Sound Pressure Level Pillows

Description: A monochrome diagram displaying multiple Phon curves with labeled decibel sound pressure levels (dB SPL) on the y-axis and frequency in Hertz (Hz) on the x-axis. The graph features a barred frequency response with various curved lines representing different phon levels, such as 120, 960, 180, 900, and several instances of 'Phon'.

Description: A monochrome graph displays multiple wave-like lines representing "Loudness (n Phones)" plotted against "Sound Pressure Level in dB SPL". The background is black, and the lines are white with dashed horizontal grid lines. A zero point is marked on the y-axis.

Description: A monochrome graph with a black background and white grid lines. It displays multiple white curves representing sound pressure levels across varying frequencies. The Y-axis is labeled 'Sound Pressure Level' and the X-axis is labeled 'Frequency'. Numerical markers are present on both axes.

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