Speakers, are devices technically called transducers, which transform one form of energy into another. i.e Speaker are devices that converts electrical energy into sound energy(acoustic).
Basically in a speaker, a paper diaphragm vibrates in accordance with the electrical signal fed into it. Flashing some light on its components shows a powerful ring magnet, a voice coil that is wound around a paper cylinder.
Moving to its functionality, the principle behind is electromagnetism. The interaction between the electromagnetic coil and permanent magnet drives the speaker to produce sound.
Diaphragm,sound source for a speaker. The voice coil is attached to the centre of the paper diaphragm at one side, which compresses and rarefies the particles around, thus producing sound.
Other than this sound enclosures play a vital role in audio experience. The air flow through the enclosure affects the bass sounds through undesirable harmonics. Its dimensions have an effect on the wave resonance.
Deep into the technicals, considering an amplifier.It has two signals the input and the output signal. Naturally for high gain, input impedance(resistance) should be as high as possible and output impedance should be as low as possible.
Finally, speaking about multiple speakers, positioning the speakers is very important.Because reflections cause the sound to be heard across all areas of a room or hall.Consider as if fitting light for your room or hall while for speakers as both are waves,this would produce great results as well.
