Okay, guys. Don't try this at home. Unless, of course, you love bass, pyrotechnics, and the shocking look of bewilderment on the faces of your guests.
This is a project I did a while back. The concept was to use the bass vents from buried subwoofers to interact with the flames of an outdoor wood-burning fire pit.
Details: Buried 3 high performance subwoofers in custom PVC enclosures. Vent the boxes via 3" automotive steel exhaust tubing to the fire pit. Cut hole in bottom of fire pit. Make custom heavy gauge perforated plate to contain ashes. Using our enclosure design software, it was determined that the air speed thru the ports was 76MPH.
Result: An extremely active display of music & fire that was a crowd pleasure and actually produced decent outdoor bass. I called it the Man Pit. At 76MPH windspeed, it does go through firewood pretty quickly. So, have ample supply on hand.
Enjoy!!!