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What does Frequency Response for headphones mean?
In these days, when choosing two earphones, you hear a lot of terms: bass, treble, dynamic range, cutoff, softness, isolation factor, driver impedance, oh my!
And, waitthen also the, oh so famous, Frequency Response. Hang on what is this frequency response that everyone seems to be talking about?
Frequency response is one of the most simple and significant factors in figuring out how well a set of earphones works.
In order to grasp what the term "frequency response" means, you have to think for a minute about what "hearing" actually means. When we hear, we simply receive waves of pressure with our ears.
Now think of a wave. Like a wave in the sea, getting to the shore, when you are sitting on the beach. Say that one wave reaches the shore after another. And say that you see a new wavefront reach you every second.
Ok, if that's the case then it means that you're getting a wave with the frequency of 1Hz (Hertz), which simply means one oscillation every second.
Now, with sound waves, (which just means the music that you want to listen), the process is the same: each wave that you hear has a certain frequency. And your ears are really capable of hearing only those audio waves that have a frequency between 20Hz and 20000Hz. A wave outside of that range, won't even be heard by your ears, and so , when that happens, we do not even call it a sound wave anymore.
Now, a real musical piece will not only consist of a single frequency. It will include the composition of full set of frequencies, all playing at the same time, all falling in the range of audible frequencies (20-20000 Hz). And each frequency will have its own intensity. This composition of frequencies is known as "sound spectrum".
The sound spectrum will create the explicit sound signature of the musical piece that you're listening too.
Now, back to our earphones. What will Happen if your earphones, when they reproduce your music, in the process they alter these intensities of the frequencies of the sound spectrum?
Well It happens that they finish up reproducing a different sound signature than what was originally recorded. They're not reproducing the music with good fidelity.
That is the reason why ideally you'd need a good pair of earphones, like the best iPhone headphones available, that simply reproduces each frequency amplitude exactly at the same amplitude at which it was recorded.
In truth, even the best pair of phones, will warp a bit the frequency amplitudes that are being reproduced. They are going to add their own signature, on top of the recored sound frequency spectrum.
The way in which a pair of earphones tweaks the sound frequency spectrum is named frequency response of the headphones.
Hence say you have two frequencies in your sound: 1kHz and 2kHz with equal amplitude, Ideally you'd need them reproduced with the same amplitude by the phones. Therefore say, have the earphones have a frequency response equal to a multiplier of 5 for both 1kHz and 2kHz, those 2 frequencies will remain undistorted as their relative amplitudes will remain the same.
If, on the other hand, the frequency response of the earphones is equals 5 a 1kHz, and 3 at 2kHz, then the reproduced sound spectrum will be deformed because the proportions of the two amplitudes gets changed by the headphones.
So, ideally you'd want a frequency response for your headphones to be flat, for all frequencies between 20Hz and 20kHz. This is the perfect situation. And there aren't any headphones on earth with a positively ideal response.
What you want to look for is a pair of headphones that gets close enough to this flat frequency response, so that all frequencies in the audible range maintain *almost* the same relative amplitudes and the shape of the reproduced sound spectrum is as unmodified as practical.
Mark Sounding is an isa busy 1 with a tick for his Apple iPhone. He maintains a internet site called iPhone Headphones Review, where he posted articles like his Klipsch S4i review and his Shure SE535 review.
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