What 8 letter word links column computer and stereo?

The 8-letter Word that links "column," "computer," and "stereo" is "speaker." In the context of a column, a speaker can refer to a person giving a speech or a device that produces sound. In the context of a computer, a speaker can refer to a component that emits audio output. In the context of a stereo system, a speaker is an essential component that reproduces sound.