CN2774058Y - Six-order bandpass speaker system with passive radiator - Google Patents

Abstract

The utility model relates to a six-order band pass speaker system with passive radiators, which comprises a front resonance box, a back resonance box and an active speaker. The utility model is characterized in that passive radiators are arranged on the front and the back parts of the resonance boxes, the passive radiators are hermetically fixed on the front and the back resonance boxes, and the passive radiators and the front and the back resonance boxes are formed into a sealed whole. The utility model having large radiation area reduces the velocity of air vibration under the condition of the same output sound pressure, and the phenomenon of low-frequency radiating distortion is improved; the passive radiators are used for separating the resonance boxes from outside air, the influence of the normal mode of sound waves in the resonance box on the sound radiation of the system is effectively restrained, and the non-linear distortion of the system is effectively reduced.

Description

Six rank band-pass loudspeaker systems with passive radiator

Technical field

The utility model relates to a kind of speaker system that can carry out electric energy and acoustic energy conversion, exactly, relates to a kind of novel six rank band-pass loudspeaker systems that utilize the auxiliary low frequency radiation of passive radiator.

Background technology

Tradition six rank band general formula speaker system (seeing accompanying drawing 1) are by the active loud speaker, resonance box, and forward and backward phase-reversing tube three parts are formed.After the vibrating diaphragm of loud speaker is driven, produce vibration and by with resonance box in the coupling of air, make air generation vibration in the resonance box, the coupling of air and phase-reversing tube is to the space radiation sound wave in the case, forward and backward phase-reversing tube is the sound wave of radiation different frequency range, out of phase respectively, both superpose and realize the filtering of high and low frequency sound wave, thereby realize six rank band-pass responses.Its acoustic analog line map as shown in Figure 2, in the accompanying drawing 2, Pg is the equivalent sound potential source, Ma is the equivalent sound quality of active loud speaker, and Ca is that the equivalent sound of initiatively loud speaker is suitable, and Ra is the equivalent acoustic resistance of active loud speaker, Cb1 is that the equivalent sound of preceding resonance box is suitable, Mp1 is the equivalent sound quality of preceding phase-reversing tube, and Cb2 is that the equivalent sound of back resonance box is suitable, and Mp2 is the equivalent sound quality of back phase-reversing tube.The sound radiation pressure frequency response function that can obtain this system according to the analogy line map is:

$P_v=\frac{\mathrm{\&rho;f}}{2r}|U_{p1}-{\mathrm{<figure-callout\; id="2"\; label="U\; p"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">U</figure-callout>}}_p|=\frac{\mathrm{\&rho;}{P}_g}{4\mathrm{\&pi;r}{M}_a}\left|G_v\left(\mathrm{jw}\right)\right|$ LLLLLG _v(jw) be system function

$G_v\left(\mathrm{jw}\right)=\frac{\frac{{\left(\mathrm{jw}\right)}^4}{{W_s}^2}(\frac{1}{{W_{p1}}^2}-\frac{1}{{{\mathrm{<figure-callout\; id="2"\; label="W\; p"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_p}^2})}{\left[\begin{array}{c}1+\frac{\mathrm{jw}}{W_s{Q}_t}+{\left(\mathrm{jw}\right)}^2(\frac{1}{{{\mathrm{<figure-callout\; id="2"\; label="W\; s"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_s}^2}+\frac{1+\mathrm{\&alpha;}}{{W_{p1}}^2}+\frac{1+\mathrm{\&beta;}}{{{\mathrm{<figure-callout\; id="2"\; label="W\; p"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_p}^2})+\frac{{\left(\mathrm{jw}\right)}^3}{W_s{Q}_t}(\frac{1}{{W_{p1}}^2}+\frac{1}{{{\mathrm{<figure-callout\; id="2"\; label="W\; p"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_p}^2})+{\left(\mathrm{jw}\right)}^4(\frac{1}{{W_{p1}}^2{{\mathrm{<figure-callout\; id="2"\; label="W\; s"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_s}^2}+\frac{1}{{{\mathrm{<figure-callout\; id="2"\; label="W\; p"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_p}^2{{\mathrm{<figure-callout\; id="2"\; label="W\; s"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_s}^2}+\frac{1+\mathrm{\&alpha;}+\mathrm{\&beta;}}{{W_{p1}}^2{{\mathrm{<figure-callout\; id="2"\; label="W\; p"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_p}^2})\\ +\frac{{\left(\mathrm{jw}\right)}^2}{{{\mathrm{<figure-callout\; id="2"\; label="W\; p"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_p}^2{W_{p1}}^2{W}_s{Q}_t}+\frac{{\left(\mathrm{jw}\right)}^6}{{{\mathrm{<figure-callout\; id="2"\; label="W\; p"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_p}^2{W_{p1}}^2{{\mathrm{<figure-callout\; id="2"\; label="W\; s"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_s}^2}\end{array}\right]}$

