1. Use a 5.1 channel audio receiver:
- Connect your 2 channel audio source to the receiver's stereo inputs.
- Connect your 5.1 channel speakers to the receiver's speaker outputs.
- Set the receiver to the '5.1 channel surround sound' mode.
2. Use a sound card with 5.1 channel output:
- Connect your 2 channel audio source to the sound card's stereo inputs.
- Connect your 5.1 channel speakers to the sound card's speaker outputs.
- Use software to route the audio from the 2 channel source to the 5.1 channel speakers.
3. Use a virtual surround sound software:
- Install the software on your computer or mobile device.
- Connect your 2 channel audio source to the computer/device.
- Connect your headphones or stereo speakers to the computer/device.
- Use the software to create a virtual 5.1 channel surround sound experience.
Please note that the audio quality and accuracy of the surround sound conversion may vary depending on the method used and the quality of the source material.