2.5-band loudspeakers are a specific type of component system, usually consisting of one tweeter and two mid-bass loudspeakers for each side of the vehicle. The '2.5' designation is based on the way the audio signal is divided between these speakers by means of a frequency switch, a device that filters and sends to each driver only the frequencies for which it is intended. The tweeter only plays high frequencies, i.e. tones like cymbals or hiss. One of the two mid-bass drivers plays both the midrange, such as the human voice, and the low frequencies, the bass. The other mid-bass speaker, which is the "mid-band", plays only the low frequencies and does not play the mids. In practice, this means that the two midbass drivers work together to create a stronger and fuller bass response, but only one of them is responsible for the intelligibility of the midrange. The aim of this design is to enhance the bass component of the sound compared to a standard two-band system, without the need for a full three-band system with separate bass and midrange drivers.