All bulbs are prone to buzzing, not just dimmable LEDs. The tungsten filament in incandescent bulbs is known to vibrate. With LEDs, the problem comes from the rapid on-off switching used to dim the bulb, which can cause components of the bulb to vibrate. It’s at its worst when dimmable LEDs are used in incandescent dimmer switches, but it happens with LED switches, too. In fact, all dimmable LEDs vibrate to some extent, but with good ones it’s not at a level you’d notice. After testing, we found that cheap switches and bulbs are the worst culprits. The simple solution is to invest in quality. Alternatively, choose smart dimmable LEDs. They don’t rely on switch control, so they don’t have the problem.