TOPPING E1x2 OTG USB Audio Interface
Model: TPP30D V1.0
Overview
The TOPPING E1x2 OTG is a versatile USB audio interface designed for professional audio applications, offering high-quality sound input and output for recording, monitoring, and playback.
Contents List
- E1x2 OTG Host
- Type A to Type C cable
- Type C to Type C cable
- 6.35 mm to 3.5 mm adaptor
- Quick Start Guide
Product Attributes
| Attribute | Details |
|---|---|
| Measured | 14.5cm x 12.9cm x 5.0cm (Includes protruding parts) |
| Weight | 415g |
| Power Input | USB TypeC port (DC5V/0.8A) |
| USB Protocol | TypeC: USB2.0 (HS) OTG: USB2.0 (FS) |
| Microphone Input | 1x Combo connector (Equipped with 48V phantom power switches) |
| Instrument Input | 1x Combo connector |
| Line Input | 1x Combo connector |
| Line Output | 2x |
| Headphone Output | 1x |
| Zero-latency direct monitoring | Yes (Equipped with monitor mix knob) |
| Input meter | Yes (1x8 LED indicators) |
| Output meter | Yes (1x8 LED indicators) |
| Mic pre modules | Ultra-linear |
| Headphone amp modules | NFCA-LE |
| OTG technology | Digital ASRC |
| Supported sampling rates | TypeC: 24bit/44.1kHz-24bit/192kHz OTG: 16bit/48kHz-24bit/48kHz |
| Software Control | Yes (TOPPING Professional Control Center) |
| DAW channels | 8x |
| Loopback channels | 6x |
| OS support | Mac/Win/iOS/Android |
| Two hosts simultaneous connection | Support |
| Power switch | Yes |
Parts and Names
Front Panel
The front panel of the E1x2 OTG features various controls and indicators for audio input, output, and monitoring.
The front panel is organized with input connections and controls on the left, indicators and main output controls in the center, and headphone output on the right. Key controls include:
- 1. IN: XLR and 6.35mm (TRS/TS) combo jack for microphone, instrument, or line-level devices.
- 2. INST: Switch for Line/Instrument input. Light off for Line, light on for Instrument.
- 3. 48V: Phantom power switch for microphone inputs. Light on enables 48V phantom power for XLR input. Caution: Use only for condenser microphones; turn off when not needed. Lower volume before switching.
- 4. Input gain knob: Adjusts the gain level for input signals. Rotate clockwise to increase, counterclockwise to decrease. Monitor CLIP indicator.
- 5. MON: Direct monitoring switch. Enables zero-latency monitoring by routing input signals directly to the headphone output.
- 6. LED Meters: Input (IN1) and Output (OUT1&2) level indicators. CLIP lights up when signal is clipping.
- 7. Power indicator: Solid light for working, off for power off, breathing light for standby.
- 8. OTG indicator: Solid light indicates OTG device connected, off means no device connected.
- 9. Input monitor mix knob: Adjusts the balance between live input signal and computer playback signal for monitoring.
- 10. Headphone volume control: Adjusts the volume level for the headphone output.
- 11. 6.35mm headphone output jack: For connecting headphones.
- 12. GAIN: Headphone amplifier gain setting. Light off for low gain, light on for high gain.
- 13. MONITOR: Controls the output level for the LINE OUT to speakers.
Rear Panel
The rear panel provides the main connectivity ports for the audio interface.
The rear panel features:
- 14. LINE OUT: 6.35mm TRS balanced jacks for connecting to active speakers or amplifiers.
- 15. OTG: USB-C port for connecting mobile devices (phones, tablets) for recording or playback.
- 16. USB-C: USB-C port for connecting to a computer for data transfer and power.
- 17. POWER: DC5V power input for additional power when needed, especially with mobile devices. When used, the adjacent USB-C port is for data only.
- 18. Power switch: Main power toggle.
Connection diagrams illustrate XLR, TRS, and TS input types with their respective pinouts (GND, +, -).
Factory Reset
To restore factory settings, press and hold the MON button on the front panel while powering on the device until all meter indicators light up.
Connection
Ensure all volume levels are set to minimum before connecting or disconnecting external devices to prevent hearing damage or equipment malfunction.
USB Mode Setting
The E1x2 OTG can connect to PCs or mobile devices via the USB-C port. To set the mode:
- Press and hold the 48V button on the front panel while powering on the device.
- Press the 48V button again to switch modes: 8 lights indicate PC mode, 4 lights indicate mobile mode.
- Power off and reboot to save the setting.
TOPPING Professional Control Center
Download the detailed reference guide for the TOPPING Professional Control Center from: https://www.topping.pro/downloads/TOPPING Professional Control Reference Guide.pdf
DAW Audio Setup
The E1x2 OTG is compatible with DAWs supporting Core Audio (Mac) or ASIO (Windows). Ensure the E1x2 OTG is selected as the audio driver in your DAW's preferences. Refer to your DAW's user guide for specific instructions.
Troubleshooting
No Power
- Check if the rear panel power switch is ON.
- Connect the DC5V power supply if power is insufficient.
- Verify the USB cable is not broken or damaged; use a cable no longer than 2 meters.
