Other things to try:

- Make sure the analog cable is not plugged in.

- Unplug the USB, turn it off, unplug the brick for 10 seconds and then turn it on again. If the LED is blinking, it's a firmware initialization problem. If the LED stays on, plug in the USB. If the LED now starts blinking, it's a comms problem.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated