Can I pair 2 of the 512 speakers together as a left and right stereo setup with 1 source?

The 512 is not designed to function as a pair, however, depending on what source you use this may be possible! We have tested pairing some Android phones  with 2 of the 512s by selecting “dual audio” in the Bluetooth settings on the phone. Some phones/sources will allow you to connect to multiple Bluetooth devices at once by doing this.