Wherein: $\frac{C_a}{C_{b1}}=\mathrm{\&alpha;};\frac{C_a}{{\mathrm{<figure-callout\; id="2"\; label="C\; b"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">C</figure-callout>}}_b}=\mathrm{\&beta;};$ $W_{p1}=\frac{1}{\sqrt{M_{p1}{C}_{b1}}};$ ${\mathrm{<figure-callout\; id="2"\; label="W\; p"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">W</figure-callout>}}_p=\frac{1}{\sqrt{M_{p2}{\mathrm{<figure-callout\; id="2"\; label="C\; b"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">C</figure-callout>}}_b}};$ $W_s=\frac{1}{\sqrt{M_a{C}_a}};$ $Q_t=\frac{W_s{M}_a}{R_a}$

According to the system function choose relevant parameter, the response characteristic that can obtain expecting just, as can be seen for given speaker system, tuned frequency FB is certain, the volume of resonance box also is certain, by following formula:

$F_B=1/2\mathrm{\&pi;}\sqrt{M_p{C}_b}$ ----------Mp is the phase-reversing tube acoustic mass, and Cb is that the resonance box equivalent sound is suitable

M _p=ρ L/S _p-------------L is a phase-reversing tube length, and Sp is a phase-reversing tube equivalence swept area

P=(ρ f/2r) U _p------------P is a sound radiation pressure, and Up is a volume of air speed

U _p=V _pS _p--------------Vp is the air velocity in the pipe

As can be seen, improve the systems radiate acoustic pressure, then must guarantee the volume of air speed transmitted in the pipe, the product of the sectional area of inner air tube vibration velocity and phase-reversing tube is a volume of air speed.Because the span of the sectional area of phase-reversing tube has bigger limitation (common effective radiating area much smaller than the active loud speaker), causes the air vibration speed in the phase-reversing tube very high, inevitably brings the windage noise; Therefore we do not wish that air vibration speed is too big; the opposite low air vibration velocity of situation decline of wishing in the output of assurance acoustic pressure; thereby reduction low-frequency distortion; so then must increase the phase-reversing tube size; then will inevitably cause tube length to become very long; the length and the area of pipe are inversely proportional to, this structurally regular meeting run into certain difficulty (especially obvious in the small size loudspeaker enclosure).On the other hand, this System cabine inner air and outer air directly is communicated with by phase-reversing tube, so the influence of normal-mode is inevitable in the case, shows that the nonlinear distortion of system is bigger.

Summary of the invention

The purpose of this utility model provides a kind of six rank band-pass loudspeaker systems with passive radiator, and this system utilizes passive radiator to replace phase-reversing tube in traditional six rank bandpass systems, excellent performance, low low distortion, and install convenient feasible in structure.

The technical solution of the utility model is:

A kind of six rank band-pass loudspeaker systems with passive radiator, comprise forward and backward resonance box, the active loud speaker, it is characterized in that: the forward and backward installation on resonance box is provided with passive radiator, and this passive radiator is sealingly fastened on the forward and backward resonance box, makes passive radiator and forward and backward resonance box form the integral body of sealing.After initiatively loud speaker is driven, produce vibration and by with resonance box in the coupling of air, make air generation vibration in the resonance box, air and sealing and fixing are installed on the coupling of the forward and backward passive radiator on the resonance box in the resonance box, cause forward and backward passive radiator to do the piston vibration, to the space radiation sound wave, the sound wave of forward and backward passive radiator radiation different frequency range, out of phase, both superpose and realize the filtering of high and low frequency, thereby realize accurate six rank band-pass responses.

Described active loud speaker is traditional direct radiator type electrodynamic loudspeaker, and its installation site is the dividing plate in the middle of the forward and backward cavity of resonance box, after being driven, respectively forward, the rear chamber radiative acoustic wave.It is installed and must firmly mechanical oscillation can not occur, and cotton with the sealing of dividing plate junction cushioning, as the EVA cotton.

