Mini speaker market today more and more varieties, by the young consumers of all ages. These mini speakers limited size, most products of the speaker unit between 2 to 3 inches, in theory, the low-frequency expressive these speakers are not very good, but in fact some well-known brands such as BOSE, JBL, SONY and other Bluetooth Speaker the low-frequency effects are pretty good, so in the end these companies use a style all their own to enhance what these mini bass speakers do?
Some Bluetooth speaker on the speaker unit, such as speaker unit JBL Xtreme2 ends, similar to the top SONY LSPX-S1 speaker diaphragm cell, intermediate the inner BOSE Soundlink Mini speaker unit and a speaker unit at the bottom of the domestic walker M5.
The speaker unit is a so-called passive diaphragm, also known as passive radiator. It is not simply a coil, a magnet and damper speaker. Retaining only passive diaphragm and the diaphragm supporting portion, or even directly to the diaphragm fixed to the case. Passive speaker diaphragm typically contains an active speaker unit and a speaker passive, i.e. passive or passive radiator diaphragm.
Like film applied to the unsprung weight. Spring is constituted by a diaphragm closing off the ring and cone edge of the air in chamber. And the weight of the counterweight is composed cone. Weight is an important part of the design aspects of the passive diaphragm, passive diaphragm resonance can be generated by the weight change, the principle is similar to a tuning fork. But different from the tuning fork, the passive vibration of the diaphragm does not decay rapidly departing from the resonant frequency range. Passive attenuation frequency diaphragm is usually per octave reduce 18db. Although it seems very steep curve, but still provide practical half of eighth notes as the speaker. Such means can be designed not reach low dive depth sounding resonates in the active speaker, while active frequency sound from the speaker unit to the utterance will not significantly interrupted between the passive frequency diaphragm, from high to generating an audio low smooth curve.
Passive speaker diaphragm, its advantages are:
1) In the speaker, the utterance of the passive diaphragm driven by passive air cabinets in the active speaker unit, and to have better bass performance.
2) commonly used in place of the passive diaphragm Invert tube to enhance the bass performance. Especially in some cases, it is too small for mounting the housing due inverter tube, passive diaphragm is a better alternative.
3) may be employed when designing the speaker smaller sized active speaker, bass with a passive diaphragm IF response and more accurate, better resolution.
Passive diaphragm is not the thicker the better, the thicker the passive diaphragm need more active stroke speaker unit as a basis. Because of the small size of the speaker unit is active could not move. Also, the heavier the passive diaphragm, damping worse, the bass becomes retractable inappropriate, resulting in sticky and muddy bass.
Saying: brightness frequency, IF is the thickness, the intensity is low. Equipped with a passive speaker diaphragm is small, but the low-frequency performance is also impressive, perhaps this is a mini speaker designed it.
