Hertz HMS 12 B4-LD-C Subwoofer Add-On Kit for 2014-2026 Harley Davidson® Tri Glide and Street Glide 3 Limited Motorcycles

Hertz HMS 12 B4-LD-C 12” Subwoofer Upgrade – Harley-Davidson Tri Glide & Street Glide 3

The Deep, Powerful Bass Your Harley Has Been Missing!

Take your Harley-Davidson Tri Glide or Street Glide 3 audio system to the next level with the Hertz HMS 12 B4-LD-C 12-Inch, 4-ohm marine subwoofer upgrade from Volunteer Audio!

One of the biggest things missing from a traditional motorcycle audio system is deep, powerful bass. While upgrading your fairing, lower fairing, and Tour-Pak speakers can dramatically improve sound quality and volume, nothing replaces the low-frequency performance of a dedicated 12-inch subwoofer.

Our Hertz HMS 12-inch subwoofer upgrade delivers the powerful, full-bodied bass you’ve always wanted without sacrificing the storage space that makes your three-wheel Harley so practical.

One Hertz HMS 12 B4-LD-C Subwoofer – Multiple Amplifier Configurations

We’ve designed this subwoofer upgrade to work with several of our popular plug-and-play amplifier and speaker packages.

4-Speaker Systems – Hertz SP 4.900 or Velocity RZP 1500.4

If your motorcycle is equipped with four speakers in the upper fairing and Tour-Pak, our four-channel amplifier packages can power both your speakers and this 12-inch subwoofer.

Channels 1 and 2 power your four existing speakers.

Channels 3 and 4 are bridged together to power the Hertz HMS 12-inch, 4-ohm subwoofer.

This allows you to add tremendous bass to your four-speaker system without purchasing an additional amplifier!

6-Speaker Systems – Velocity RZP 2000.6

Want the ultimate audio experience with speakers in your upper fairing, lower fairing, and Tour-Pak?

Our Velocity RZP 2000.6 amplifier package allows you to power all six speakers while utilizing a dedicated bridged output for the Hertz HMS 12-inch subwoofer.

Whether you’re running a four-speaker or six-speaker configuration, the same Hertz HMS 12-inch subwoofer delivers the bass your system has been missing.

No Subwoofer Box Required – Keep Your Storage Space!

What makes this installation so special is the design of the Hertz HMS 12 B4-LD-C 12-inch marine subwoofer.

Unlike traditional car audio subwoofers that require large, bulky enclosures, the Hertz HMS 12 B4-LD-C is specifically designed for infinite baffle applications.

This means the subwoofer can utilize the motorcycle’s existing trunk cavity as its enclosure, eliminating the need for a separate subwoofer box.

The subwoofer mounts directly into the fiberglass-reinforced plastic rear wall of your Harley-Davidson’s trunk.

Because of its relatively lightweight design and the strength of the mounting surface, the subwoofer can be securely installed without requiring additional structural reinforcement when installed correctly.

The result is impressive, deep bass while retaining the majority of your valuable trunk storage!

How Much Storage Space Do You Lose?

Surprisingly little!

We actually tested the storage capacity after installing the Hertz HMS 12 B4-LD-C 12-inch subwoofer and were able to fit:

• Multiple motorcycle helmets
• Riding boots
• Rain gear
• Additional riding accessories and travel gear
• And we still had the entire Tour-Pak available for additional storage!

That’s a tremendous advantage over traditional subwoofer enclosures that can consume most of your available luggage space.

Built for the Elements – Marine-Grade Construction

The Hertz HMS 12 B4-LD-C 12-inch subwoofer is designed for demanding marine environments, making it an excellent choice for your Harley-Davidson.

Its weather-resistant marine construction is built to withstand exposure to moisture and the elements, while its efficient infinite baffle design allows it to produce excellent bass performance without a traditional enclosure.

You get the low-frequency performance you’ve been wanting in a package designed for the unique demands of your motorcycle.

What’s Included?

Our Volunteer Audio Hertz HMS 12-inch subwoofer upgrade includes:

• Hertz HMS 12 B4-LD-C 12-inch, 4-ohm marine subwoofer
• Stainless steel mounting hardware
• Plug-and-play wiring harness designed to integrate with your compatible Volunteer Audio amplifier package
• Access to our detailed, step-by-step installation videos

We’ve taken the guesswork out of adding a subwoofer to your three-wheel Harley!

Installation – Permanent Mount Design

Important: This is a permanent-mount subwoofer installation that requires modification of your motorcycle.

Installing the Hertz HMS 12 B4-LD-C 12-inch subwoofer requires removing the trunk assembly from the motorcycle to access the mounting location.

A properly sized opening must then be cut into the fiberglass-reinforced plastic rear wall of the trunk.

The subwoofer is permanently secured using the included stainless steel mounting hardware, along with silicone sealant to provide a weather-resistant seal around the mounting surface.

While this installation requires more work than our typical plug-and-play speaker upgrades, we’ve created detailed, step-by-step installation videos showing you exactly how to complete the process.

The result is a clean, professional installation that looks like it belongs on the motorcycle!

Experience the Volunteer Audio Difference

At Volunteer Audio, we don’t believe you should have to choose between great sound and the practicality of your motorcycle.

This Hertz HMS 12 B4-LD-C 12-inch subwoofer upgrade brings powerful, deep bass to your Harley-Davidson Tri Glide or Street Glide 3 while preserving the storage space you need for everyday riding and long-distance touring.

No bulky subwoofer enclosure. No additional amplifier required when paired with one of our compatible amplifier configurations. Just incredible bass, a clean installation, and the storage capacity you love.

Ready to add the bass your Harley has been missing?

Call Volunteer Audio at 1-844-30-AUDIO (1-844-302-8346) or visit www.volunteeraudio.com.

We’re here to help you build the perfect audio system for your motorcycle!