OP... What is your definition of "air?" Is it to increase the high frequencies, meaning more high-end extension? Or are you looking for the phenomenon of air around the instruments? This would increase the space surrounding each instrument and improve focus.
If all you want is more high-end detail and extension, then super tweeters are worth trying. For true "air" in the audiophile sense, then it's more complicated.
If all you want is more high-end detail and extension, then super tweeters are worth trying. For true "air" in the audiophile sense, then it's more complicated.