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Scientific view of car audio conversion phase cone

Scientific view of car audio conversion phase cone:

1 what is the phase cone?

The so-called "phase taper (phase plug)", originally is we usually commonly known as the "bullet", which is independent to sound basin and fixed in all center speaker (also known as the dust cap range) of the pyramidal.
When talking about the phase cone, a lot of brothers usually put it in the same breath as the dust cap. In fact, although in azimuth, phase cone and dust cap is located in the same direction, that is in the middle of the horn, but both from the structure and effect would have very significant different phase cone in the structure is independent of the cone, not with cone oscillation the movement, and the practice is attached to the dust cap cone on cone oscillation when the dust cap also follow synchronous oscillation; and in effect, because the phase cone cone together with no oscillation, so based on this characteristic, the phase cone can play many changes and the effect of operation on acoustic horn, and the dust cap is more simply to prevent the effectiveness (of course, also in a certain extent of sound composition changes).
Usually we all call the phase Plug (Phase) as the "gun warhead", from the structure, is the sound of the basin with each other independent of the two speaker parts
And the dust cap although and phase cone is in the same range, but structure is attached to the sound basin above, while the shape of the most with the "bullet" type of the phase cones have more significant differences (of course, there are also some horn dustproof cap planning into a bullet head type, but effect and the phase cones also is different)
2 phase cone effect?
Above we now understand the definition of the phase cones, and it and a dust cap differences then we detailed analysis a more practical question: why use of phase taper? What kind of effect is the phase cone on the horn?
1 improved phase
Obviously, the first phase of the cone effect, should is the horn sound, and announced the phase correction. Specifically, we know that sound the horn of any point on the basin, in vocal oscillation, announced the sound waves are in accordance with the detailed frequency, to a particular scatter viewpoints to the nearby convey the and not alone towards the direction of the human ear to convey, and in the meantime, frequency, the higher the frequency, single acoustic wavelength and the energy is low frequency acoustic wave is shorter and less; therefore, it constitutes the following two conditions:
A. sound on the inside of the pot oscillation point announced sound, there will be a large some are to convey sound to the basin of the other side and then reflected out, which constitute a signal because some is direct to the human ear, another some is after reflection arrive ear, so in the hearing will is time difference and phase difference, and reflected signal and direct signal constitute intervention, prone to standing waves in the scene.
B. in the high frequency signal from the axis scattered point of view (that is, we are talking about the direction of the scale) is relatively narrow, especially cone basin type sound basin, the high frequency signals will naturally tend to "gather", resulting in a sense of space is not open.
For the above situation, after the addition of phase cone, to a large extent can be useful to improve the question. From the figure we can clearly see, because the phase taper itself does not with the sound basin oscillations with sound, so when the sound cone sounding, after adding phase cones in the central basin tone range, announced by the sound on the inside of the pot, the acoustic can timely reflection, and useful to correcting the reflection angle and phase, and shorten the time difference; together, phase cone reflecting the use can also be significant to broaden the high frequency signal scatter viewpoints, let in high frequency sound waves can be in a more broad space for outstanding communication.
2 to reduce the heat and optimize the response speed of the basin.
We know, the response speed of the sound basin with its components and working temperature directly. Because of the phase cones in the structure and the sound basin are independent of each other farewell, and the use of phase cone horn, the sound basin can be compared with the dust cap of the lighter, and enhance the sensitivity of the sound basin.
Together, if the speaker is using the dust cap, dust cap in with horn along the course of the oscillation, on the back of the space will gradually formed the accumulation of hot air, and this will directly cause all sound basin temperature height, and the response speed of the lower; and the use of the cone of the phase is not only does not exist the question, and the phase taper itself can also become a prominent "radiator, promote heat agile handling, and then let the horn all adhere to a lower temperature, and let the music sensitivity of the basin has been a certain degree of progress.
3 what speakers for the use of phase cone?
Although the phase cone has the outstanding characteristics of the above, but in the detailed planning of the speaker, is not the use of phase cone, it should also be in accordance with the speaker's personality requirements, detailed analysis of the question. In car audio, we see the use of phase cone loudspeaker unit, usually prominent rhythm, must request the "speed" on the sensitivity of 6 inch woofer, together in some high-end type of treble unit will also see that using the phase taper gauge row. But for some seeking efforts, Hou sound of voice coil unit, and scatter viewpoints have comparative broad dome tweeter, planning phase of the cone is rare.
In the practice of the horn in the process of selection, we should also pay attention to is, is not the same shape, different raw materials and different phases of the coatings cone, the sound effects will have certain degree is not the same; and, of course, the more profound knowledge for the phase cones, we
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