JBL Xtreme 4, Xtreme 3, Charge 5: which one is louder?

Is Xtreme 4 louder than Xtreme 3? How much Xtreme is louder than Charge?
Same track, same recording conditions.
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Видео JBL Xtreme 4, Xtreme 3, Charge 5: which one is louder? канала JBL_Lover