Armenian of today has all but one sound from EB's time (we're talking "official", not vernacular dialects), and that would be the first consonant sound in how most people would pronounce the English word 'water'. The letter that corresponded to the 'w' sound now corresponds to the 'v' sound, as in the first sound in 'villain'.
EDIT: In summary, you're looking at morphological differences between then and now, not a problem with pronunciation. And those morphological differences are known, thankfully (before the Armenian alphabet the Armenians used the Greek alphabet, among others, and haven't lost the consonant sounds that have become lost or archaic in languages like Greek; e.g., the voiceless velar fricative, Greek X).
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