2013. According to Bose officials, bosem2 was launched in 2013. Bosem2 uses the latest amplifier switching technology, a new patented audio design and Bose digital signal processing technology to provide accurate full-music sound effects. Although it is small, it can Provide high power output. The active electronic equalization function can adjust the balance of low, mid and high frequencies to make the sound quality clearer and more natural, delivering excellent sound effects.