Conventional mixing wisdom has always had it that a little bit of quiet before you mix can help you better zero in on the details of a mix. In fact, that’s one of the tips in personal prepping for your mix as outlined in The Mixing Engineer’s Handbook and Audio Mixing Bootcamp books.
“Try to stay in the most quiet area that you can for as long as you can before you begin your mix. Concentrate on the sounds that you’re hearing and try to identify what they are and the direction they’re coming from. Studies have found that this can make your hearing much more acute.”
The books go on to provide another useful tip that many mixers employ while mixing that many dub The Ray Charles Effect:
“Also remember that closing your eyes while mixing can sometimes improve your hearing by both lessening the distractions and allowing your brain to concentrate additional processing power on that sense.”