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# Response of speaker to different freaquencies

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#### sreejith

##### Member level 3
Eventhough speech converted into electric signals may contain different freaquencies ,how it is possible to hear all different sound signals at speaker?
is the signal to the speaker is sum of audio signals or is it possible for the diafram to vibrate at different freaquencies simultaneously ?
how the signals with different freaquencies are handled by audio s/m?

Re: working of speaker and audio s/m

The speaker reproduces the sound pressure that occurred at the microphone. The speaker is not a resonant system that filters out all frequencies other than at the resonant frequency.

Re: working of speaker and audio s/m

But if different frequencies come at diafram, is it possible for it to vibrate at different freaquencies simultaneously and reproduce all freaquencies

Re: working of speaker and audio s/m

sreejith,
Yes, it is. To convince yourself that this is true, sketch out a waveform that consists of the sum of a fundamental and a third harmonic. The result will be a very crude approximation to a square wave, with "wiggles" in what would be the flat portions of the square wave. The speaker simply follows this waveform, which, in effect, means that it is vibrating at two different frequencies simultaneously.
Regards,
Kral

### sreejith

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Don't forget that each kind of speakers have a different behavior to frequency. What i mean is that if you aply a high audio frequency to a bass or woofer you might blast it, a woofer will vibrate only at very low audio frequency.
All speakers are analogic as so it doesn't make sense talking about sum of frequency. The only thing that matter is the dV/dt. All speakers responde to the instant variation of the applied signal.

### sreejith

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How the speaker DB is measured ?

the sound pressure measured in dbap is usually obtained using an "artificial ear"
which consists basically of a mike faced to the speaker, in a closed or determined enceinte.
one of the best in the domain - B&K equipment - see their site

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