SL800 8” in-wall w/ backbox: can it be used under a covered patio (ie high moisture environment)?

It is built strong and sealed but its still a wood box laminated from pressed wood so i would still seal up the exterior of the opening where you plan to put it to further protect it, as for the woofer itself, i dont think its made from a polimer but a strong paper cone so that may not stand up over time but it will if its not getting directly bombarded by nature rain or snow.

Is this subwoofer self powered or does it need an amp?

Hello, this is a passive subwoofer so an amplifier is needed. We recommend our SMP500 subwoofer amplifier which you can find on Amazon, just search the ASIN: B07F94FSLF

Is the back box fire rated? Will it pass code that requires fire rated back boxes? What are the standards?

Although the back box was built to fire rated specs, there is no certification.

What is the actual dimension for this in wall subwoofer

Hello, the Unit Dimensions: (L x H x D) 22" x 17.5" x 4.3", and the Cutout Dimensions: (L x H) 20" x 14.5".

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🎶 Feel the bass, not the box — invisible power for your home theater!

SPACE SMART DESIGN - Compact sealed enclosure minimizes vibration and frees up floor space without sacrificing performance.
IMMERSIVE BASS POWERHOUSE - 300 watts of distortion-free, room-filling low frequencies for cinematic sound.
SEAMLESS WALL INTEGRATION - Trimless, paintable grille and frame blend invisibly with your décor—style meets stealth.
PRECISION ACOUSTIC ENGINEERING - 8" polypropylene woofer paired with a 10" passive radiator for rich, controlled bass response.
EFFORTLESS HOME THEATER UPGRADE - Designed for easy in-wall installation to elevate your surround sound system discreetly.

The OSD Audio SL800D is a high-performance in-wall subwoofer featuring an 8-inch polypropylene woofer and a 10-inch passive radiator, delivering 300 watts of deep, distortion-free bass. Its trimless, paintable design ensures a sleek, invisible integration into any room, while the sealed enclosure controls vibration for clean sound. Perfect for upgrading home theater systems with powerful low-frequency impact without sacrificing space or style.

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Material	Polypropylene
Model Name	SL800D
Speaker Type	Subwoofer
Special Feature	Coordinating sealed cabinets, paintable grilles & frames, and spring binding posts
Recommended Uses For Product	For Surround Sound Systems
Subwoofer Diameter	8 Inches
Surround Sound Channel Configuration	1.0
Color	white
Included Components	Manual, SUBWOOFER
Item Weight	8.17 kg
Is Waterproof	False
Number of Items	1
Control Method	Remote
Speaker Size	10 Inches
Power Source	Corded Electric
Batteries Required	No
Manufacturer	OSD Audio
Item Model Number	4348169735
Size	8 in In Wall w/BackBox
Wattage	300 W
Product Dimensions	55.88 x 10.16 x 45.72 cm; 8.16 kg

OSD Audio Trimless Wall Subwoofer Dual 8" Woofer 300W Sealed Enclosure Magnetic Grille SL800

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