JPS5972293A - Speaker device - Google Patents

Abstract

PURPOSE:To fill up a low frequency sound about minimum resonance frequency fo and to improve conversion efficiency in a mass control area by connecting >=2 speakers which have nearly the same minimum resonance frequencies and >=50% difference in the ratio of sharpness Qo of resonace. CONSTITUTION:A speaker 13 which has small sharpness Qo of resonance, large BXl (where B is effective magnetic flux density and l is effective voice coil length in gap), and relatively small M (oscillation mass) is attached in a speaker enclosure 11. The speakers 12 and 13 have nearly equal fo values, and the impedance of the speaker 13 is less than that of the speaker 12, but is kept in the >=1/4 range of that of the speaker 12. The ratio of the sharpness Qo of those two speakers is made different by >=50%.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a speaker device attached to an enclosure.

Conventional configuration and its problems An example of a speaker device with a conventional configuration is shown in FIG. This example is a very common conventional type speaker device, in which a speaker enclosure 1 is provided with a speaker 2 and an input lead 3 connected to the speaker 2. According to the conventional configuration, in order to increase the reproduced sound pressure near the lowest resonant frequency f0, it is necessary to increase the resonance sharpness % at the lowest resonant frequency f0, but in general, to increase the % effective magnetic flux density B It is necessary to reduce the top Bxl of the effective voice coil wire length 4 in the gap, or to increase the vibrating mass M. In any case, the inertial control area (
The lowest resonant frequency f is accompanied by a decrease in conversion efficiency (output sound pressure level) in the mass control region). There is a problem in that the nearby sound pressure and the output sound pressure level are in principle incompatible, and this situation is illustrated by the change in speaker frequency response due to BXl in FIG. 2.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention specifically addresses the minimum resonant frequency f required for a beaker. The object of the present invention is to provide a speaker device that achieves two contradictory performances: enrichment of nearby bass sounds and enrichment of conversion efficiency in the mass control region.

Arrangement of the Invention To achieve the above objects, the present invention provides substantially the same lowest resonant frequency f. and the resonance sharpness Q. This is a configuration in which two or more speakers with different ratios of 50% or more are connected.

By adopting such a configuration, the lowest resonant frequency f.

In the vicinity of f, the sound pressure due to the speaker with a small resonance sharpness % accounts for most of the sound pressure of this speaker device, and the lowest resonance frequency f. Sharpness of resonance % in higher frequency mass control region
The sound pressure due to the large speakers accounts for most of the sound pressure of this speaker system. Therefore, it is possible to satisfy the contradictory demands of improving the sound pressure near the lowest resonance frequency and improving the output sound pressure level.

DESCRIPTION OF EMBODIMENTS A speaker system according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 3, the speaker enclosure 11 has a resonance sharpness Q. is small, that is, BXd is large and M is relatively small. speaker 12
and speaker 13 have almost the same f0 value, and speaker 13
Although the electrical impedance of is lower than that of speaker 12,
Set the range to ten or more of the speakers 12. Still speaker 13
The amplitude linearity of may be smaller than that of the speaker 12.

lowest resonant frequency f. The sound pressure at is proportional to the resonance sharpness Qo. and the lowest resonant frequency f. The sharpness of resonance Q at . is (ωo−2πfol RE ; electrical impedance of the speaker; RM; mechanical resistance of the speaker vibrating part). As a result, the lowest resonant frequency f. In the vicinity of , the sound pressure of the speaker 12, which has a large vibrating mass M and a small Bxl, accounts for most of the sound pressure of the speaker device of this embodiment. and generally the lowest resonant frequency f. Since the impedance at is , even if speakers 12 and 13 are connected in parallel,
Since a large amount of current flows through the speaker 12 with a small Bd, the lowest resonant frequency f. A sufficient sound pressure can be obtained at 0. Speakers 13 and 12 have resonance sharpness Qo
When the ratio of
It turned out that the effect was quite noticeable in terms of sound quality. As a result, if the resonance sharpness % differs by 60% or more, the effect of the present invention is contrary to the above, and the lowest resonance frequency f. In the higher frequency mass control region, the sound pressure is proportional to Bl and inversely proportional to the vibrating mass M. In the condensation mass control region, Bl is large and the speaker 1 with a relatively small vibration mass M
The sound pressure of 3 accounts for most of the sound pressure of the speaker device of this embodiment, and it is possible to improve the output sound pressure level. Note that if the speakers 12 and 13 are connected in parallel and the impedance of the speaker 13 is low, the effect is particularly great.

Although the embodiment of the present invention uses two speakers, the present invention has similar effects even when three or more speakers are used.

Effects of the Invention As described above, the present invention has almost the same lowest frequency,
By connecting two or more speakers whose resonance sharpness percentages differ by 50% or more, it is possible to satisfy the contradictory demands of improving the sound pressure near the lowest resonance frequency f and improving the output sound pressure level ○.

It is a diagram.

12.13...Speaker.

Claims (1)

[Claims] A speaker device in which two or more speakers are connected, each having the same lowest resonant frequency and having a resonance sharpness Qo ratio different by 60% or more.