Mackie's CR4.5BT Creative Reference powered studio monitors provide professional-caliber sound in a compact, Bluetooth-enabled package. Musicians can shape transparent, accurate sound for mixing or add a boomier low end and sparkling highs for casual listening and partying. With a variety of inputs and the ability to place the speakers on their sides or upright, the CR4.5BTs adapt to any workspace. Use the onboard tone control to adjust the sound, starting with the transparent quality expected from professional studio monitors then gradually boosting the lows and highs. Whether you're using them for work or play, the CR4.5BTs may be the only speakers you'll ever need.