I'm using a "SONY NUDE EX" as an earphone for iPod. It's called "plug type" or "sound isolating earphones".
It's not so expensive model, but the sound is so good for me compared with other models which include more expensive.
The other day, I lost one of the ear gasket so I went to an electric shop near my home to buy the spare ear gasket.
Unfortunately the electric shop did not stock the genuine spare parts and there was only a product of the other companies.
Clerk told me "You can use it for your earphone, because size of gasket is completely same." So I bought it reluctantly.
The spare ear gaskets were fitted with my earphone without any trouble but the sound itself was completely different !
It was definitely poor sound which reduced bass sound and overemphasis high pitched sound.
I had used it in patience for days, but I found the genuine spare ear gaskets at another electric shop today. I bought it immediately, then I could get back original sound.
I was surprised that sound is completely different due to the ear gaskets !
The engineer who design the "SONY NUDE EX" has total sound design technic include ear gasket. Excellent !

BTW, the spare ear gaskets package included 3 pair that are 1 pair of large size, 1 pair of middle size and 1 pair of small size.
I can allow this combinations for complete package with earphones. But I can not allow this combinations for spare package because everyone use only one size. Why do not they sell it by one size by 3 sets ?

It's enough on one size even if it is a very excellent design. They made me the ear gaskets millionaire.

tag : ipod