"The battles are part of a New Zealand subculture where music enthusiasts cover their cars in up to dozens of industrial speakers, loudhailers and sirens, then

"The battles are part of a New Zealand subculture where music enthusiasts cover their cars in up to dozens of industrial speakers, loudhailers and sirens, then compete to have the loudest and clearest sounds." Those people ain't "music enthusiasts", they are "noise enthusiasts". Music enthusiasts do not intentionally destroy their ears or those of others.