The Mackie SRT215 Professional Powered Bluetooth Loudspeaker is built for bands, DJs, singer/songwriters and venues who need clear, powerful sound with minimal setup time. And it needs to keep up with all the punchy low end, clear vocals, and clean highs that you need to sound great. Need to shake the walls? It can do that too. The Mackie SRT215 15-inch powered speakers perfect for use as a drum monitor, FOH speaker or any other application requiring dependable, full-spectrum audio.