HD-SUB24 2024+ Subwoofer Saddlebag Drop-In Kit

PRE-ORDER INFORMATION

This is a PRE-ORDER to reserve one of the first Velocity or Hertz HD-SUB24 Kits.

Subwoofer Kit reservations will begin shipping Shortly After Sturgis 2026

• Please Note That Limited Quantities Are Available

Drop-In Modular Subwoofer System

The HD-SUB24 is a genuine drop-in modular bass system engineered specifically for 2024+ Harley-Davidson Touring motorcycles.

Designed for riders who want serious low-end performance without permanently sacrificing valuable saddlebag storage, each enclosure features a premium 10-inch subwoofer paired with an integrated 8-inch passive radiator inside a completely self-contained enclosure.

Unlike traditional saddlebag subwoofer systems that use the entire saddlebag as the speaker enclosure, each HD-SUB24 enclosure is acoustically sealed. This design produces deeper, cleaner bass while allowing your saddlebag lid speakers to perform naturally without unwanted air pressure inside the bag.

The result is cleaner installation, stronger bass performance, improved overall sound quality, and the flexibility to remove the system whenever additional storage is needed.

Three Ways to Ride

Maximum Bass

Install both enclosures and enjoy the full performance of a true dual-subwoofer system.

Maximum Flexibility

Need extra room in one saddlebag?

Simply remove one enclosure while leaving the other installed. You'll retain impressive bass performance while regaining the full storage capacity of the opposite saddlebag.

Maximum Storage

Planning a long trip?

Remove both enclosures to restore the full storage capacity of both factory saddlebags.

When you're ready for powerful bass again, simply reinstall the enclosures and reconnect the included plug-and-play wiring harness.

Bass when you want it. Storage when you need it.

Note: This system installs inside your factory Harley-Davidson saddlebags. Saddlebags are required and are not included.

Why a Self-Contained Enclosure?

Most Harley-Davidson saddlebag subwoofer systems rely on the entire saddlebag as the acoustic enclosure.

That means every bass note pressurizes the entire saddlebag, forcing lid speakers to work against constantly changing air pressure. Many systems require additional baffles or isolation panels simply to maintain proper speaker performance.

The HD-SUB24 was engineered differently.

Each enclosure houses its own dedicated 10-inch subwoofer and 8-inch passive radiator inside a precision-engineered enclosure.

Because the enclosure is completely sealed:

• Bass energy stays inside the enclosure—not inside your saddlebag.
• Saddlebag lid speakers perform naturally without unwanted pressure loading.
• No additional isolation panels or baffles are required.
• The passive radiator produces deeper bass and greater efficiency than traditional compact sealed designs.
• Midbass and sub-bass work together instead of competing.
• Every speaker on the motorcycle performs as part of one balanced audio system.

The result is deeper bass, greater clarity, and a more natural listening experience.

Engineered for Real-World Riding

Adding bass shouldn't come at the expense of your motorcycle's handling or touring capability.

Each fully assembled enclosure weighs approximately 17 pounds, keeping the system within Harley-Davidson's recommended saddlebag load capacity while preserving the motorcycle's balanced handling characteristics.

Rather than relying on oversized amplifiers and excessive power, the HD-SUB24 was engineered for efficiency. The precision enclosure, passive radiator, and properly matched subwoofer maximize every watt of amplifier power.

Designed to Deliver

• Approximately 17 lbs. per enclosure
• Designed within Harley-Davidson saddlebag load recommendations
• Preserves factory handling characteristics
• Outstanding bass output without excessive amplifier power
• Highly efficient acoustic design

Audio System Compatibility

The HD-SUB24 integrates easily into properly configured Extreme Audio systems.

Typical amplifier configuration:

• Front amplifier channels power up to four full-range speakers.
• Rear amplifier channels power the dual subwoofers.
• No additional amplifier is required when paired with compatible audio systems.

The result is a balanced system with crystal-clear highs, dynamic midrange, and deep, authoritative bass.

Available Subwoofer Options

The HD-SUB24 is available with your choice of two premium 10-inch subwoofers.

Both have been extensively tested in this enclosure and deliver exceptional performance. Neither is "better"—they simply offer different sound characteristics.

Velocity Performance Edition

Designed specifically for this enclosure, the Velocity subwoofer was engineered alongside the enclosure and passive radiator to function as one complete acoustic package.

Specifications

• 300 Watts RMS
• 600 Watts Max Power
• Frequency Response: 20–400 Hz
• Injection Molded Cone
• Santoprene Surround
• 38 mm TIL Voice Coil
• 56 oz Ferrite Magnet

Best For

• Country
• Rock
• Classic Rock
• Southern Rock
• Blues
• Live Recordings

Expect

• Tight, punchy bass
• Excellent kick drum impact
• Outstanding bass guitar definition
• Fast transient response
• Natural, musical low frequencies

Hertz Reference Edition

The Hertz CS 250 S2 is known for producing exceptionally deep, controlled bass from compact enclosures.

Specifications

• 300 Watts RMS
• 600 Watts Max Power
• 2 Ohm Voice Coil
• Polypropylene Cone
• High-Density Ferrite Magnet
• 35 mm Voice Coil

Best For

• Hip-Hop
• Rap
• EDM
• Pop
• R&B
• Bass-heavy music

Expect

• Exceptional low-frequency extension
• Smooth, effortless bass reproduction
• Powerful sub-bass authority
• Outstanding musical accuracy

LEARN MORE "ABOUT US" BELOW***

LEARN ABOUT OUR SPEAKERS BELOW***
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***For use on 2023.5, 2024, and 2025 Harley-Davidson Motorcycles ONLY.