I bought two SRS-XB12 louder speakers. According to the Manul, they can be used as one stereo loudspeaker, however, the connection of the Bluetooth is not stable, even though they are so close. So some times, the sound will move from left to right and then right to left.
我买了两个SRS-XB12扬声器。 根据Manul的说法，它们可以用作一个立体声扬声器，但是，即使它们之间的距离很近，蓝牙的连接也不稳定。 所以有时候，声音会从左向右移动，然后从右向左移动。