What "non-audio" accessory do you believe is essential for your listening room, system, etc.? Lava Lamp? Eames chair? Memorex "blown away" poster? Liquid or herbal sonic acuity enhancement serum? Special glass or coffee mug?
I have many, but the most recent upgrade to the listening room has been the addition of little Persian rug drink coasters:
I have many, but the most recent upgrade to the listening room has been the addition of little Persian rug drink coasters: