This HIT Box Also Provides A Motor Driven Rotating Test Pad That Automatically Generates Directional Polar Plots For Fast, Accurate Testing The AVANT Polar HIT+ Performs The Following Measurements:AVANT POLAR HIT open • Directionality • OSPL 90 • Full On Gain • Reference Test Gain • Frequency Response • Equivalent Input Noise • Harmonic Distortion • Battery Drain • Input - Output • Attack / Release • Induction Coil