Why? The manual doesn't say this explicitly, but the engineering implies it: The bass booster requires extra current. If the battery is low, the amp clips. Clipping kills speakers. Charge it to 50% before cranking the bass. The manual has a strange warning: "Volume control on the speaker is independent of phone volume."
Don't throw the manual away. Keep it in the box. Because six months from now, when the Bluetooth acts up and you’ve forgotten the button combination, you’ll be glad you did. nakamichi soundbox lite user manual
The manual is short. It takes 4 minutes to read. In those 4 minutes, you’ll learn how to double your battery life, reset a frozen unit, and activate stereo pairing. reset a frozen unit
Технологические партнеры AIDA64