My question is about pronunciation of both e's in the word excelsis in Ecclesiastical Latin.
Here is an excerpt of a previous question in this site:
A final postscript: although what I've heard is that excelsis is pronounced in the Christmas carol is [ɛksʧɛlsis], wouldn't [ɛkʃɛlsis] be the "correct" Ecclesiastical pronunciation?
There is a comment by an Italian user that asserts that the answer to this question is "no", but what I want to remark is that it seems to be assumed that both e's in the word excelsis are pronounced /ɛ/.
I've also found this other question which states that these e's are both pronounced /ɛ/.
Now, looking at the entry excelsis at Wiktionary, I've surprisingly found the following phonetic transcription for Ecclesiastical Latin:
But there is also an alternative in brackets:
Maybe the problem is that I don't understand how Wiktionary works. I've tried to get it looking at this Appendix about Latin pronunciation, but I'm really confused. They seem to make a distinction between 100 BC and 100 AD, but in this case it seems not to make sense because, as far as I know, Ecclesiastical Latin was developed later, in the Middle Ages.
The Wiktionary article about International Phonetic Alphabet contains what I would expect about pronunciation of /e/ or /ɛ/.
Another problem is that I have heard lots of people and ensambles that were singing with an Ecclesiastical Latin pronunciation, but, unfortunately, their pronunciation is not always good.
Can anyone enlighten me about this?