I don't think there has gons much effort into programming this course, nor is their a good understanding the needs of learners. I am on the point of quitting. The woman speaks too low, some men speak extremely fast. Many sentences are absurd and much of the vocabulary has no practical use. Why do I have to learn the difference between teaspoon and spoon, for god's sake? Or write: the elephant has no tail?
I share your frustration in regards to the audio examples. And I agree it is not well geared towards a learner to actually learn how to pronounce these words. I heard a person say that the course is still in beta.... if that is true then a lot of the issues make sense, and hopefully they fix it. They need to run a normalize filter on the female audio clips..... that would fix the woman speaker issues. And they need to redo the male audio clips as he slurs a lot and speaks way to fast. However, this is modern Hebrew, so teaspoon and spoon are valid vocab to learn. And the sentences are weird... like "my duck does not want to eat you", but that brings humor to learning. lol But before quitting, I would suggest using Memrise. Another user suggested it, and its awesome! Its like a flash card program that parallels the Duo course, and the speaker for the audio clips is actually understandable! Its a shame we currently need another app to learn how to pronounce words, but at least we have the option until Duo finally get these issues resolved. So hang in there, I feel your pain!