"To measure is to know"
Audio Precision has written a utility that allows APx to control a the Active LoadBox dynamic load tester, for a real-world view of your power amplifier designs.
Audio Precision’s Active LoadBox Utility integrates AudioGraph’s Active LoadBox with APx, providing automated and comprehensive resistive and reactive load measurements
Swedish company AudioGraph, the home of the PowerCube, continues to develop measurement tools for the audio industry. AudioGraph created the de-facto business standard 3-D measurement graphs – easy-to-read yet very powerful.
Located in Linköping, Sweden, we continue todevelop tools for the audio industry.
To read the graph, note that the results in the center are purely resistive, with higher impedances in the back and lower impedances in the front. Moving to the left of center adds capacitance (current leads voltage by 30° and 60° @ 1 kHz), and moving to the right adds inductance (current lags voltage by 30° and 60° @ 1 kHz). Because actual speaker impedance can vary greatly from the nominal rating, it’s important to observe the results over the entire graph.