the world > physical sensation > hearing and noise > degree, kind, or quality of sound > unpleasant quality > mournful or plaintive sound > [noun] > howl, wail, or whine > in loudspeaker (2)
The emission of howls (howl, n. 1b) by a loudspeaker; undesirable feedback at audio frequencies in an amplifier.
A howling noise produced in a loudspeaker as a result of electrical or acoustic feedback; howling.