Quantum Audio QWX4000/15D4

Quantum Audio QWX4000/15D4 QWX Series 15″ 4000W Peak Power Handling at 4 Ohm, Dual Voice Coil Paper Cone Component Car Subwoofer

We are a Quantum Audio authorized dealer so you get up-to-date, fully warrantied products. Shipping is free to the lower 48 states on everything you order!

What’s Inside?

• • 15″ Dual Voice Coil Car Subwoofer
• • Owner’s Manual

High-Excursion, High-Power Subwoofer with Rugged Cooling Design

Unleash powerful, distortion-free bass with a 2.5″ high-temperature voice coil built to handle extreme power levels. The compressed paper cone with double-stitched, high-excursion foam surround delivers deep, accurate low-end with impressive durability and control. Paired with a die-cast aluminum vented basket, this subwoofer stays cool and reliable even during high-output, hard-hitting sessions.

Sealed & Ported Enclosure Ready with Rugged Protection

Ensure every beat hits hard with a proprietary full-round PVC gasket that delivers an airtight seal for clean, punchy bass. Enjoy reliable, secure wiring thanks to heavy-gauge spring terminals, while the protective magnet cover shields your sub’s core components. Whether you prefer a sealed enclosure (2.82 cu ft) for tight, accurate lows or a ported enclosure (2.96 cu ft) for deeper, thunderous bass — this subwoofer is ready to perform.

Optimized Box Tuning for Deep, Powerful Bass

Achieve deep, powerful bass with a precise box tuning of 35Hz, perfectly balancing tightness and thump. The generous 19.63 sq in port area ensures smooth airflow for enhanced low-frequency response. Combined with an 11-inch port length, this setup delivers rich, booming bass that fills your space with clarity and impact.