e_resolu
Head-Fier
- Joined
- Apr 4, 2007
- Posts
- 55
- Likes
- 10
Quote:
I can try to remind you how it works.
I’m an engine engineer and in one of my previous job I was dealing with a software that aim at tuning the pressure waves to improve the quantity of air that goes inside the cylinders at a specific engine speed. This is done trough adjusting the distance between the cylinder and a sudden diameter enlargement.
What could be the link between engines and IEMs?
What’s the physical?
The driver obviously creates acoustic pressure waves which travel trough the earphone canal and then arrive in your ear canal (hope it’s not a scoop
). Because of the sudden enlargement from the earphone canal to your ear canal, one part of the wave is transmitted in the direction of your eardrum (which is what we want I suppose
) and the other part is reflected in the opposite direction back to the driver. This reflection has to be controlled and can be used to tune the sound. The length of the IEM canal deals with the time for a wave to go back to the driver and the diameter ratio between the earphone canal and the ear canal deals with the intensity of that reflection.
How can it change the sound?
Depending on the time to come back to the driver, the reflective pressure wave can arrive in phase or in the opposite phase than other (new) pressure waves. The combination of the reflective and other pressure waves in the IEM canal could modify the original sound signal (in a controlled or uncontrolled way).
Hope it is clear enough (English is not my mother tongue). This is probably a simplification of what can occur in an IEM and I will not risk to give more explanations since I’m not a sound engineer (we should also take also into account the interactions between drivers, frequencies…)
I’ve red a few pages backward that a Head-Fier (perhaps you Headphoneaddict?) has enlarged the outer diameter of his IEM canal (not his ear canal
) doing a kind of cone shape and then found it has reduced a concern he has with the mids…
Originally Posted by HeadphoneAddict /img/forum/go_quote.gif I know the diameter and length can be used to tune the sound, but I forget which change does what. Someone at Westone told me once, but I was distracted. |
I can try to remind you how it works.
I’m an engine engineer and in one of my previous job I was dealing with a software that aim at tuning the pressure waves to improve the quantity of air that goes inside the cylinders at a specific engine speed. This is done trough adjusting the distance between the cylinder and a sudden diameter enlargement.
What could be the link between engines and IEMs?
What’s the physical?
The driver obviously creates acoustic pressure waves which travel trough the earphone canal and then arrive in your ear canal (hope it’s not a scoop
How can it change the sound?
Depending on the time to come back to the driver, the reflective pressure wave can arrive in phase or in the opposite phase than other (new) pressure waves. The combination of the reflective and other pressure waves in the IEM canal could modify the original sound signal (in a controlled or uncontrolled way).
Hope it is clear enough (English is not my mother tongue). This is probably a simplification of what can occur in an IEM and I will not risk to give more explanations since I’m not a sound engineer (we should also take also into account the interactions between drivers, frequencies…)
I’ve red a few pages backward that a Head-Fier (perhaps you Headphoneaddict?) has enlarged the outer diameter of his IEM canal (not his ear canal