Mackie's CR5BT Creative Reference studio monitors deliver professional-quality sound for any space. Featuring a variety of inputs, including Bluetooth connectivity, these speakers provide transparent sound ideal for studio work or casual listening. A tone knob allows you to adjust the sound to your preference, starting with the accurate, uncolored reproduction expected of studio monitors before boosting the bass and highs for more excitement. Whether creating music, enjoying media or both, the Mackie CR5BT powered monitors may be the only speakers you'll ever need.r is required.