Alesis Nitro Headphone jack and AUX in disrcepency

Hi there, I am a beginner and recently purchased the Alesis Nitro, pretty cool but something doesnt seem right. My headphones are very quiet. I have to turn them very far up to drown out the sound of the pads, this results in a fuzzy background sound from the headphones as well. I have turned up the kit and pad volumes to max and this doesnt help. Meanwhile the aux in is super loud and would blow my ears up if the source volume is more than absolute minimum. I have not had a chance to hook up to a drum amp yet. Help please.
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