Why this product stands out
This product is built to solve a real issue, fit the truck the way it should, and help the finished build feel more intentional instead of pieced together.
Need help before you order?
If you have fitment questions, need help choosing options, or just want to make sure you are ordering the right part, reach out before you order.
📞 530-327-8811
✉️ blazinbiddlesoffroad@gmail.com
Squarebody Upgrade
Built to Order
Real Fitment
Squarebody Interior & Functional Upgrades
DC Audio Level 4 Subwoofer (M4) – 1500W RMS 10” / 12” / 15” / 18” – Hand Built in the USA
Product starts at
$374.99
Available
- Built around real Squarebody fitment
- Designed to improve function, not just looks
- Made for people who actually use their trucks
- Cleaner result than piecing parts together
- Built to help finish your truck the right way
Designed for Squarebody owners
Real fitment and functional upgrades
Secure checkout
Direct support from Blazin' Biddles Offroad
The DC Audio Level 4 (M4) is the next step up for customers who want more output, more authority, and more thermal control than the Level 3.
If the Level 3 is the ultimate daily driver, the Level 4 is the loud daily / aggressive street bass upgrade.
🔥 1500 Watts RMS – 3000 Watts Peak
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1500 Watts RMS
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3000 Watts Peak
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Available in Dual 1Ω, Dual 2Ω, Dual 4Ω
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Sizes: 10”, 12”, 15”, 18”
This sub was designed to handle real power and deliver smashing low frequency output.
Perfect pairing with:
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PS2000x1 (single sub)
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PS3000x1 (dual setup)
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PS8000x1 (multi-sub builds)
🧠 Advanced Cooling & Motor Technology
The Level 4 now includes a 2.5mm aluminum shorting ring (demodulation ring) which:
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Reduces inductance
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Lowers distortion
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Reduces power compression
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Pulls heat from the coil windings
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Acts as an internal heat sink
Combined with direct-to-coil venting, airflow cycles across the coil and aluminum shorting ring simultaneously — dramatically improving heat dissipation under load.
💪 Motor & Suspension Upgrades
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Large triple stacked FEA-optimized motor
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Chrome top plate & T-yoke
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23.5mm Xmax
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3” High-temp 8-layer flat wound aluminum voice coil
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Triple 8” progressive spiders
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Multilayer polymer stitched surround
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Extremely rigid non-pressed paper cone
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Cast aluminum black frame
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Heavy-duty sewn tinsel leads
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Chrome spring-loaded push terminals
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Rubber DC & LV4 embossed magnet boot
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Rubber mounting gasket
This is built for serious output while maintaining musical control.
📊 Technical Specifications
| Specification | 10" | 12" | 15" | 18" |
|---|---|---|---|---|
| Mounting Depth | 6.25" | 6.75" | 8" | 9.5" |
| Mounting Hole | 9.35" | 11" | 14" | 16.75" |
| Outside Diameter | 11" | 12.5" | 15.7" | 18.5" |
| Voice Coil | 3.0" | 3.0" | 3.0" | 3.0" |
| Xmax | 23.5mm | 23.5mm | 23.5mm | 23.5mm |
| RMS/Peak | 1500/3000 | 1500/3000 | 1500/3000 | 1500/3000 |
| Ohm Options | D1/D2/D4 | D1/D2/D4 | D1/D2/D4 | D1/D2/D4 |
📦 Recommended Enclosures (Per Sub)
🔹 Sealed
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10” – .75 cu ft
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12” – 1.0 cu ft
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15” – 2.0 cu ft
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18” – 3.5 cu ft
🔹 Ported
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10” – 1.0 cu ft
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12” – 1.5 cu ft
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15” – 3.0 cu ft
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18” – 5.5 cu ft
🎯 Ideal For
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Loud daily drivers
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Aggressive street bass builds
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Dual sub setups
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High power ported enclosures
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Systems stepping beyond entry-level
This is the sub for customers who want to feel the difference.
📦 What’s Included
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DC Audio Level 4 Subwoofer
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Rubber Mounting Gasket
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DC Embossed Magnet Boot