Studio monitors are loudspeakers specifically designed for professional audio production applications, such as recording studios, filmmaking, television studios, radio studios and project or home studios, where accurate audio reproduction is crucial. Among audio engineers, the term monitor implies that the speaker is designed to produce relatively flat (linear) phase and frequency responses. In other words, it exhibits minimal emphasis or de-emphasis of particular frequencies, the loudspeaker gives an accurate reproduction of the tonal qualities of the source audio (“uncolored” or “transparent” are synonyms), and there will be no relative phase shift of particular frequencies—meaning no distortion in sound-stage perspective for stereo recordings. In general, studio monitors use a sealed box design, without a bass reflex port or passive radiator speaker to improve the low-frequency response. Bass reflex ports or passive radiators are not used because they affect the response and sound.