So you have inserted your Minirig Subwoofer charger cable into the Minirig Subwoofer and connected it to a USB power supply. The LED is flashing to show it is charging, but the colour is not changing.
- Check the USB power supply has a good current rating above 1A
- Your USB port may not be able to provide much power, try a different USB port
- Keep leaving the Minirig Subwoofer on charge. It may take a long time to charge if the USB port has a low power rating