Introduction
The two cone-shaped drivers on the Polk Omni S2 are primarily responsible for making sound. If the speaker's output is quieter, pop off the grille and look at the drivers — if one of them is not moving when playing sound, then it is likely broken and needs to be replaced.
This guide is for the left driver (when looking at the front of the device).
What you need
Conclusion
To reassemble your device, follow these instructions in reverse order.