The Stockwell II ($249) isn’t the loudest, the flashiest, or the toughest Bluetooth speaker. But of the 50 or so I’ve tested this year, I think it’s the best for jazz fans. Its sound has a natural balance almost unheard of in a Bluetooth speaker, and a clarity that most lack. It also has bass and treble controls, so you can get a little more Ron Carter when you want it. Despite the prominent logo on the front, the suede-backed leather strap and slim design give it a refined look appropriate to sophisticated tastes.