Product Code PM132
Dimensions Plug length: 52mm ± 0.5mm
Plug diameter: 3.5mm
Conductors 3.5 MM Stereo Plug 4x Conductors
TRRS Connector CTIA Standard connector
Sheath Material: PVC
Colour: Black
Tools Test Software: BurnInTest
Available Tests: Sound Test
Test Software: OboeTester
Available Tests: Round-trip audio latency and glitch test


These loopback plugs connect to the Audio Port of your Windows PC or Android Device. If your device does not have an audio port, the Audio Loopback plug also functions with a USB-C audio adapter (this is not included).

Circuit Layout

Audio Loopback Plug Circuit

Software Compatability

PassMark Software

BurnInTest: Utilizing the Sound Test in BurnInTest, the loopback plug can be used to measure the distortion between audio input and audio output.

3rd Party Software: OboeTester

Option 1: Download OboeTester directly from the Google Play Store

Option 2: Run OboeTester via Android Studio


System Requirements

  • 4 GB RAM minimum, 8 GB RAM recommended
  • 2 GB of available disk space minimum, 4 GB Recommended
  • 1280 x 800 minimum screen resolution

Build and Run

  1. Launch Android Studio
  2. Click Open from the File menu and browse to the "oboe/apps/OboeTester" folder. Select that folder.
  3. Wait about a minute for the project to load.
  4. Connect an Android phone to your computer using a USB cable and connect Audio Loopback Plug to Audio Port.
  5. Look at your phone. You may need to give permission to use ADB on your phone.
  6. Select "Run App" from the "Run" menu.
  7. OboeTester should build and then appear on your computer.
  8. Complete your testing using the Round Trip Latency and Glitch Tests

Update the NDK (Side by Side) under SDK Tools in Android Studio

Additional Resources

Further information on how to use OboeTester's various test activities can be found on GitHub.