- Try different USB ports on your computer.
- Test with another computer if possible.
Playback Sound Cannot Be Heard
- Check speaker connections and volume settings.
- Adjust E1x2 OTG Line Output and headphone volume.
- Check Topping Pro settings.
- Connect directly to the computer without a USB hub.
- Disconnect unused USB devices.
- Quit unused applications.
Recorded Audio is Too Loud, Too Quiet, or Silent
- Adjust the E1x2 OTG input gain knob.
- Ensure 48V phantom power is ON if using a condenser microphone.
- Check Topping Pro settings.
Sound Breaks Up
- Increase buffer size (latency) in the audio application or Topping Pro (Windows only).
- Test with another computer if possible.
The Sound of the Device Connected to the Input Jack is Distorted
- Monitor the input meter and reduce input gain if the CLIP indicator is on.
Cannot Play or Record
- Confirm E1x2 OTG is set as input/output device in your software.
- Ensure E1x2 OTG is connected correctly to the computer.
- Quit all software using E1x2 OTG, unplug and re-plug the USB cable.
The Mobile Phone Does Not Recognize This Unit
- Enable OTG function on some Android phones.
- Ensure the USB cable supports OTG function.
- Connect DC5V power supply if power is insufficient.
- Set the unit to mobile mode if the phone is connected to the USB-C port.
Specifications
Microphone Input
| Parameter | Value |
|---|---|
| Equivalent Input Noise @A-wt, 150 Ohm | -130.5dBu |
| THD+N @A-wt | -110dB (0.0003%) |
| Dynamic Range @A-wt | 118dB |
| SNR @A-wt | 118dB |
| Crosstalk @1kHz | / |
| Frequency Response | 20Hz-40kHz (±0.2dB) |
| Maximum Input Level | 8.6dBu |
| Input Impedance | 1.5K Ohms |
| Available Gain | 58dB + 20dB (20dB digital gain) |
| Phantom Power | 48V |
| Connector Type | XLR connector of the combo socket |
Instrument Input
| Parameter | Value |
|---|---|
| THD+N @A-wt | -108dB (0.0004%) |
| Dynamic Range @A-wt | 118dB |
| SNR @A-wt | 118dB |
| Crosstalk @1kHz | / |
| Frequency Response | 20Hz-40kHz (±0.3dB) |
| Maximum Input Level | 14.8dBu |
| Input Impedance | 1M Ohms |
| Available Gain | 58dB + 20dB (20dB digital gain) |
| Connector Type | TS connector of the combo socket |
Line Input
| Parameter | Value |
|---|---|
| THD+N @A-wt | -107dB (0.00045%) |
| Dynamic Range @A-wt | 118dB |
| SNR @A-wt | 118dB |
| Crosstalk @1kHz | / |
| Frequency Response | 20Hz-40kHz (±0.1dB) |
| Maximum Input Level | 23.9dBu |
| Input Impedance | 9K Ohms |
| Available Gain | 58dB + 20dB (20dB digital gain) |
| Connector Type | TRS connector of the combo socket |
Line Output
| Parameter | Value |
|---|---|
| THD+N @A-wt | -100dB (0.001%) |
| Dynamic Range @A-wt | 115dB |
| Analogue Dynamic Range @ A-wt, -40dB attenuation | 127dB |
| SNR @A-wt | 115dB |
| Crosstalk @1kHz | -128dB |
| Frequency Response | 20Hz-40kHz (±0.3dB) |
| Maximum Input Level | 14dBu |
| Noise @A-wt | 1.8uVrms |
| Output Impedance | 100 Ohms |
| Connector Type | 6.35mm TRS balanced jack |
Headphone Output
| Parameter | Value |
|---|---|
| THD+N @A-wt | -100dB (0.001%) |
| Dynamic Range @A-wt | 115dB |
| Analogue Dynamic Range @ A-wt, -40dB attenuation | 132dB |
| SNR @A-wt | 115dB |
| Crosstalk @1kHz | -120dB |
| Frequency Response | 20Hz-40kHz (±0.3dB) |
| Maximum Input Level | 0dBu @ Gain=L 17dBu @ Gain=H |
| Noise @A-wt | 1 uVrms |
| Output Impedance | 1 Ohms |
| Connector Type | 6.35mm stereo headphone jack |
| Output Power | 580mW x 2 @32Ω THD+N<1% 380mW x 2 @640 THD+N<1% 198mW x 2@150Ω THD+N<1% 105mW x 2 @300Ω THD+N<1% 55mW x 2 @600Ω THD+N<1% |
OTG Output
| Parameter | Value |
|---|---|
| OTG Output (@OTG 24bits/48kHz <-> TypeC 24bits/44.1kHz-192kHz) | |
| THD+N @A-wt | -130dB (0.00003%) |
| Dynamic Range @A-wt | 138dB |
| SNR @A-wt | 138dB |
| Crosstalk @1kHz | -154dB |
| Frequency Response | 20Hz-40kHz (±0.1dB) |
| Maximum Input Level | -0.5dBFS |
| Connector Type | OTG (TypeC) |
*Note: The above data is the result of the test in TOPPING laboratory.
