It started on a Tuesday morning; I was using my Mower and then it hit me. Why did Kylo Ren get his lightsaber at Lowes? or the Home Depot?
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Kylo Ren's lightsaber sounds so raw and animalistic because it was supposed to mirror his own raw and unrestrained abilities.
David Acord a sound designer for The Force Awakens explained this in an interview with Nerdist:
David Acord: I think the most obvious new sound effect in the movie is Kylo’s lightsaber. We were attempting, along with his Force power effect, to create sound effects that would mimic his persona, which is this raw power he has that’s not quite formed. He’s not well trained, but he’s extremely powerful. It’s a little wild and dangerous. The sword itself, the look of the sword has the extra darts coming out the side, and it’s really sparky and wavery and it looks a little homemade. The idea of the sound was to match that–something that sounds like raw energy, just pure power, very brutal and kind of wild and dangerous sounding.