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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a horn speaker showing one
embodiment of the present invention, and FIG. 2 is an axial sound pressure frequency
characteristic when the length of the horn of the horn speaker of the present invention is
changed. FIG. In the figure, 1 is a dry six-unit, 2a, 2b. 2c and 2d are horns, and A, B, C and D are
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horn speaker
having a variable output sound pressure level by changing the length of the horn. 1) Horn
speakers are characterized in that they are generally more efficient than direct radiation
speakers. However, when a speaker system is configured by combining a direct radiation type
speaker and a horn type speaker, a speaker system using a conventional horn speaker, which
often has a level matching of ISImll, can be used as a highly efficient horn speaker. A coil tap type
equal electrical attenuation circuit is inserted and attenuated. また。 === Recently, linear phase
etc. Phase matching of the speaker か l 劃 、 −1 汀 1 汀;;) f 亦 8 ml 1 Especially in the system
using a horn speaker The phase of the propagation by ff11 m1k in the horn There is a deviation,
which often causes inconvenience in the phase alignment at the crossover frequency. This device
is considered in light of the above points. The sound pressure level can be changed without using
an electric circuit as in a conventional horn speaker. Q This drawing is explained by the lower
drawing. FIG. 111 shows an embodiment of the present invention, in which 1 is a driver unit +
2m, 2b, 2e and 2d are horns, and the horn 2m is connected to the driver unit 1 by a detachable
means such as screws, and the other horn 2b. , 2c and 2d are sequentially combined by means of
horn 2 * WcH like to constitute a horn type speaker. According to this configuration, the length
of the horn can be changed. Fig. 2 shows the on-axis sound pressure frequency characteristics of
the horn type loudspeaker according to the present invention, and the characteristic A is only the
horn 2a. Property B: horns 2a and 2b, property C: horns 2 &, 2b and 2 cm and property O: horns
2S win (2)) 蓬 f 1 ε a a, 2b, 2e and 2d A, B, C, D show the sound pressure level at a fixed
distance from the horn Sekiguchi surface (one male). It can be seen that the on-axis sound
pressure level in the middle high range of the endogenous band of i increases. As described
above, the horn speaker according to the present invention can change the efficiency with a
multistage detachable i. Therefore-this consideration! In the case of constructing a speaker
system document using a horn speaker according to a proposal i, the level adjustment of the prepressure can be simplified by changing the length of the horn, and it may be as in the case of
using the conventional horn speaker Electrical circuit!
There is an advantage that it is possible to adjust the d level by changing the structure of not
only the dimensions but also the dimensions. 1ユ
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