Why I understand A.J.Hoge 100% but CNN 20% only?

I am no native speaker. I have been reading an English book lot since 1970. Last 3.5 years I have been listening to A.J.Hoge and CNN. I have understood A.J. Hoge from the beginning and today I understand him 100%. Contrary, I understand CNN speakers only 20% or nothing. My Ears are normal from 10Hz to 250Hz, it needs only 10 dB. After 250 Hz to 8000 Hz, my ears need more and more dB to 100 dB. My ears are the same for both, A.J.Hoge and CNN. It is a big difference between 20% or nothing and 100%. I think A.J.Hoge speak at a higher volume every part of words and sentences, but CNN speakers not. They pronounce parts of words with low dB for my ears. I have discovered what I hear that I understand, what I do not hear I do not understand. Higher volume on my TV or Computer can’t solve my problem because there are higher noises also.
What do you think is the problem here? Maybe CNN speakers would need to be students of A.J.Hoge because their interest is to be clear to all, native and no native speakers.