Loudspeakers and room interaction inevitably introduce unwanted coloration to sound during playback – colorations which are sometimes either difficult or impossible to remove with traditional electronics or room treatments. The free EZ Set EQ app provides easy-to-use room equalization for optimized sound quality. For best results, we recommend using a Dayton Audio iMM-6C USB-C microphone. Compatible with all models of JBL MA series AV Receivers. Note: For the best experience, please check your AVR is running the latest firmware.