a. A preference or an inclination, especially one that inhibits impartial judgment.
b. An unfair act or policy stemming from prejudice.
FWIW, I listen without bias.
I listen to new audio gear for at least a couple of weeks before reaching conclusions.
And then I either place my money where my mouth is (based on my hearing judgment), or I ditch the stuff.
AFAICT, most people don't really listen. Listening is at best a secondary judgment for them. (Sight and touch/feel and maybe even smell/taste come before hearing.)
But then it is still an open question to me as to how much one's hearing ability (the so called "golden ears") might make a difference.
My bet is that "golden ears" is hogwash and that most people hear AOK (short of the ones who work near jet airplanes or in construction and therefore have damaged hearing) and that all it takes is the belief that your hearing is OK.