198Hz

198 Hz is a frequency that denotes one hundred ninety-eight sound cycles per second. It is expressed in hertz (Hz), a unit of frequency in the International System of Units. In acoustics, 198 Hz lies within the low midrange of audible sound, having characteristics similar to the musical note G3 (approximately 196 Hz) and just slightly higher. This proximity to G3 means that a 198‑Hz tone can evoke a warm, resonant timbre that is often employed in music production, especially in lower vocal ranges, bass guitar tones, and percussive elements.

From a physical perspective, 198 Hz falls well within the range that most animals, including humans, perceive as audible. The frequency can be generated by vibrating systems such as strings, air columns, and electronic oscillators. In musical tuning systems, equal temperament places the note at 198.51 Hz when the reference pitch A4 is set to 441.00 Hz, demonstrating its relevance in systems where standard pitch deviates slightly from the conventional 440‑Hz A4.

In scientific and technological contexts, 198 Hz may be used as a reference frequency in calibration of audio equipment, test signals in telecommunications, or as part of vibration analysis where specific resonant frequencies are studied. The frequency also appears in medical diagnostics, for example, as a reference tone in auditory testing to assess hearing sensitivity at low frequencies. Overall, 198 Hz is a common yet distinct frequency with applications spanning music, acoustics, physics, and engineering.