TOPPING PRO / E1x2 OTG White Audio Interface

TOPPING Professional / E1x2 OTG is a 1-in, 2-out audio interface that can be connected via USB-C and can also be connected to a smartphone via external power supply.

■Audio Interface
■USB 2.0 (Type-C) Compatible
■1-in, 2-out
■Sync with PC for Optimized Smartphone Live Streaming
By connecting the E1x2 OTG to your PC and your smartphone's streaming,
you can enjoy a variety of expandable features, such as PC-based mixing and DAW-based effect application.
Clear, crisp sound and beautiful vocals create an emotionally charged live stream.

■Dual Mobile Device Live Stream
By connecting one smartphone or tablet for streaming and another smartphone to the two USB-C ports,
you can incorporate background music, instrumental sounds, sound effects, and more into your live stream, allowing for greater freedom and versatility.
Dual device synchronization unleashes the originality of your live stream, and the diverse production and live feel
enable closer communication with your listeners, creating endlessly engaging content.

■Ultralinear Microphone Preamps
The E1x2 OTG features a proprietary ultralinear microphone preamp module,
which delivers an extremely low equivalent input noise of -130.5dBu.
Even at maximum volume settings, the E1x2 OTG delivers extremely low background noise,
faithfully capturing every sonic detail in your recordings.
This ultralinear microphone preamp ensures the accuracy of the input signal,
resulting in clear, transparent sound recordings.

■48V Phantom Power, Condenser Microphone Compatible
Equipped with a 48V phantom power switch, the E1x2 OTG
can be used with condenser microphones that require external power.
And, naturally, it also supports dynamic microphones, providing unparalleled recording flexibility.

■Zero-Latency Hardware Monitoring
The zero-latency hardware design allows for comfortable real-time monitoring of plug-in effects during recording and mixdown.

■ Master your creative needs with dedicated software.

The E1x2 OTG is compatible with the dedicated driver software, ""TOPPING Professional Control Center.""

This software allows you to create templates with eight DAW channels, six loopback channels, and a mix channel, allowing you to quickly address a wide range of creative needs in recording, live streaming, mixing, and playback.

■ Supports major operating systems and high-spec audio.

The E1x2 OTG uses an excellent XMOS USB chipset and is compatible with operating systems such as Windows, Mac, iOS, and Android.

Supports high-spec audio recording and playback from 44.1kHz/24bit to 192kHz/24bit, expanding the diverse possibilities of recording and music production.

■ Three USB Type-C ports for flexible connections.

The Type-C port is used for signal transmission and power supply to smartphones and PCs, ensuring easy connection.
When using the E1x2 OTG in a desktop environment or when using 48V phantom power, we recommend connecting an external power supply to the POWER port to ensure stability and prevent signal interference.

*We recommend connecting an external power supply when connecting to a smartphone.
*Please use a cable that complies with the OTG standard when connecting to the OTG port.


- USB A to C cable
- USB C to C cable
- 6.35mm to 3.5mm adapter
- Quick start guide


● Size: 14.5cm x 12.9cm x 5.0cm
● Weight: 415g
● Power input: USB Type-C port (5V/0.8A)
● Type-C: USB 2.0 (HS), OTG: USB 2.0 (FS)
● Microphone input: 1 combo jack (with 48V phantom power switch)
● Instrument input: 1 combo jack
● Line input: 1 combo jack
● Line out: 2 x 6.35mm jacks
● Headphone output: 1 x 6.35mm jacks
● Zero-latency direct monitoring (with monitor mix knob)
● Input meter: 1 x 8 LED indicator
● Output meter: 2 x 8 LED Indicator
● Microphone Preamp Module: TOPPING Ultra Linear Module
● Headphone Amplifier Module: NFCA-LE
● OTG Technology: Digital ASRC
● Supported Sampling Rates: Type-C: 24-bit/44.1kHz-192kHz
● OTG: 16-bit-24-bit/48kHz
● Software Control: Yes (TOPPING Professional Control Center)
● DAW Channels: 8
● Loopback Channels: 6
● OS Support: Mac/Windows/iOS/Android
● Simultaneous Connection of Two Hosts: Supported
● Power Switch: Yes (on the rear panel)