Polk Audio’s Swimmer Duo ($60) and Swimmer Jr ($40) join the company’s expanding line of low-priced Bluetooth waterproof speakers. Both plastic-and-rubber speakers have a “tail” that can be used to wrap around a bar, as would be found in the shower. Swimmer Duo is a bit larger than Swimmer Jr (2.62” in diameter vs. 2.46”), but both speakers have one 1” driver, and boast battery life up to 8 hours. Both speakers…
