HS-24’s are built by hand in North Carolina. They are sold individually.

Build time is 7 to 14 days.

Stereo Integrity HFS-24 24" D4 Subwoofer | 3500W RMS – Ultra-Compact, High-Performance Bass

Revolutionary Shallow-Mount 24" Subwoofer for Unmatched Performance

The Stereo Integrity HFS-24 24" D4 Subwoofer is an industry-leading compact 24” subwoofer designed for deep, powerful bass without sacrificing space. Engineered using FEA simulations, CAD software, and Klippel verification, this high-performance subwoofer features an advanced XBL² Neodymium motor, a massive 5” copper voice coil, and an incredibly shallow 8.75” mounting depth—making it the most compact large-format subwoofer available.

Cutting-Edge Motor & Suspension System

• Single Slug Neodymium Dual-Gap XBL² Cup Motor – Delivers extreme power and efficiency.
• 5" Low Inductance Copper Voice Coil – Provides superior thermal handling and durability.
• 10" Nomex Spider – Ensures linear suspension travel and stability.
• Black Anodized CNC Aluminum Motor Coupling Arms – Optimizes heat dissipation for extended performance.
• Dual Internal Shorting Rings – Lowers inductance for a cleaner, more accurate bass response.

Exceptional Cone & Enclosure Versatility

• Carbon Fiber & Kevlar Sandwich Cone Body – Lightweight yet incredibly strong for high SPL output.
• Treated Foam Surround – Provides precise cone control and durability.
• Cast Aluminum Basket – Enhances structural integrity while minimizing resonance.
• 80mm Peak-to-Peak Mechanical Travel – Deep, distortion-free low-end performance.
• Flat Stitched-On Spider Leads – Maximizes clearance and reliability.

Optimized Enclosure Flexibility for Maximum Output

Unlike conventional 24” subwoofers, the HFS-24 is designed to thrive in a variety of enclosures, making it one of the most adaptable high-performance subs available.

• Sealed Enclosure Volume: 3 - 10 ft³ – Delivers tight, accurate bass with extended low-frequency response.
• Minimum Sealed Enclosure: 3 ft³ – Ideal for compact setups without sacrificing bass performance.
• Maximum Sealed Enclosure: 10 ft³ – Provides deep, resonant bass in large enclosures.
• Dual-Opposed & Infinite Baffle Alignments – Ideal for custom, high-output audio setups.
• Behind-The-Screen Enclosures – Provides cinematic, immersive low-end reproduction.

Key Specifications

General Specifications:

• Weight: 40 lbs
• Outer Diameter (OD): 24.35 inches
• Cutout Diameter: 22.375 inches
• Mounting Depth: 8.75 inches
• Displacement: 0.25 cubic feet
• RMS Power Handling: 3500W

Thiele-Small Parameters:

• Re (DC Resistance): 6.7 Ohms
• Fs (Resonant Frequency): 20.5 Hz
• Qes (Electrical Q Factor): 0.68
• Qms (Mechanical Q Factor): 6.34
• Qts (Total Q Factor): 0.61
• Le (Inductance): 2.1 mH
• Sd (Effective Cone Area): 322.8 square inches
• Vas (Equivalent Compliance): 449.76 Liters
• BL (Motor Force Factor): 32.11 Tesla Meters
• Mms (Moving Mass): 807.29 grams
• Cms (Compliance): 70 µM/N
• Xmax (One-Way Linear Excursion): 25 mm (70% BL)
• SPL (Sensitivity @ 1W/1M): 90.3 dB

Material Composition:

• Surround Material: Treated Foam
• Cone Material: Carbon Fiber
• Voice Coil Material: Copper

Performance & Compliance:

• Frequency Response Minimum: 3 Hz
• Frequency Response Maximum: 2000 Hz
• Sensitivity: 90.3 dB

Additional Features:

• Voice Coil Diameter: 5 inches
• Terminal Type: Large 4 AWG Spring-Loaded
• Gross Weight: 40 lbs

Why Choose the Stereo Integrity HFS-24?

The HFS-24 24" D4 redefines what’s possible in a compact, high-output subwoofer, offering groundbreaking performance, ultra-low distortion, and extreme enclosure versatility. Whether you need high SPL output, audiophile-grade accuracy, or home theater bass enhancement, this shallow-mount 24” subwoofer is built to deliver deep, dynamic bass in a space-saving design.

Upgrade your audio experience with the Stereo Integrity HFS-24 – The most compact, high-performance 24” subwoofer available!