On this speaker, SW4 is normally open and pulls to ground when pressed, making it trivial to reuse. I cut the trace leading to the Bluetooth interface module and soldered a wire so the switch now ...

New variants in the u-blox Nora-B2 Bluetooth LE 6.0 module family integrate Nordic’s entire nRF54L series of ultra-low power ...

The white part to the left is a digital potentiometer which feeds the resistance to the original speaker PCB. On the left is the Bluetooth module which lets him control everything from his phone.

or the larger and more powerful Bose Bass Module 700, which is down to $699 from $849 for savings of $150. For those who want a new Bluetooth speaker, the cheapest option in Amazon’s Bose sale ...