Ensure that only one voice chat application is in use while in-game. Be sure you hear a click when the microphone is flipped down. The microphone will only function when it is flipped down fully. If you see a red LED on the microphone, it is muted.

Check that the PC is using the correct recording device.

1. Go to Control Panel

2. Select  Sound 

3 Select  Recording

4. Make sure to select the proper recording device.

1. Right-click on it Quantum headset.
2. Now select "Set Default Device" or "Select Default Communication Device"

5. Check the microphone levels by right-click on your Quantum headset.

6. Go to Properties

7. Chose Levels and adjust accordingly