349Hz

349Hz is a frequency measured in hertz (Hz), where one hertz equals one cycle per second. It is commonly associated with the musical note F4 in standard equal temperament tuning, whose standard frequency is 349.23 Hz. In musical contexts, 349Hz is frequently used as a reference pitch for tuning instruments, especially by musicians who use tuning forks or electronic tuning devices that output this exact frequency.

In audio engineering, 349Hz may appear as a test tone for evaluating frequency response and calibration of audio equipment. Engineers and sound technicians sometimes use pure sine waves at 349Hz, alongside other well‑known frequencies such as 500Hz and 1000Hz, to assess the fidelity of loudspeakers, headphones, and microphones across mid‑range frequencies.

The 349Hz frequency is also occasionally employed in therapeutic or diagnostic settings. For example, low‑frequency electrical stimulation protocols use this frequency for specific types of muscle or nerve stimulation because it falls within a range that can comfortably penetrate bodily tissues without causing discomfort or harm.

Despite its specialized uses, 349Hz does not have the same widespread cultural significance as the 440Hz tuning frequency for A4. However, it remains an important technical reference point in both music and acoustics, providing a standard for precise measurement, equipment calibration, and the creation of accurate, high‑fidelity audio reproduction.