When connecting amplifiers to speakers with stranded wire, be sure to keep the esposed conductor as short as possible. Wrap the strands tightly before making connection at a terminal. This will help prevent possible short circuits that could greatly shorten the life of your amplifier. This allows the user to not only control the amplitude of each band, but also to shift the center frequency and to widen or narrow the width or coverage of the affected section of the aural spectrum.
Regulation is done by either rotary and slide controls.
Other types of parametric equalizers exist which allow control of center frequency, but not bandwidth. For rotary control units, the most common term is quasi-parametric. For units with slide controls the popular term is paragraphic. The frequency control may be continuously variable or switch selectable in steps. They may look like Drivers but they lack an active motor assembly.