on the premise that all the conditions are the same, if the drive circuit
provides enough voltage, the speaker can generate higher sound pressure
level. However, with the same voltage, but we use another speaker which
applies higher rated power, it will be difficult to drive and output lower
sound pressure level.
For example, a circuit can only provide the power of 8 ohm 1 W, in order
to generate higher sound pressure level we collocate a 2W speaker, the
SPL will be lower instead of higher. It is because with the increasing
of the power, the diaphragm should be thickened. The coil also needs to
be replaced by thicker wires. However, the thicker wires results in lower
impedance so we have to wind a bit longer more, and that makes the coil
heavier than before. Oppositely, if we use another speaker which loads
lower power or with lower impedance, it is likely to make a little bit
higher SPL, however the noise or burning down will possibly happen in
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