I'm glad you didn't put neutral in there. (I hate that word)
I prefer ..
Transparent - Easy to hear into the music, detailed, clear, not muddy. Wide flat frequency response, sharp time response, very low distortion and noise. A hear through quality that is akin to clarity and reveals all aspects of detail.
Like looking through a clear glass window into the music.
In his book "Mastering Audio: The Art and the Science" by Bob Katz, one of the legends in the recording industry, there is a frequency chart that lists terms such as nasal, boomy, boxy, fat, harsh, roomy, extended, etc. and matches them to specific frequency ranges.
The terms go back to the late 1940's if I remember correctly. I have the book and find it very useful for understanding not just how to describe sound, but how a true audio engineer goes through the process of creating a recording.
Here is the link to the chart page, which may or may not work since it's
As a new member I will find myself referencing to this very frequently. Now i understand all the vocab fellow head fiers are using in post-Its like i found the key to understanding(in audio terms of audio) incredible job and happy listening!