The design also eliminated any complicated words, making it look simple and convenient for the users to operate.

Installation of Temperature Compensated Crystal Oscillators (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.

Mounting of Highest Level Op-amp and High-performance Headphone Amplifier

Because the I/V converter and filter circuits are designed into the DAC output terminal, strictly conforming to the standard Ti design and mounting LME49860, a highest grade op-amp from National Semiconductor and OPA2227 and OPA2134 from Ti are placed at the optimum positions to produce the best sound quality, successfully realizing the high-performance and high-fidelity audio sound with the optimum balance and very low sound distortion as well as ultra-low noise. Additionally, the mounting of TPA6120A2, a high-fidelity headphone amplifier from Ti, allows users to use headphones with impedance values under 300ohms when using it in the factory default state and enjoy sounds with enough volume from the headphones with high impedance values of 600ohms after removing the gain jumpers (JP1 and JP2) inside the main body of the product. The high-quality audio signals generated through a number of highest level components can be transmitted to a speaker, an earphone or a headphone, providing users with a hi-fi level sound environment.

Embedded High-performance, Ultra-low-noise LDO Regulator and Inverter on the Power Source Side

A simultaneous supply of positive and negative voltages is necessary to activate the dual-power-type high-performance op-amp. This enables the creation of the highest level of abundant and high-density analogue signals that can be generated from hi-fi sound equipments by supplying a positive voltage to the op-amp circuits through a high-performance inverter circuit after undergoing a rectification process that converts the supplied power from the USB port or an adaptor to high and stable quality, noiseless power through a high-quality LDO regulator and a low-ESR capacitor.

Automatic Power On/Off and Power Saving Function

Because this product is designed to automatically turn the power on or off when the computer power is turned on or off or enters the power-saving mode when it is used in the USB input mode, it maximizes user convenience and the efficiency of power usage.

Supporting of USB Bus-Power

Without the adaptor, this product can be operated only with USB power in most computing environments. However according to the system when the voltage of the USB port is low, a little noise can occur. So please don't turn up the Windows Volume to the max, it is recommended to set the Windows Volume to about 80%. Also, normal operation may not be possible when using a powerless USB hub under unstable power conditions, with some notebooks, or with low-power computers. In such cases, the adaptor must be used when connecting to an iPad or a smartphone before use. Also, users who use a headphone with impedance values over 150ohms have to use the adaptor to use the HUD-mx2 to get the maximum sound output.

Installation of Protective Circuit for Speakers and Headphones

HUD-mx2 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.

Activation of the Protection Circuit When Making a Connection or Disconnection of the Adaptor

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.

88.2 kHz Support

88.2 kHz rarely supported on most of USB Audio DAC is supported in native mode. 88.2 kHz support enables a multiple up-sampling relative to 44.1kHz, which is an audio CD format.

- Installation by being downloaded with a separate driver from website enables use of Qsound (Windows XP excepted) and AC3-Passthrough function from windows, and is supported by 24bit/88.2kHz and the like.

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, HUD-mx2 automatically becomes compatible under any circumstances, guaranteeing simple operation without the need to install cumbersome drivers.

Specification

1) Interface

- USB 1.1 and USB 2.0 Full Speed compliant

- S/PDIF Optical on TOS-LINK

2) Line Out / Headphone Connectors : RCA / Stereo phone & Stereo mini

3) Resolution/Sampling rate: 16/24bit, 44.1/48.0/88.2/96.0/176.4/192.0kHz

4) Digital Out(S/PDIF): Optical

5) D/A Converter: D/A Converter

6) Headphone Impedance: 16~600ohms

7) OS: Windows XP / Vista / Windows 7 / 8, Mac OS X

8) Dimension(mm)/ Weight

Dimension : 100(W) x 120(D) x 29(H)

Weight : 260g

9) Product Content

- HUD-mx2 main body

- USB cable (USB A to B type USB cable, 1.5M)

- RCA cable (1.5M)

- User Manual (including a warranty card)

- Bumpon

- Hexagon wrench (for attaching and detaching the volume knob)

- Power adaptor (DC 12V~15V)