Stage Right STi12 2×2 USB Audio Recording Interface User Manual

Stage Right STi12 2×2 USB Audio Recording Interface User Manual


Please read this entire manual before using this device, paying extra attention to these safety warnings and guidelines. Please keep this manual in a safe place for future reference.

  • This device is intended for indoor use only.
  • Do not expose this device to water or moisture of any kind. Do not place drinks or other containers with moisture on or near the device. If moisture does get in or on the device, immediately remove it from its power source and allow it to fully dry before reapplying power.
  • Do not touch the device or any connected cables with wet hands.
  • Do not expose this device to excessive vibration,extreme force, shock, or  fluctuations in temperature or humidity.
  • Do not expose this device to excessively high temperatures. Do not place it in, on, or near a heat source, such as a fireplace, stove, radiator, etc. Do not leave it in direct sunlight.
  • Do not place or install this device in an area where it can be exposed to excessive amounts of dust, humidity, oil, smoke, or combustible vapors.
  • Clean using a soft, dry cloth only. Do not use chemical cleaners, solvents, or detergents. For stubborn deposits, moisten the cloth with warm water.
  • This device has no user serviceable parts. Do not attempt to open, service, or modify this device.


Besides providing the hardware inputs for your microphones or instruments, audio interfaces are critical for improving the sound of your recordings. Not only will you achieve better sound, you’ll also be able to record multiple tracks at once, allowing for collaboration with others or true stereo recordings. The Stage Right™ STi12 USB AudioRecording Interface does all of the above and then some.Studio quality recording has never been as accessible.


  • 44.1kHz, 48kHz, 88.2kHz, and 96kHz sampling rates with 24-bit audio bit depth
  • Dedicated microphone input, instrument input, lineinput, and two sets of  stereo outputs
  • Built-in Analog-to-Digital Converter (ADC) with 101dB dynamic range
  • Built-in Digital-to-Analog Converter (DAC) with 105dB dynamic range
  • Powered by the USB connection to the PC
  • Compatible with PCs running Microsoft® Windows® or Apple® Mac® OS X®
  • Compatible with all popular Digital Audio Workstation software
  • Includes Kensington Security Slot™ (lock not included)


The Monoprice Customer Service department is dedicated to ensuring that your ordering, purchasing, and delivery experience is second to none. If you have any problem wit your order, please give us an opportunity to make it right.You can contact a Monoprice Customer Service representative through the Live Chat link on our website or via email at [email protected]. Check the website for support times and links.


Please take an inventory of the package contents to ensure you have all the items listed below. If anything is missing or damaged, please contact Monoprice Customer Service for a replacement.

  • 1x USB Audio Recording Interface
  • 1x USB Cable (Type-A to Type-B)
  • 1x User’s Manual


Front Panel

  1. MIC GAIN1: Controls the input volume of MIC 1 INPUT. The LED around the base of the knob illuminates when the signal is being clipped.
  2. GAIN2: Controls the input volume of INPUT2. The LED around the base of the knob illuminates when the signal is being clipped.
  3. LED: The LED illuminates when power is applied via the USB connection.
  4. MIC 1 INPUT: Combination 1/4″ TRS/XLR jack for connecting a condenser or dynamic microphone.
  5. +48V: Switches +48V phantom power on or off. Phantom power is on when the button is depressed.
  6. INPUT2: 1/4″ TRS instrument/line input for connecting an instrument level or line level device.
  7.  LINE/INST: Switches INPUT2 to accept a line level or instrument level input.
  8. DIRECT MONITOR: Switches direct monitoring on or off. When direct monitoring is on, you can hear the instrument and microphone inputs in your headphones.
  9. HEADPHONES: 1/4″ TRS jack for connecting headphones.
  10. MONITOR: Master control for adjusting the input and output monitoring levels.Rear Panel
  11. K-SLOT: Kensington Security Slot™ for use with a security lock to prevent theft. Lock not included.
  12. USB: USB connector for connecting the device to your computer using the included USB cable. The device receives all the power it needs from the USB connection.
  13. PHONE: 3.5mm TRS connector for connecting a phone, mp3 player, or other audio device using the included 3.5mm TRRS audio cable.
  14. LINE OUTPUTS: Two balanced 1/4″ TRS jacks for connecting powered speakers or an amplifier.


