Introduction of Micro
How to choose:
The factors which affect
the SPL: the square measure of diaphragm, the amplitude of vibration,
magnetic field intensity, power, impedance, resonant chamber, the pattern
and the thickness of diaphragm, and the holes.
Power vs. SPL: Suppose all the conditions are the same,
increasing the power dose not mean the SPL will increase as well. We need
to revise the diaphragm and the sound coil to load the higher power, but
it leads to lower SPL instead.
Dimension vs. SPL: A larger speaker can vibrate more
air, therefore it provides higher SPL. In addition, the thicker speaker
can give wider amplitude of vibration which also leads to higher SPL.
Acoustics: What we request most is how much SPL a micro
speaker can output.
Matching: It will be better to provide the power slight
higher than the rated power for the enlarged circuit.
Question for mechanism:
The volume of the resonant
chamber: The general problem of the consuming products is that
the resonant chambers are not big enough. We can only try to find space
to enlarge the volume of the resonant chamber.
Sound Hole: Must be more than 1/8 of the diaphragm’s
area at least.
Airtight: The front and back sound fields of the speaker
should be separated to avoid neutralization.
Shock absorber: When a speaker works the vibration will
also happen at the same time. In order to reduce interference, it will
do good to have some material between speaker and case to absorb the shock.
Mounting: The speakers are usually fixed on the case.
Firmly fixed is important especially for the iron housing or the large
size to avoid separating in the drop test.