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The best location for our Sonos Sub is on the ground right next to our forced air vent that delivers air conditioning and heat. I'm a little hesitant to place it there though, with fears that it will get damaged. Does anyone know if my concerns are valid?



Thanks!
According to the product guide:
Operating Temperature 32°F to 104°F (0°C to 40°C)


I doubt your air conditioning would be set to 'Arctic', but the hot air direct from the heating system could well be a touch warm for it. Measure the temperature.
And Sonos does make a nice wall mount so you could elevate it above the vent, should you feel the need.
They make a variety of air deflectors for vents, designed to go under couches and the like or you could knock something together out of craftboard and tape that would do the job.



https://smile.amazon.com/s?url=search-alias%3Daps&field-keywords=vent+air+deflector