Oh you can't really. I mean if you're like me, your brain will fill in the blanks on that when you can see the pickup and where you're playing, but nah all I'm talking about is the general resonant quality of the instrument. The more it resonates, the better it seems to sound unplugged, and that often translates when amplified. Visa Versa, if a bass sound and feels dead unplugged, pickups don't do much to help. YMMV!