ABSTRACT
Horns are used in electroacoustic systems for many reasons. Some advantages of using horns in loudspeaker systems are:
• Enhancement of electroacoustic conversion efciency • Avoidance of sound coloration due to the acoustic resonance of loudspeaker
boxes • Better control over the directivity • Reduction of transducer-generated nonlinear distortion
Horns can be considered a class of transmission line loudspeakers (or vice versa). Whereas in the conventional transmission line loudspeakers discussed in the previous chapter, there were the practical alternatives of resistance or quarter-wave transformer loading, the rst is inefcient and mainly used for mid-and high-frequency applications, the latter is used only over a narrow frequency range, usually in the low-frequency range where the long decay time of the resonant duct can be accepted from the viewpoint of hearing and room acoustics.
