When I was learning the English phonemes, I noticed that the phoneme represented by /z/ was pronounced significantly differently in the two tutorials I had purchased.

I had thought that maybe one of the pronunciation information was wrong, so I wanted to find more sounds so I could figure out which one was wrong.

I found two web pages about English phonemes, and it turned out that the pronunciation on these two sites corresponded to the pronunciation of those two pronunciation materials respectively.

1. [Interactive Phonemic Chart | Pronunciation | EnglishClub](https://www.englishclub.com/pronunciation/phonemic-chart-ia.htm)
2. [Interactive Phonemic Chart: The 44 sounds & symbols of English](http://cambridgeenglishonline.com/interactive_phonemic_chart/)

I was confused.

So why are there two different pronunciations?

I made this guess: maybe the two different pronunciations are distinguishable in my language system, but in English the two pronunciations are the same phonemes.

But I am not sure if this is the case or not.