This graph represents the average intensity within the 20–150 Hz band. The vertical axis shows amplitude (0–255). A dot drawn near “255” indicates strong bass energy, while a dot near “0” indicates weak energy.
This heatmap displays the full frequency spectrum. The vertical axis is labeled in Hz (0 Hz at the bottom and the maximum frequency at the top). Color indicates amplitude, where cooler colors (blue) represent lower amplitude and warmer colors (red) represent higher amplitude.