Aman Khalid wrote:
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Aman,
The CIRCUIT of a speaker coil may look like a relay, but they don't behave in the same way, since the coil is MOVING in the magnetic field and dissipating energy to the air. Essentially that puts a low-ish value resistive shunt across the coil. The inductance of a speaker coil is usually very low, because there is a substantial reluctance around the magnetic circuit. In a relay coil at release, the magnetic circuit is complete, the coil unsaturated, and the inductance very high. Hence the free-wheel diode.



The capacitor is there for DC blocking, to protect the speaker.

Steve