The Rockford Fosgate® PerfectTune™ app is designed for use with the Rockford Fosgate DSR1 8 Channel Interactive Signal Processor with Integrated iDatalink Maestro Module. PerfectTune allows initial setup and configuration of the DSR1 and make adjustments required to tune the system for best audio performance. KEY FEATURES - Bluetooth 4.0 wireless setup and tuning - 245 total bands of equalization - Adjustable crossover (6, 12, 18, 24, 30, 36, 42, 48 dB / octave) - 31 band parametric equalization per channel - Independent level control - Time alignment - 7 band master equalization - Subwoofer level control - Punch EQ™ Note: This app is optimized for devices with screen sizes 5 inches and greater.