For sure there are many variables. Also the rest of the audio system affects how the sound is perceived. Even the type of music can be a factor. My preference is based on my "system".
Holy SIT!
That's a lotta parts for a FW. Guessing a lot of them have the job of minding that SIT's bias drift.
(and no, this is not reverse-engineering, this is rampant speculation. With a touch of pornography on the side, lololololol)
