In more common language, the diaphragm or cone of a driver, made of materials like paper, metal or ceramic has much higher density compared to the air that is trying to move. Looking from let's say a 8" driver's side, the load that it "sees" is the amount of air in the whole listening room. Not an easy job you would agree. In a horn the diaphragm or cone works with limited amount of air just in front of it (that's the throat of the horn) where a high pressure could be build increasing the density of air.
That would give the driver something more solid to work with. The high pressure air is then expanding as it travels down the horn till the horn's end (that's the mouth of the horn). That is the best loading for a driver. Thanks to the better coupling of the driver's cone to the air, little movement is needed to produce the same work compared to conventional designs, resulting in minimal distortion figures.
That would give the driver something more solid to work with. The high pressure air is then expanding as it travels down the horn till the horn's end (that's the mouth of the horn). That is the best loading for a driver. Thanks to the better coupling of the driver's cone to the air, little movement is needed to produce the same work compared to conventional designs, resulting in minimal distortion figures.
Horn's most famous characteristic is that of high efficiency. And it's true, as the horn has the highest ratio of converting electromechanical energy into sound pressure energy. It is the most advertised virtue of horns, but we believe the ones described below are far more important.
The high pressure build at the horns throat requires a diaphragm or cone that can withstand it without deforming in any way. Additionally a powerful motor assembly of strong magnet plus a small gap between the voice coil and the magnet are needed. Selecting the proper driver becomes a critical task and success is to be revealed amongst mediocre.
Finally the directivity of the horn would excite the first reflections of the listening room from the side walls and floor/sealing, much less than any other arrangement. That would make horns more room friendly and placement less problematic. This also doesn't come without the price of a sweet spot, in which you get the perfect imaging and maximum energy.
Finally the directivity of the horn would excite the first reflections of the listening room from the side walls and floor/sealing, much less than any other arrangement. That would make horns more room friendly and placement less problematic. This also doesn't come without the price of a sweet spot, in which you get the perfect imaging and maximum energy.
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