X5.15 | Team Subwoofer 15" High-Output SPL Subwoofer

Soundstream X5-15 – 15" SPL Competition Subwoofer (3,500W RMS, Dual 1 Ohm)

When Soundstream's engineering team asked what the audio world wanted next, the answer was loud and clear: "Build a true SPL subwoofer." In response, the Soundstream X5-15 was born—an elite-level, limited-production 15-inch competition subwoofer designed for bass heads by bass heads.

Whether chasing trophies or wanting to be that guy with window-shattering bass, the X5-15 is ready to take your system to another level. From its 3,500W RMS power rating to its 4-inch dual 1-ohm voice coils, this subwoofer is built for brutal output and sustained performance—exactly what the SPL crowd demands.

Engineered for Extreme SPL Output

The Soundstream X5-15 wasn’t just made to play loud—it was made to compete. With a massive triple-stacked ferrite magnet, a 4-inch high-temperature aluminum voice coil, and 8-gauge duplex direct leads, this subwoofer is designed to push enormous amounts of power without sweat.

Its non-pressed pulp cone, reinforced with fiberglass and backed by a polyether foam high-roll surround, provides the stiffness and excursion control needed for precise, hard-hitting low frequencies. Whether running a ported box or sealed, the X5-15 is versatile enough to deliver tight, accurate bass or floor-rattling boom, depending on how you tune it.

Key Features and Specifications

• Model: X5-15
• Size: 15-inch
• Power Handling: 3,500W RMS / 7,000W Peak
• Voice Coils: 4” Dual 1Ω (DVC)
• Magnet: Triple-stacked high-density Ferrite
• Cone: Non-Pressed Paper with Fiberglass Reinforcement
• Surround: Polyether Foam (High Roll)
• Cooling: Multi-vent backplate with Enhanced Heat Dissipation
• Direct Leads: 8 AWG Duplex OFC
• Former: Black Anodized Aluminum
• Frame: Die-Cast Aluminum Basket
• Enclosure Compatibility: Sealed or Ported
• Recommended Amp Match: Tarantula XP Series High Output Amplifiers

Designed for Daily Abuse or SPL Showdowns

This isn't your average 15" subwoofer. The X5-15 is a competition-grade driver built with oversized components—from the coil to the magnet structure—to ensure maximum durability during extreme playback.

Perfect for low-impedance builds, it can be wired down to 1 ohm or even 0.5 ohm (if your amplifier supports it). The high-excursion design ensures deep, clean bass even when pushed hard, making it ideal for daily ground-pounder builds or full-blown SPL vehicles.

To configure dual voice coils correctly, refer to the official subwoofer wiring diagram for proper impedance matching and wiring options.

Built to Pair with Beast-Mode Amps

The X5 Series was developed with Soundstream’s Tarantula XP High Output Amplifiers, giving you a perfectly matched setup capable of delivering real-world 3,500W RMS power. Whether you’re running a single X5-15 or doubling down with two, these subs demand serious amplification to reach their full potential.

And yes, they’ll shake mirrors and raise eyebrows—especially if you’re wired to 0.5 ohm and feeding them clean power.

Ideal Applications

• SPL competitors and competition vehicle builds
• Custom trunk or wall builds for deep bass
• High-output street systems pushing 3,000W+
• Systems tuned for 32Hz–45Hz bass response
• Builders needing high-RMS subwoofers with thermal resilience