The billboard had a dramatic effect on people coming within range of the cone of sound created by the directional audio speakers.

Nearby wireless devices such as cordless telephones, wireless data networks, and remote audio speakers, as well as structural features in your building, can all interfere.

Critical reviews of the new audio speakers were not favorable, and they disappeared from the market in the mid-1980s.

The convertible also featured optional headrest mounted audio speakers and a folding leather snap-fastened tonneau cover.

Riders go up and down hills many times and go through several tight turns before slowly traveling up a chainlift hill equipped with audio speakers playing bluegrass music.