Record (audio only or video) your audio sound with your smart phone. And record the auditioned audio sound with the same phone. Compare 2 recorded sounds few times.
There’s not much point to an in-person audition if you’re basing your decision on the audio from a smart phone. For that matter, why bother with high end audio at all if you’ll just be listening on your phone to things like YouTube?
Human ears are always biased.
That we are always subject to bias does not mean that we are always biased. Of course there are always those who believe they know what we hear.