The appearance of more black space in the right-hand, uncompressed portion of the audio waveform supports the expectation that average audio power is lower for that state. The software allows for selecting a portion of the waveform for statistical analysis. Here are some data for the two portions of the overall waveform:
|Minimum RMS Power:||-37.89 dB||-39.54 dB|
|Maximum RMS Power:||-10.5 dB||-11.23 dB|
|Average RMS Power:||-17.56 dB||-19.63 dB|
|Total RMS Power:||-16.48 dB||-18 dB|
The two histograms below also show the difference. The graph for compression ON (lower left) shows a greater number of samples near the high amplitude (right-hand) side of the graph, while the graph for compression OFF (upper right) shows more samples spread across the amplitude range. The X-axis of these graphs provides the amplitude scale in dB relative to some reference not explicitly stated by the program.