Described resonance box is made up of former and later two resonance boxes, and passive radiator also has former and later two, and on the resonance box, back passive radiator is logical to be installed on the resonance box of back before preceding passive radiator was installed on, and two resonance boxes connect by the active loud speaker.Tank material must select firm difficult vibrations material to make the sheet material as MDF, requires sealing.

Described passive radiator, be a kind of composite material make connect the vibration sounding device of a plane or the conical surface by the good ring of elasticity; Ring must have good elasticity, is difficult for producing inelastic deformation simultaneously; The vibration sounding device must possess enough rigidity, can not produce deformation during with the assurance vibration, vibrates to be piston vibration.

Above-mentioned passive radiator, its concrete structure is: the centre is the vibration sounding device, and this vibration sounding device is slab construction or pyramidal structure, and the outer rim of vibration sounding device has ring, ring is to being externally connected with support, and the vibration sounding device is connected on the resonance box by support.

The utility model adopts passive radiator to replace traditional pipe of falling the case, and swept area is big, exports on an equal basis under the acoustic pressure situation, has reduced air vibration speed, and has improved the low frequency radiation distortion, and the system that shows significantly reduces doing low frequency playback time windage noise; The adjustment of the major parameter of passive radiator and physical dimension do not have inevitable relation, and the physical dimension degree of freedom compares higher, therefore have bigger flexibility on structural design, are particularly suitable for the design of small-sized sound system; Simultaneously, passive radiator separates resonance box and outside air, can effectively suppress the influence of the interior sound wave normal-mode of resonance box to system's acoustic radiation, effectively reduces the nonlinear distortion of system.

Description of drawings

Fig. 1 tradition six rank band general formula speaker systems,

Fig. 2 tradition six rank band general formula speaker system analogy line maps,

Fig. 3 acoustic construction schematic diagram of the present utility model,

Fig. 4 acoustic analog line map of the present utility model,

Fig. 5 is the structural representation of passive radiator,

Fig. 6 is the side schematic view of passive radiator.

Embodiment

Further introduce architectural feature of the present utility model and enforcement below in conjunction with accompanying drawing:

Acoustic construction of the present utility model and scheme of installation as shown in Figure 3,

Wherein, initiatively loud speaker is traditional direct radiator type electrodynamic loudspeaker, and its installation site is the dividing plate in the middle of the forward and backward cavity of resonance box, after being driven, respectively forward, the rear chamber radiative acoustic wave.It is installed and must firmly mechanical oscillation can not occur, and cotton with dividing plate junction cushioning EVA sealing.

Resonance box is made up of former and later two resonance boxes, and passive radiator also has former and later two, and on the resonance box, back passive radiator is logical to be installed on the resonance box of back before preceding passive radiator was installed on, and two resonance boxes connect by the active loud speaker.Tank material must select firm Xiao Yi vibrations material to make the sheet material as MDF, requires sealing.

In conjunction with Fig. 5, Fig. 6, passive radiator is made by composite material, is specifically connected the vibration sounding device 1 on a plane by the good ring 2 of elasticity; The outer rim of vibration sounding device 1 has ring 2, and ring 2 is to being externally connected with support 3, and vibration sounding device 1 is connected on the resonance box by support 3.Ring 2 must have good elasticity, is difficult for producing inelastic deformation simultaneously; Vibration sounding device 1 must possess enough rigidity, can not produce deformation during with the assurance vibration, and simultaneously, passive radiator and preceding resonance box fixed position make whole system airtight by screw and glue fixing seal.

Passive radiator can separate the air inside and outside the case as can be seen, can effectively suppress the influence of case energy sound wave normal-mode to system's acoustic radiation, effectively reduces the nonlinear distortion of system.

