UD130 Manual


Thank you for purchasing the UD130. We hope that you enjoy using it as much as we do.


The UD130 uses three input controls:

  1. Analog Volume Control
    • Clockwise increases the volume, Anti-Clockwise decreases the volume.
    • 255 steps in 0.5 dB steps, from -127.50 dB (MIN) to 0 dB (MAX).
    • While the feel is analog, the steps are entirely digital and is perfectly matched between left and right channel for the entire range.
  2. SET Button
    • Single Click Switches between LOW or HIGH Gain (or changes back to AMPLIFIER MODE from LINE OUT MODE).
    • Press and HOLD for more than 2 seconds Switches between AMPLIFIER MODE or LINE OUT MODE
    • Tip: It is recommended to use LOW GAIN unless you have managed to max out the volume and yet insufficiently loud for your hearing.
  3. USB 1 | 2
    • Toggles between USB Class 1.0 or USB Class 2.0.
    • Switch to required USB Class before connecting the UD130 to your device.

The UD130 has an output LED which indicates the following:

  • RED: LINE OUT MODE (Volume cannot be set and output is set to line out level)
  • RED, BLUE, PURPLE Flashing once in sequence (device is booting up)

Playback (PCM/DSD) Operation

For best possible PCM playback, make sure 32-bit Bit Rate is selected. Simply launch the BRAVO HD Control Panel and select 32-Bit

DSD Operation is switched automatically via the internal micro-controller.

Simply install BRAVO HD DRIVERS provided on the website and select DSD : ASIO : BRAVO HD as output device using FOOBAR. In this manner, the ASIO driver will play either PCM or DoP-64/128 depending on your source file. You will require foo_input_sacd FOOBAR component installed.

For native DSD-64/128/256 playback, dsd_transcoder FOOBAR component is required. Simply install the latest dsd_transcoder component and then select DSD : ASIO : DSD Transcoder (DoP/Native) as output device using FOOBAR.


Using the Volume Controller

Unlike conventional analog volume controllers, UD130’s volume control allows precise tuning from -127.5 dB to 0 dB in 0.5 dB steps (255 total). This allows for precise tuning from start to end and can be felt especially when using highly sensitive IEMs. Insensitive large headphones may however feel a bit more difficult to adjust (comparing to traditional analog log pots) but simply use a bit more finesses in adjustment and you will be able to reach your desired volume.