发现新买的蓝牙耳机连mac(10.12.6)声音有问题,解决方法参考了威锋的回答http://bbs.feng.com/read-htm-tid-9066819.html：
defaults write com.apple.BluetoothAudioAgent "Apple Bitpool Min (editable)" 35
defaults write com.apple.BluetoothAudioAgent "Apple Initial Bitpool Min (editable)" 53
defaults write com.apple.BluetoothAudioAgent "Apple Initial Bitpool (editable)" 35
重启电脑，蓝牙耳机声音就正常了。