According to the acoustic analog principle acoustic analog line map of the present utility model that can draw, as shown in Figure 4.Wherein Pg is the equivalent sound potential source, Ma is the equivalent sound quality of active loud speaker, Ca is that the equivalent sound of initiatively loud speaker is suitable, Ra is the equivalent acoustic resistance of active loud speaker, and Cbf is that the equivalent sound of preceding resonance box is suitable, and Mpf is the equivalent sound quality of preceding passive radiator, Cpf is that the equivalent sound of preceding passive radiator is suitable, Cbr is that the equivalent sound of back resonance box is suitable, and Mpr is the equivalent sound quality of back passive radiator, and Cpr is that the equivalent sound of back passive radiator is suitable.The pressure frequency response function that can draw the radiation of sound system of the present utility model institute thus is as follows:

$P_{\mathrm{pr}}=\frac{\mathrm{\&rho;f}}{2r}|U_{\mathrm{pr}}-U_{\mathrm{pf}}|=\frac{\mathrm{\&rho;}{P}_g}{4\mathrm{\&pi;r}{M}_a}\left|G_p\left(\mathrm{jw}\right)\right|$

LLU _PrBe the volume velocity of back passive radiator promotion air, U _PfBe the volume velocity of back passive radiator promotion air,

$G_p\left(\mathrm{jw}\right)=\frac{\frac{{\left(\mathrm{jw}\right)}^2}{{W_s}^2}[\frac{\mathrm{\&gamma;}}{\mathrm{\&alpha;}}-\frac{\mathrm{\&delta;}}{\mathrm{\&beta;}}+\frac{{\left(\mathrm{jw}\right)}^2}{{W_s}^2}(\frac{\mathrm{\&gamma;}}{{{\mathrm{<figure-callout\; id="2"\; label="h\; f"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">h</figure-callout>}}_f}^2\mathrm{\&alpha;}}-\frac{\mathrm{\&delta;}}{\mathrm{\&beta;}{h_r}^2})}{\left[\begin{array}{c}\frac{(\mathrm{\&alpha;}+\mathrm{\&gamma;})(\mathrm{\&beta;}+\mathrm{\&delta;})+(\mathrm{\&beta;}+\mathrm{\&delta;})+(\mathrm{\&alpha;}+\mathrm{\&gamma;})}{\mathrm{\&alpha;\&beta;}}+\frac{\mathrm{jw}}{W_s{Q}_t}\frac{(\mathrm{\&alpha;}+\mathrm{\&gamma;})(\mathrm{\&beta;}+\mathrm{\&delta;})}{\mathrm{\&alpha;\&beta;}}\\ +\frac{{\left(\mathrm{jw}\right)}^2}{{W_s}^2}[\frac{(\mathrm{\&alpha;}+\mathrm{\&gamma;})(\mathrm{\&beta;}+\mathrm{\&delta;})}{\mathrm{\&alpha;\&beta;}}+\frac{1}{{h_r}^2}\frac{(\mathrm{\&alpha;}+1)(\mathrm{\&beta;}+\mathrm{\&delta;})+\mathrm{\&alpha;}}{\mathrm{\&alpha;\&beta;}}+\frac{1}{{h_f}^2}\frac{(\mathrm{\&alpha;}+\mathrm{\&gamma;})(\mathrm{\&beta;}+1)+\mathrm{\&beta;}}{\mathrm{\&alpha;\&beta;}}]\\ +\frac{{\left(\mathrm{jw}\right)}^3}{{W_s}^3{Q}_t}[\frac{1}{{h_r}^2}\left(\frac{\mathrm{\&beta;}+\mathrm{\&delta;}}{\mathrm{\&beta;}}\right)+\frac{1}{{h_f}^2}\left(\frac{\mathrm{\&alpha;}+\mathrm{\&gamma;}}{\mathrm{\&alpha;}}\right)]+\frac{{\left(\mathrm{jw}\right)}^4}{{W_s}^4}[\frac{1}{{h_r}^2}\left(\frac{\mathrm{\&beta;}+\mathrm{\&delta;}}{\mathrm{\&beta;}}\right)+\frac{1}{{h_f}^2}\left(\frac{\mathrm{\&alpha;}+\mathrm{\&gamma;}}{\mathrm{\&alpha;}}\right)+\frac{\mathrm{\&beta;\&alpha;}+\mathrm{\&beta;}+\mathrm{\&alpha;}}{\mathrm{\&alpha;\&beta;}{h_r}^2{h_f}^2}]\\ +\frac{{\left(\mathrm{jw}\right)}^5}{{h_r}^2{h_f}^2{W_s}^5{Q}_t}+\frac{{\left(\mathrm{jw}\right)}^6}{{h_r}^2{h_f}^2{W_s}^6}\end{array}\right]}$

Wherein: C _Br=α C _aC _Bf=β C _a $W_{\mathrm{pr}}=\frac{1}{\sqrt{M_{\mathrm{pr}}{C}_{\mathrm{pr}}}}=h_r{W}_s;$ $W_{\mathrm{pf}}=\frac{1}{\sqrt{M_{\mathrm{pf}}{C}_{\mathrm{pf}}}}=h_f{W}_s;$ C _pr＝γC _a；C _pf＝δC _a；

