Advantages of empty paper cone speakers

EL-C1600N100013-B

Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle

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1. Empty paper cone speaker can effectively reduce the amplitude of speaker vibration

See Figure 4 and Figure 5 for the equivalent circuit of the inverted speaker and the empty cone speaker. The inverted speaker separates the speaker and the speaker due to the equivalent Cm of the catheter. Therefore, in the ultra-low frequency band, the working state is like free space, and the speaker vibration amplitude is large. This actually means that the air in the speaker is vented from the catheter, and a little load is not added. In addition, the speaker has a large amplitude of vibration and a relatively high distortion. In contrast, the empty cone speaker is in the subwoofer band. Since the sP (empty cone) couples the speaker to the speaker, the system is equivalent to mounting the speaker in a closed speaker with a volume similar to the equivalent +b. Happening. The amplitude of the vibration of the speaker is considerably suppressed, and the deep bass can be obtained under the condition of less vibration, and the low frequency distortion is smaller. In the subwoofer band, the empty cone speaker has a lower amplitude than the inverting speaker and is closer to the closed speaker. That is, the empty cone speaker can suppress the vibration amplitude increase over the entire frequency band. This is one of its advantages.

2. Empty paper cone speaker playback band sensitivity is higher

Inverted speaker, because the air is radiated from the catheter, so the lower the frequency, the closer the radiation pressure of the speaker and the catheter is to the ellipse, but the phase is opposite. As a result, the two completely cancel out outside the box. The designed speaker system is equivalent to attenuating at "18dB/oc~".

On the contrary, the empty cone speaker in the subwoofer band is added with the acoustic load of the empty cone support member, and the air in the box does not leak at all, so, as shown in Fig. 6, the sound pressure ratio radiated from the speaker The amount of sound pressure radiated from the empty cone is high. Therefore, this system attenuates in the subwoofer band with a slope of "12dB/~t". As the frequency increases, the radiated sound pressure of the empty cone increases, and finally reaches the same as the radiated sound pressure of the speaker (as at the point), at which point the two completely cancel each other out: the result is that the sound pressure frequency characteristic curve Generate a valley point: If the frequency continues to rise again, the sound pressure rises sharply when approaching. The sharp change in sound pressure can exceed the speed of "30dB/oet. Therefore, from the aspect of the playback band, its frequency characteristic curve drops sharply at the end. Then it rises sharply to form a sharp cutoff frequency shape. This is an empty paper cone. A great feature of the speaker.

3. Empty paper cone speaker is easy to use large diameter empty paper cone

In the inverted speaker, the guide area is small, and there is airflow noise that hinders the sense of hearing during operation. However, if the area of ​​the catheter is increased, the length of the catheter must be extended, and the length of the catheter is limited by the depth of the speaker. In addition, the space occupied by the duct reduces the effective volume of the speaker. Conversely, because the empty cone speaker can be adjusted with the cone weight, the empty cone installation is not limited by the size of other surrounding structures. Moreover, a large-diameter empty paper cone can be used without substantially reducing the internal volume of the speaker. The relationship between the speaker's internal volume and the frequency band ultimately depends on the woofer, but when the empty paper cone is used, the low-frequency range can be extended by appropriately adjusting the empty cone quality.

In this way, you can get a wide frequency range and hear the exciting bass sound and volume of the large-caliber woofer. In addition, since the flow rate of the air is reduced, noise and distortion due to air flow can also be avoided. Another point is that the impedance caused by the viscosity of the air is reduced, so that the efficiency is further improved: as the diameter of the I: l increases, the radiation impedance also increases. At the same time, as the diameter of the I:l is increased, the vibration amplitude of the empty cone can be reduced, so that the linearity of the system can be improved, and the output sound pressure level (volume) can be appropriately increased.

In addition, the empty paper cone is a stable amount because the sound insulation effect of the paper cone does not change with frequency, especially when the empty paper cone area is large, the fork can function as an effective sound absorbing material, so that the tank is not easily generated. Bad effects.

4. Not affected by the installation method

The installation location of the empty cone device can be set at any location. At present, some foreign manufacturers enter the empty paper cone device on the bottom or back of the speaker, but they are generally located in the lower part of the speaker baffle. When entering the empty cone device is installed at the bottom of the speaker panel. Not only the sound pressure in the mid- and low-range bands is not easily affected by the floor, but the right speaker height provides the basis for high-quality playback, the audio and video positioning will be better, and the center of the sound image will be generated at the appropriate height. Therefore, this installation method can hear clear and transparent low-frequency sound quality without much effort: in addition, the subwoofer band of the empty paper cone can use the reflection of the floor to improve the radiation efficiency, thus Further enhances the exciting bass effect. Practice has proved that the installation location has little effect on the sound release effect. In summary, the advantages of empty paper cone speakers are unmatched by the inverted speaker system. However, the empty paper cone speaker has an empty paper cone than the inverted speaker, and the cost will be improved. In addition, compared with the pilot of the inverted speaker, the resonance of the empty cone increases the Qoe value, so the characteristic is at the critical point. As mentioned above, the Qoe value of the speaker and the woofer o0 are not selected properly, and the satisfactory sound release effect is not obtained. This is a disadvantage. At the same time, some fans also believe that the sound quality transient response of the empty paper box replay is not good enough. Mainly subjectively think that the frequency of the low frequency band 201-Iz ~ 50Hz is "somewhat slow", the moment of landing is "not enough crisp and neat", the low frequency "transient and "control" are deteriorating. But the author listens to some world famous empty paper. Basin speakers such as s0m increase faber "Cameer Association Grand PiaIlo", THIEL (256 and other famous performance, the above viewpoint is difficult to establish. It seems that the above-mentioned shortcomings are still weak in design and accuracy.

Therefore, be careful when making the speakers, do not arbitrarily adjust, pay attention to a good analysis of the various phenomena appearing in the adjustment. Before designing and making, we must understand the meaning of various parameters of the system and appropriately correct the value of the characteristic parameters related to the sound quality.