| The
diaphragm of the speaker affects the sound a lot; let us discuss the affection
in the thickness, surface pattern and material.
1. Thickness
The speaker with higher input power, needs thicker diaphragm to match,
because the higher input power means the higher load and the stronger
vibration will be generated. If the diaphragm is not strong enough, the
noise will happen, and even the diaphragm will be ripped by the strong
power. With the same diameter, the thicker diaphragm has worse frequency
response (FO) at the low frequency (LF); therefore the speaker with higher
input power will have higher FO.
2. Pattern
There are two mainly patterns of Mylar diaphragm: concentric circles and
radiate patterns (picture. 1 and picture. 2). The different surface patterns
will generate different characteristics of FO. For example, picture 3
and picture 4 show the curves of concentric circles and radiate. The concentric
circles speaker has higher output S.P.L. before 5 KHz, but dramatically
falsl after 5 KHz; the radiate speaker has more stable output S.P.L.,
but to compare with concentric circles speaker, the output S.P.L. will
be lower before 5 KHz. Therefore, depend on the application, we can choose
the suitable patterns of diaphragm, the concentric circles is good for
the human voice, and the radiate pattern should be selected for playing
the music.
3. Material
Mylar, paper and clothes are the main material of diaphragm for mini/
micro speakers, the cost increases in order.
Mylar has the advantages of lower cost and easier to shape
up, but mylar is not suitable for the high power or large size speaker;
the paper diaphragm also have lower cost but more natural sound than Mylar,
however if the diameter is smaller than 30mm, it might cause difficulty
to manufacture and the defective rate may increase. Clothes diaphragm,
which can change the frequency response by adding different kinds of fibers,
has the best sound quality. However, clothes diaphragm is usually used
in the large size speakers because of the high cost.
 
 
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