Originally Posted by
cplager
I think (but am not positive) that the transmitter has more to do with range than the receiving speaker.
That being said, the
solution I laid out for you above should work if you guys are close enough (and it's cheaper to try out than a tandem although a tandem is probably more fun!). If you're worried about the lag, you could always get two bluetooth transmitters and two bluetooth speakers (and then there should be no lag).
+1 Previous recommendation should work.
I have not definitively found a bluetooth device that will pair to multiple endpoints simultaneously. I have considered the above described solution for my problem as well. I was just hoping to limit the extra hardware. AND you'll need to figure out devices that are battery operated but still have reasonable range for bike separation. I'll keep looking.