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SKU: XSUB12-MKII
OSD XSUB12 MKII 12" In-Ground Subwoofer 600W Outdoor Burial Rated XSUB12
Bring true low-end to your backyard with the OSD XSUB12 MKII, a 12-inch passive in-ground subwoofer built to disappear into your landscape and stand up to the elements. The enclosure buries underground so only the weather-resistant vent shows above grade — and the vent can be primed and painted to blend into any setting. Its 360° omnidirectional design spreads smooth, even bass across patios, pools, gardens, and outdoor entertainment areas, filling the space with the depth that outdoor speakers alone can’t produce.
The MKII is a reliability-focused upgrade of the popular XSUB12. Enhanced voice-coil ventilation improves heat dissipation and long-term power handling, upgraded internal crossover components increase current-handling capability, and an improved cable-entry seal helps keep moisture out for years of dependable, buried operation. Reinforced packaging protects the unit in transit. Backed by a 5-year limited warranty, the XSUB12 MKII is built to keep performing season after season.
With a durable 12" polypropylene cone and rubber surround (not foam), 300W RMS / 600W peak power handling, and an 8-ohm passive design, the XSUB12 MKII pairs with a dedicated subwoofer amplifier to add rich, room-filling bass to any outdoor audio system. Use one to anchor a patio, or two on opposite sides of a larger space for fuller, more even coverage.
Features & Benefits
- Deep, even outdoor bass — 12" polypropylene cone with rubber surround for lasting performance in heat, cold, and humidity
- 360° omnidirectional coverage spreads low-frequency sound evenly across patios, pools, and gardens
- Buried in-ground design — only the weather-resistant vent shows; prime and paint it to blend into your landscape
- Upgraded for reliability (MKII): enhanced voice-coil ventilation for better heat dissipation and power handling
- Upgraded crossover with higher current-handling components for extended service life
- Improved cable-entry seal helps prevent water intrusion in buried installations
- 300W RMS / 600W peak, 8-ohm passive — pairs with a dedicated subwoofer amplifier
- Use one, or two in parallel for larger areas and more even bass coverage
- Reinforced packaging for safe transit
- Includes silicone-filled waterproof wire connectors
- Backed by a 5-year limited warranty
Why Add an In-Ground Subwoofer?
Outdoor speakers roll off in the low end because there are no room boundaries to reinforce bass. Adding an in-ground subwoofer restores that missing foundation — you feel the depth without cranking the volume, and your satellite speakers can focus on the mids and highs they do best. The result is a fuller, more balanced outdoor sound system, with the sub hidden discreetly in the landscape.
Do I Need a Subwoofer Amplifier?
Yes. The XSUB12 MKII is a passive subwoofer and requires a dedicated subwoofer amplifier — it does not connect directly to a receiver’s RCA/LFE output. For best performance and longevity, pair it with a mono subwoofer amplifier rated around 250–500W RMS at 8 ohms (for example, the OSD SMP500). To run two subwoofers, wire them in parallel for a 4-ohm load and use an amplifier rated for 4-ohm operation. Set the low-pass filter between roughly 80–120 Hz to blend with your landscape speakers.
Installation Tips
- Place the subwoofer within about 20 feet of the main listening area for best output.
- Locate underground utilities (call 811) before digging.
- Do not install below the water line — if the hole fills with water while digging, relocate or add a gravel drainage bed, and keep the vent above grade and clear of debris.
- Use equal wire lengths when installing two subs; use silicone-filled connectors and verify polarity.
Technical Specifications
- Speaker Type: 12" Burial-Rated In-Ground Outdoor Subwoofer
- Woofer: 12" Polypropylene Cone with Rubber Surround
- Power Handling: 300W RMS / 600W Peak
- Recommended Amplifier: 250–500W RMS mono subwoofer amplifier at 8 Ω
- Frequency Response: 20 Hz – 150 Hz (±3 dB)
- Sensitivity: 84 dB (1W/1m)
- Impedance: 8 Ohms
- Coverage: 360° Omnidirectional
- Enclosure: Weather-Resistant, Burial-Rated
- Dimensions (H × W × D): 24.5" × 24" × 13.75"
- Weight: 31 lbs
- Warranty: 5-Year Limited
Warning: California's Proposition 65
Warning:
This product can expose you to chemicals, including vinyl chloride, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.