Obtain flat response then $\frac{\mathrm{\&gamma;}}{\mathrm{\&alpha;}}=\frac{\mathrm{\&delta;}}{\mathrm{\&beta;}},$ Promptly $\frac{C_{\mathrm{br}}}{C_{\mathrm{bf}}}=\frac{C_{\mathrm{pr}}}{C_{\mathrm{pf}}},$ This moment, system function can be reduced to:

$G_p\left(\mathrm{jw}\right)=\frac{\frac{{\left(\mathrm{jw}\right)}^4}{{W_s}^4}\frac{\mathrm{\&gamma;}}{\mathrm{\&alpha;}}(\frac{1}{{h_f}^2}-\frac{1}{{h_r}^2})}{\left[\begin{array}{c}(1+\frac{\mathrm{\&gamma;}}{\mathrm{\&alpha;}})(1+\frac{\mathrm{\&gamma;}}{\mathrm{\&alpha;}}+\frac{1}{\mathrm{\&alpha;}}+\frac{1}{\mathrm{\&beta;}})+\frac{\mathrm{jw}}{W_s{Q}_t}{(1+\frac{\mathrm{\&gamma;}}{\mathrm{\&alpha;}})}^2+\frac{{\left(\mathrm{jw}\right)}^2}{{W_s}^2}[{(1+\frac{\mathrm{\&gamma;}}{\mathrm{\&alpha;}})}^2(1+\frac{1}{{{\mathrm{<figure-callout\; id="2"\; label="h\; r"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">h</figure-callout>}}_r}^2}+\frac{1}{{h_f}^2})+\frac{1}{{{\mathrm{<figure-callout\; id="2"\; label="h\; r"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">h</figure-callout>}}_r}^2\mathrm{\&beta;}}+\frac{1}{{{\mathrm{\&alpha;h}}_f}^2}]\\ +\frac{{\left(\mathrm{jw}\right)}^3}{{{W_s}^{3}Q}_t}(1+\frac{\mathrm{\&gamma;}}{\mathrm{\&alpha;}})(\frac{1}{{{\mathrm{<figure-callout\; id="2"\; label="h\; r"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">h</figure-callout>}}_r}^2}+\frac{1}{{h_f}^2})+\frac{{\left(\mathrm{jw}\right)}^4}{{W_s}^4}[(1+\frac{\mathrm{\&gamma;}}{\mathrm{\&alpha;}})(\frac{1}{{{\mathrm{<figure-callout\; id="2"\; label="h\; r"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">h</figure-callout>}}_r}^2}+\frac{1}{{h_f}^2})+\frac{1+\frac{1}{\mathrm{\&alpha;}}+\frac{1}{\mathrm{\&beta;}}}{{h_r}^2{h_f}^2}]+\frac{{\left(\mathrm{jw}\right)}^5}{{h_r}^2{h_f}^2{W_s}^5{Q}_t}+\frac{{\left(\mathrm{jw}\right)}^6}{{h_r}^2{h_f}^2{W_s}^6}\end{array}\right]}$

The characteristic of the system function of system function characteristic that this use this moment is novel and six traditional rank bandpass systems is closely similar, therefore can adopt identical analytical method to obtain relevant elements and box body parameter.Parameter for passive radiator before and after the specific intended response is certain, and just the compliance value of the resonance frequency of passive radiator and passive radiator can be by drawing Analysis of response.The resonance frequency of passive radiator is given by the following formula:

$f_p=\frac{1}{2\mathrm{\&pi;}\sqrt{M_{\mathrm{mp}}{C}_{\mathrm{mp}}}}=\frac{1}{2\mathrm{\&pi;}\sqrt{M_p{C}_p}};$ $M_p=\frac{M_{\mathrm{<figure-callout\; id="2"\; label="mp\; S\; p"\; filenames="Y20052005398800131.png"\; state="\{\{state\}\}">mp</figure-callout>}}}{{S_p}^{}};$ C _p＝C _mpS _p ²；

LLM _MpBe the equivalent mass of passive radiator, unit is Kg, M _pEquivalent sound quality for passive radiator

LLC _MpBe the equivalent force of passive radiator, unit is m/N, C _pFor the equivalent sound of passive radiator suitable

As can be seen, the resonance frequency of adjusting passive radiator can realize by the weight of change vibration sounding device and the coefficient of elasticity of ring, this is very easy to realize in actual use, the adjustment of passive radiator resonance frequency simultaneously can be carried out under the situation that does not change its physical dimension fully, and this has it and installs and advantage easy to adjust.

