CN2938664Y - A multi-mode subwoofer - Google Patents

Abstract

The utility model provides a multi-mode super-bass sound box which adopts a structure with three chambers and double loudspeakers. Changing of the connection mode of the two loudspeakers can produce four operation modes so as to gain the frequency response of four different output sound pressures, resulting in the sound effect of four different characteristics.

Description

A multi-mode subwoofer

Technical field

The utility model relates to a novel sound box, in particular to a multi-mode subwoofer sound box capable of producing various sound effects with different characteristics.

Background technique

The progress of society makes the content related to audio equipment in our life increasingly rich, and the requirements for audio system are getting higher and higher. Different types of programs require speakers with different performance characteristics to obtain more perfect sound reproduction. Speech, drama, and music each have different requirements. Different types of music such as light music, rock music, and symphony in music have their own characteristics. It is impossible for a single speaker to complete such a variety of tasks for the large dynamic subwoofer with the shocking effect of the home theater. It is unrealistic in most cases to set several different speakers to play different sound programs, and the sound characteristics of the existing speakers cannot be changed. So, can we make a multi-mode speaker to better How about multiple different tasks?

Contents of the invention

The sound characteristics of a speaker depend largely on its low-frequency characteristics. When the sound in the mid-high frequency range remains unchanged, different sound effects can be obtained by changing the audio characteristics in the low-frequency range. The task of the utility model is to provide a multi-mode subwoofer speaker, which can realize 4 different working modes and obtain 4 different low-frequency responses, and can obtain a variety of different sound effects when working with a full-band speaker. Adapt to different usage needs.

This task is accomplished in the following way: the utility model adopts the design of a double-speaker three-chamber structure, two identical loudspeakers are installed in two identical closed cavities, and radiate sound waves to a shared open cavity, and the open cavity and sound playback The tubes form a Helmholtz resonator, which performs band-pass filtering on the sound wave and sends it to the external space to form the low-frequency sound we need. The utility model is driven by a constant-voltage output power amplifier, and four different speaker connection modes are changed to obtain four different working modes and produce four kinds of sounds with different characteristics.

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the utility model.

Fig. 2 is a schematic diagram of conversion of the speaker connection mode of the present invention.

Fig. 3 is the frequency response curves of four working modes of the present invention.

In Fig. 1, 1 and 2 are two identical loudspeakers, 3 and 4 are two identical closed cavities, 5 is an open cavity, and 6 is a sound emitting tube.

The transfer switches K1, K2, K3, and K4 in Fig. 2 are 4-knife, 4-throw transfer switches; 1 and 2 are two identical speakers respectively.

The frequency responses of the four different working modes shown in Figure 3 are curves 1, 2, 3, and 4, respectively.

Example:

One embodiment of the present utility model adopts the sound box shown in Fig. 1, selects the applicable loudspeaker reasonably and undergoes scientific design, and then changes the connection mode of the loudspeaker by means of the transfer switch shown in Fig. 2, thus forming a multi-mode ASW bandpass type subwoofer. When the transfer switches K1, K2, K3, and K4 in Figure 2 are respectively connected to contacts ①, ②, ③, and ④, the connection mode of the two speakers is changed, and four different working modes are obtained. The frequency response curves of the sound waves generated by various working modes are shown in Figure 3. The connection and frequency response of each mode are as follows:

1. When the transfer switch is connected to point ①, the two speakers 1 and 2 work in series in the same phase, the impedance is twice that of a single speaker, the output power is 1/2 of that of a single speaker, and the frequency response curve is the curve in Figure 3 1;

2. When the transfer switch is connected to point ②, only speaker 1 works, and speaker 2 becomes a passive radiator in an open circuit. Its diaphragm vibration will consume part of the sound energy generated by speaker 1. Compared with mode 1, the output sound pressure is increased but The frequency band is narrowed, and the frequency response curve is curve 2 in Figure 3;

3. When the transfer switch is connected to point ③, only speaker 1 works, and the voice coil 2 of the speaker is short-circuited to produce strong electromagnetic damping. It can only produce tiny vibrations near the equilibrium position, and only consume a very small part of the energy generated by speaker 1. The sound energy and output sound pressure are higher than that of mode 2, and the frequency response curve is curve 3 in Figure 3;

4. When the transfer switch is connected to point ④, the two speakers work in parallel with the same phase, the output power is twice that of a single speaker, the output sound pressure is the highest, and the frequency response curve is curve 4 in Figure 3.

Claims (6)

1, a kind of multi-mode subwoofer sound box, two loudspeakers are housed in three-cavity casing, it is characterized in that two loudspeakers are contained in two closed cavities respectively, and the shared open mouth is equipped with the sound-emitting tube of external opening. 2. The multi-mode subwoofer speaker according to claim 1, characterized in that the four connection modes of the two speakers can be changed by a 4-pole, 4-throw switch. 3. The first speaker connection mode of the multi-mode subwoofer speaker according to claim 2 is that two speakers work in series with the same phase. 4. The second speaker connection mode of the multi-mode subwoofer speaker according to claim 2 is that only one speaker is connected and works, and the other speaker is disconnected. 5. The third speaker connection mode of the multi-mode subwoofer speaker according to claim 2 is that only one speaker is connected and works, and the other speaker is short-circuited. 6. The fourth speaker connection mode of the multi-mode subwoofer speaker according to claim 2 is that two speakers work in parallel with the same phase.