SBV21
MAG Theatron SBV21 Subwoofer
SBV21 is a high-performing compact-depth 21-inch cinema subwoofer designed for powerful immersive bass in premium home theater installations.
Overview
The MAG Theatron SBV21 is engineered to deliver full-theater low-frequency impact in private cinema environments. At its core is a high-sensitivity 21-inch woofer with a 4.5-inch voice coil, designed for high output with low compression and strong reliability. Despite its scale, the enclosure depth is held to 500 mm, making it easier to integrate in screen-wall and front-stage layouts where space is limited. MAG's Woofer InvisiVent Technology (WIVT), Double Demodulation Ring, and Triple Voice Coil Cooling system are focused on reducing distortion and maintaining control under sustained high SPL operation. With 128 dB max continuous SPL and extension down to 19 Hz (-10 dB), SBV21 is suited to high-performance rooms where tactile bass and dynamic headroom are non-negotiable.
Downloads & Documentation
MAG Theatron SBV21 Product Page
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SBV21 Datasheet (PDF)
SBV21 2D Drawings (DXF)
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SBV21 3D Drawings (DXF)
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SBV21 3D Drawings (DWG)
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SBV21 Drawings (PDF)
SBV21 Preset Data (XLSX)
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SBV21-4 Preset (ZIP)
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SBV21-8 Preset (ZIP)
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WMT-18 Anti-vibration Wall Mounting Bracket
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Pros & Cons
Strengths
- Very high output and headroom for large cinema spaces
- Deep extension supports tactile infrasonic soundtrack content
- Reduced depth compared with many large 21-inch subwoofers
- Engineered for low distortion under sustained high-level use
- Strong choice for multi-sub array deployments
Limitations
- Large front-face dimensions and heavy weight require planning
- Needs capable amplification and DSP integration
- Full performance depends on proper room calibration
Full Specifications
Driver & Enclosure
Performance
Mounting & Physical
Integrating MAG Theatron SBV21
At Kolosseum, SBV21 is specified for clients seeking theatrical low-frequency scale with better depth efficiency than traditional large-format subwoofers.
Room Requirements
Best suited to dedicated cinema rooms where structural support and sub positioning are planned early in the design phase.
Recommended Screen Pairing
Works well in behind-screen arrays where depth is constrained but high SPL and low-frequency extension are required.
Acoustic Considerations
For best bass uniformity and modal control, SBV21 is typically deployed in multi-sub layouts with processor-based delay, EQ, and level alignment.
Frequently Asked Questions About the MAG Theatron SBV21 Subwoofer.
SBV21 is a passive subwoofer and should be paired with suitable external amplification and DSP control for optimal performance.
Many high-output 21-inch subwoofers require deeper enclosures. SBV21's 500 mm depth can simplify integration behind screens and in constrained front-stage designs.
Yes, but for best room-wide consistency and modal control, multiple subwoofers with calibrated DSP alignment are recommended.
Compare Alternative Subwoofers.
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MAG Theatron CB-X12 active 12-inch subwoofer with 1200W class D DSP amplification, closed-box construction, and deep infrasonic performance for multi-sub cinema systems.
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MAG Theatron AVALON TOP LCR screen-wall array speaker platform using dedicated TOP C, TOP L, and TOP R variants. 15" + 4" + 6.5" AMT, 131 dB continuous SPL, and 100° x 40° controlled coverage.
View Details →UCX-218
Krix UCX-218 dual 18" under-cinema-floor subwoofer. Installs beneath the cinema floor for infrasonic bass extension with zero visual footprint.
View Details →Ready to Design Your Cinema Around the SBV21?
Kolosseum is an independent design consultancy, not a retailer. We design the complete cinema experience and connect you with authorized dealers for purchase and professional installation.
Tell us about your room, your budget, and your vision. We will create a complete cinema design that integrates the MAG Theatron SBV21 Subwoofer with the right screen, speakers, acoustics, and seating.