EQ Bars is an Audio Spectrum Analyzer App. It analyzes sound from the built in microphone, or from an attached external microphone, and displays he spectrum analysis. Frequencies range from 0 hertz to 22000 Hertz or 22K, this is the range of thebuilt-in microphone, and also the general range of human hearing.HIGH PERFORMANCE EQUALIZER? Highly optimized equalizing algorithm. Uses much less battery than other EQ apps with comparable algorithm.? High quality equalization without distortion. Uses 32-bit float processing, the industry standard in digital sound processing.? Draw EQ curves without limitation or distortion? Realtime spectrum output