Using API of APx audio test software to control and interact with APx500 Series audio analyzer, APx TTA Loudspeaker Test Utility verifies performance of micro and slim speakers to TTA standard TCB-0054(00) – TTA Verified Testing Criteria for Micro/Slim Speakers. Tests performed include Effective Frequency Range, Distortion and Sensitivity, Maximum Sound Pressure Level, and Impedance. Requirements include software option SPK-RD, IMP1 Impedance Fixture, PA, and measurement microphone.