Mackie MR8 Mk3 Active Studio Monitors:

Frequency Range: 35Hz - 20 kHz

The lowest Sine Wave Frequency I can measure, using GVST's G-Tune:

25.96Hz (G#)

The Lowest Frequency output from Monitors:

27.5Hz (A)

I cannot HEAR this frequency, but at full output volume, 27.5Hz creates vibrational stimulation of the doors & windows of my Apartment.

The most common frequency range of human hearing:

20Hz - 20kHz (but varies widely between individuals)

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