Simultaneously as can be seen under the situation of conditions permit, the area of vibration sounding device can be done greatly (general all greater than the effective radiating area of active loud speaker) as much as possible, as long as guarantee that equivalent sound quality and equivalent sound are along constant, then can not change the resonance frequency of passive radiator, area only increases and need get final product adjusting the weight of vibration sounding device and the compliance of ring, can not cause not having the increase that influences the longitudinal size of installing, compared to six traditional rank bandpass systems, the utility model has advantageous advantage in the mini-system design.

And sound radiation pressure and swept area and vibration velocity have such relation:

$P=\frac{\mathrm{\&rho;f}}{2r}{V}_p{S}_p$ -----P is a sound radiation pressure, and Vp is the radiator vibration velocity, and Sp is the radiator effective radiating area

The increase of swept area means under the situation of the same sound pressure level of output, the speed of the passive radiator institute driven air that the utility model adopted will greatly reduce, and the effective radiating area of passive radiator is much larger than the area of traditional phase-reversing tube, this just means under the situation of the same sound pressure level of output, the vibration velocity of air that the utility model promotes is far below traditional six rank band general formula systems, therefore the utility model can effectively reduce the low frequency radiation distortion, and the system that shows significantly reduces doing low frequency playback time windage noise.

More than comprehensive, the utility model has following advantage:

1, utilize the big feature of passive radiator swept area, export on an equal basis under the acoustic pressure situation, reduced air vibration speed, and improved the low frequency radiation distortion, the system that shows significantly reduces doing low frequency playback time windage noise;

2, because the adjustment of the major parameter of passive radiator and physical dimension do not have inevitable relation, the enough size degrees of freedom of knot compare higher, therefore have bigger flexibility on structural design, are particularly suitable for the design of small-sized sound system;

3, because passive radiator separates resonance box and outside air, can effectively suppress of the influence of the interior sound wave normal-mode of resonance box to system's acoustic radiation, effectively reduce the nonlinear distortion of system,

4, have and the similar Frequency Response of traditional six rank band general formula speaker systems.

Claims (6)

1, a kind of six rank band-pass loudspeaker systems with passive radiator, comprise forward and backward resonance box, the active loud speaker, it is characterized in that: the forward and backward installation on resonance box is provided with passive radiator, and this passive radiator is sealingly fastened on the forward and backward resonance box, makes passive radiator and forward and backward resonance box form the integral body of sealing.

2, six rank band-pass loudspeaker systems with passive radiator as claimed in claim 1, it is characterized in that initiatively loud speaker is traditional direct radiator type electrodynamic loudspeaker, its installation site is the dividing plate in the middle of the forward and backward cavity of resonance box, after being driven, respectively forward, the rear chamber radiative acoustic wave.

3, six rank band-pass loudspeaker systems with passive radiator as claimed in claim 2 is characterized in that initiatively loud speaker adds with the dividing plate junction to be lined with the sealing cotton.

4, six rank band-pass loudspeaker systems with passive radiator as claimed in claim 1, it is characterized in that the initiatively described resonance box of loud speaker, form by former and later two resonance boxes, passive radiator also has former and later two, preceding passive radiator is installed on the preceding resonance box, back passive radiator is logical to be installed on the resonance box of back, and two resonance boxes are by initiatively loud speaker connection.

5, as claim 1 or 4 described six rank band-pass loudspeaker systems with passive radiator, it is characterized in that the initiatively described passive radiator of loud speaker, be a kind of composite material make connect the vibration sounding device of a plane or the conical surface by the good ring of elasticity; Ring has good elasticity, and the vibration sounding utensil is prepared enough enough rigidity simultaneously.

6, six rank band-pass loudspeaker systems with passive radiator as claimed in claim 5, it is characterized in that the initiatively above-mentioned passive radiator of loud speaker, its concrete structure is: the centre is the vibration sounding device, this vibration sounding device is slab construction or pyramidal structure, the outer rim of vibration sounding device has ring, ring is to being externally connected with support, and the vibration sounding device is connected on the resonance box by support.

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