linuxaudio.org

On Sun, Jul 20, 2008 at 12:26:05PM +0200, Arnold Krille wrote:
> I think truly flat responses is impossible with headphones.
Depends on what you call 'the response'. For a headphone

this would be ratio of the acoustic signal produced at

the entry of the ear canal to the driving voltage.

Now this must not be flat, at least not if you want

to use the headphone with signals that sound good

when reproduced by a speaker. The simple reason is

that the response from the speaker to the entry of

the ear canal is not flat, even if the free field

response of the speaker is.
More generally, expecting a headphone to work well

with signals that are intended for speakers is sort

of wanting the impossible. There should be a lot of

processing between the two. In practice headphones

are designed to be reasonable flat without any such

processing, which means they are some pragmatic

compromise.
> Just compare the

quoted text
> sizes of your more-or-less flat response studio

> speakers and the size of the average headphone.

> A speaker with a diameter of only a couple of

> cm has its  resonance never in the range the

> bass-driver of your studio-speakers.

Nor does it have to move large quantities of air.

But the most obvious difference that you listen

to the near field over most of the frequency range,

which is fundamentally different from a speaker.
Ciao,
--

FA
Laboratorio di Acustica ed Elettroacustica

Parma, Italia
O tu, che porte, correndo si ?

E guerra e morte !
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