Colossal Sounds Ultra U-15 15" 2500W RMS Dual Voice Coil SPL Car Audio Subwoofer
Many in-stock orders ship within 1-2 business days, but timing varies by item. Custom, built-to-order, oversized, special-order and supplier-direct products may need extra processing time. Free shipping applies to qualifying orders over $99 in the contiguous US. Approved returns may be subject to a restocking fee.
Most products are covered by the manufacturer's warranty against defects. Damage from over-powering or improper installation isn't covered — we'll help coordinate any valid claim.
Tell us your vehicle, subwoofers and electrical setup and our team will help you match the right gear. Reach out before you buy.
Subwoofer Wiring Diagram
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Diagrams are on our wiring diagram page.
The Colossal Sounds Ultra U-15 is the perfect blend of SPL monster and accurate SQ driver — a perfected 15" ground-pounder that delivers an ear-to-ear grin with serious output and everyday efficiency. The Ultra series is designed and engineered to be THE sub you play all day, every day.
Key Features
- 2,500W RMS / 5,000W peak power handling
- 3" Precision Econowind US flat-wound 4-layer high-temperature voice coil
- Grade Y35 ferrite motor with triple 1" stacked magnets and custom top/bottom plates for cooling
- Non-pressed paper cone with glossy carbon-fiber dust cap
- Dual-layer 100% Nomex spider pack with triple-sewn heavy-duty lead wires
- Custom-tooled cast-aluminum basket optimized for cooling
- 33mm one-way Xmax
- Available in Dual 1-Ohm or Dual 2-Ohm voice coil configurations
Specifications
| RMS Power Handling | 2,500 Watts |
| Peak Power Handling | 5,000 Watts |
| Voice Coil Size | 3" |
| Voice Coil Configuration | Dual 1 Ω | Dual 2 Ω |
| XMAX (One Way) | 33mm |
Built to order — approximately 2-week build time.
Order yours from JS Ultimate Sounds — your authorized Colossal Sounds dealer.
