PRO USB is a passive DI box specially designed for mobile devices. It is compatible with Windows, Mac OSX, iOS and Android systems. It does not require any drivers to achieve plug and play. It can be used as a signal impedance matcher for mobile devices and built-in headphone amplifier and volume control.
 
PRO USB is the first to use TYPE-C as the terminal to connect to mobile phone and computer.
 
The USB audio decoder combines Com True CT-7601SR and Cirrus Logic CS-43131 to achieve 192KHz/32bit performance, and are compatible with DSD digital formats and all common lossless and compressed music formats.
 
The PRO USB has a pair of built-in UNiKA-PROTM EI9AE3R3 1.25:1 isolation transformer for each channel isolation transformers. The transformer has a special copper foil layer and a dedicated grounding layer, which can ensure the high signal/noise ratio and dynamic sound of the device, and avoid unnecessary Leakage caused by radio frequency interference, grounding interference and potential difference. PRO USB is especially suitable for mobile phone, computer and media player. It converts high-impedance signals into low-impedance balanced signals, which is convenient for extending the wiring distance and blocking interference.
 
PRO USB has built-in mini TRS headphone monitor output and monitor volume control, which can drive 16Ω~600Ω headphones.
 
Key Features

• Built-in UNiKA-PROTM EI9AE3R3 1.25:1 isolation transformer for each channel

• Built-in CT7601 USB bridge and CS43131 DAC with headphone amplifier

• 32bit convert rate and 192KHz over sampling

• Compatible with Windows, Mac OS, iOS and Android systems.

• Compatible with DSD digital formats and all common lossless and compressed music formats.

• Mini TRS jack used to connect earphone or headphone with volume control

• Built-in Type-C USB digital audio input connector

• The output is equipped with a GND/LIFT switch