Perform the following steps to connect the USB Audio Recording Interface with your computer.

  1. Place the device on a flat surface near your computer.
  2. Rotate the MIC GAIN1, GAIN2, and MONITOR knobs fully counterclockwise to the minimum position.
  3. Place the +48V switch in the off position (out).
  4. Ensure that your computer is powered on.
  5. Open your web browser and navigate to Type 625909 in  the search bar, then hit ENTER. Go to the bottom of the page and  download the drivers zip file.
  6. Extract the zip file, then install the drivers for your operating system.
  7. Plug one end of the included USB cable into the USB port on the device, then plug the other end into an available USB port on your computer. The LED on the front panel will illuminate.
  8. Open your computer’s audio interface and ensure that STi12 USB is selected as the audio input and output device.

Congratulations, your USB Audio Recording Interface is installed and ready for use!


  • To prevent transient spikes from damaging your equipment, always turn the two MIC GAIN1, GAIN2,and MONITOR knobs fully counterclockwise to  the minimum position before making or breaking any connections.
  • Even if using a condenser microphone that requires +48V phantom power, ensure that the +48V switch is in the off position (out) before plugging a microphone into the MIC 1 INPUT jack. Turn on +48V phantom power only when a condenser microphone is connected.
  • The PHONE jack on the rear panel allows you to play music from a mobile device, so you can play or sing along with audio tracks for recording or practice purposes.


Monoprice is pleased to provide free, live, online technical support to assist you with any questions you may have about installation, setup, troubleshooting, or product recommendations. If you ever need assistance with your new product, please come online to talk to one of our  friendly and knowledgeable Tech Support Associates.Technical support is available through the online chat button on our website or through email by sending a message to [email protected]. Check the website for support times and links.

To download the latest drivers, firmware, manuals, etc., go to and type the P/N into the search bar. If available, support files are linked at the bottom of the product page.


Main Unit


Sampling Rates

44.1kHz, 48kHz, 88.2kHz, and 96kHz

Bit Depth

ADC Dynamic Range

101dB A-Weighted (all inputs)

ADC Chipset Dynamic Range

DAC Dynamic Range

105dB A-Weighted (all outputs)

DAC Chipset Dynamic Range

Compatible Operating Systems

Microsoft® Windows®, Apple® Mac® OS X®

Mic Input

Frequency Response

20Hz ~ 20kHz
Gain Range

0 ~ 1686mVrms


Background Noise (EIN)


Dynamic Range

Maximum Input Gain


Instrument Input

Frequency Response

20Hz ~ 20kHz
Gain Range

0 ~ 291mVrms


Background Noise (EIN)


Dynamic Range

Maximum Input Gain


Line Input

Frequency Response

20Hz ~ 20kHz
Gain Range

0 ~ 380mVrms


Background Noise (EIN)


Dynamic Range

Maximum Input Gain


Phone Input

Frequency Response

20Hz ~ 20kHz
Gain Range

0 ~ 1390mVrms


Background Noise (EIN)


Dynamic Range

Maximum Input Gain


Line Output



Background Noise

Dynamic Range



Notice for FCC

This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions:

  1. this device may not cause harmful interference, and
  2. this device must accept any interference received, including interference that may cause undesired operation.

Modifying the equipment without Monoprice’s authorization may result in the equipment no longer complying with FCC requirements for Class B digital devices.In that event, your right to use the equipment may be limited by FCC regulations, and you may be required to correct any interference to radio or television communications at your own expense.

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and receiver.
  • Connect the equipment into an outlet on a circuit different from that to which  the receiver is connected.
  • Consult the dealer or an experienced radio/TV technician for help.

Notice for Industry Canada

This Class B digital apparatus complies with Canadian ICES003.

Monoprice™, Stage Right™, the Stage Right logo, and all Monoprice logos are trademarks of Monoprice Inc.

Microsoft® and Windows® are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.

Apple®, Mac®, and OS X® are trademarks of Apple Inc., registered in the U.S. and other countries.

Kensington® is a registered trademark of ACCO Brands Corporation. Kensington Security Slot™ is a trademark of Kensington Computer Products Group



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