Crossword Genius

Revolutionary sound reproduction (5)

Ross

I believe the answer is:

vroom

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But I can't explain it at all! Could you help me understand?

(Other definitions for vroom that I've seen before include "roar away" , "Fast-moving car noise" , "(Of engine) make roaring sound (colloq.)" , "Exclamation imitating a revving car" , "loud engine noise" .)

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