This makes for a cute soundbite, but it doesn't mean what it implies. You could, for example, have a bunch of expensive headphones with frequency response that

This makes for a cute soundbite, but it doesn't mean what it implies. You could, for example, have a bunch of expensive headphones with frequency response that varies randomly in the [-1,+1] dB range, and a bunch of cheap headphones that are in the [-10,+10] dB range -- that would also show up as uncorrelated. Indeed, they did find a significant difference in magnitude response _error_, although the effect was quite small.