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I Turned A Boring Shed into An Epic Dolby Atmos Home Theater Tour

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A backyard shed in Michael Mansell’s yard just became a full Dolby Atmos screening room.

YouTuber Michael Mansell, who runs the ManShed channel, had a problem plenty of movie fans know well: no dedicated room inside the house for a proper home theater. His solution wasn’t to carve out a corner of the basement. It was to build an entirely new structure from the ground up in his backyard, purpose-built for tiered seating, a ceiling-mounted 4K projector, and a full Dolby Atmos speaker array.

• Mansell built a 14-by-20-foot shed from scratch, pouring the concrete pad and erecting the framing in a single day, then spent roughly two months finishing the interior into what he calls his “ShedCave.”
• The screening room centers on a 110-inch Seymour A.T. acoustically transparent screen (16:9 with 2.35:1 masking) paired with a ceiling-mounted JVC D-ILA RS2000 (NX7) native 4K projector.
• Audio runs through Triad Silver 4 LCR speakers behind the screen, Triad Silver 9 satellites overhead for Atmos height channels, and dual DIY GSG Audio BTS “Devastator” subwoofer enclosures.

From Backyard Shed to ShedCave

The build started with basics: a concrete pad and framing, both knocked out in a single work day. But Mansell didn’t stop at a standard shed roofline. He modified the initial roof pitch specifically to gain the vertical clearance needed for tiered stadium seating on a rear platform and an overhead-mounted projector — a detail that separates this project from a typical backyard storage build, closer in spirit to the kind of ground-up structural work covered in concrete pad and footing projects than to a weekend shed kit.

Engineering the Sightlines and Soundproofing

Before any drywall went up, Mansell mapped out speaker sound cones, viewing angles, and sightlines using Google SketchUp, planning the room virtually before committing to a two-month interior build. The structure got its own electrical circuits and dedicated air conditioning, then two layers of heavy drywall painted warm grey for acoustic isolation. Sound-dampening plush carpeting went down on the floor, and Mansell hand-built fabric-wrapped acoustic panels to treat first reflections off the side and rear walls — the same kind of interior finishing precision seen in other structural DIY builds like load-bearing renovation projects that require getting the bones right before anything decorative goes in.

A 14-by-20-foot shed, a concrete pad poured in a day, and a roof pitch redrawn specifically to fit stadium seating and a ceiling-mounted 4K projector.

The Gear List Behind the Picture and Sound

The finished picture comes from a 110-inch Seymour A.T. screen — acoustically transparent so speakers can sit directly behind it — running in 16:9 with 2.35:1 masking capability, fed by a ceiling-mounted JVC D-ILA RS2000 (NX7) native 4K projector. For sound, Mansell went with Triad Silver 4 LCR speakers positioned behind the screen for left, center, and right channels, Triad Silver 9 satellites mounted overhead for Dolby Atmos height effects, and two DIY flat-pack GSG Audio BTS “Devastator” subwoofer enclosures for low end.

Seating and Finishing Touches

Seating is luxury Valencia reclining home theater chairs, set on an elevated rear platform riser so the back row clears sightlines over the front. Mansell rounded out the room with perimeter accent sconces and overhead pot lighting, giving the ShedCave the ambient lighting cues of a real screening room rather than a converted outbuilding — the kind of detail that separates a finished home theater from a shed with a projector bolted to a rafter.