Little more complex than you would think. You can purchase plate amplifiers on Parts Express or Digikey. These are like the amplifiers that come with powered subwoofers. Problem is, music is stereo and you only have one speaker which is mono. You could bridge the inputs to send both signals to one amp and just connect the speakers to one channel for a lark. The other issue is that you will have a hard time finding a plate amp with bluetooth built in, so now you have to find a bluetooth receiver that will output a line level signal to the amp and be able to control the volume. That's going to take some more research and more homework, but the two suppliers I mentioned have a huge parts inventory.