12 inch Subwoofer Spacer Rings (1/4 inch Thick) – 11 1/8 inch ID x 12 7/8 inch OD | SSK12 | MJM Car Speaker Adapters

Overview

Upgrade your car audio mounting with the MJM 12 inch Subwoofer Spacer Rings. These depth extenders, known by the model SSK12, are designed to provide extra mounting room where space is tight, helping you fit deeper drivers without sacrificing alignment or stability. The rings arrive as a practical pair and are built to help you tailor your installation to the exact space behind your speaker mounting area.

What you get and how it helps

Each spacer ring adds 1/4 inch of depth, giving you a controllable way to clear fiberglass enclosures or vehicle structures that sit close to the mounting surface. The overall dimensions ensure a consistent, flush fit with your existing mounting surface while keeping the woofer positioned for optimal sound projection. This setup is especially useful when you’re trying to achieve a deeper mounting profile in a tight dash, hatch, or mid-console space.

• Extra depth spacing to install deeper speakers in cramped compartments
• Durable PVC construction that resists wear and maintains a stable gap over time
• Stackable design: combine two or more pairs for greater depth clearance

Key benefits and real-world use cases

In practice, these spacers can help you align a deeper woofer with your grill or enclosure opening, maintaining clean lines and reducing contact with enclosure walls. The tough PVC construction provides a reliable, rigid spacer that won’t easily deform under vibration. If you’re working with fiberglass enclosures, the SSK12 is particularly helpful for framing and providing a consistent mounting plane while you finalize the fit.

For projects in cars with limited mounting depth behind the rear seat, in the trunk, or within compact door panels, stacking spacers offers a flexible approach to achieving the required clearance. You’re not promising a guaranteed outcome, but you are presenting a viable option to experiment with depth and fit before proceeding with full installation.

Installation ideas and tips

• Pattern your mounting layout first to determine whether one spacer is enough or two are needed for your depth target
• Keep the speaker frame aligned with the enclosure opening to preserve airflow and appearance

Dimensions to note: inner diameter (ID) is 11 1/8 inches and outer diameter (OD) is 12 7/8 inches, with a thickness of 1/4 inch. The product ships as a 1 pair set, ideal for framing fiberglass enclosures or providing additional depth as part of a broader mounting strategy.