SHC SUB15 DIY Home Cinema Subwoofer

SUB15X added to SUB15 Guide – Out Now!

The Challenge

A few years ago, we set out to find speakers that could truly recreate the sound of a commercial theater. However, the DIY and commercial options were either too large for us or too expensive. To achieve the efficiency and clarity of a cinema experience, we used horn-loaded compression drivers for the LCRs. However, we quickly realized that to meet our performance goals, we also needed to design our own subwoofer to complement the LCR10 and ensure accurate bass performance.

But again we didn’t stop at a single design. We knew that our needs might change over time, and we wanted a system that could grow and adapt with us. Especially with DIY speakers, as the investment goes beyond cost—each build takes hours of design and construction. Unfortunately, none of the DIY or commercial designs on the market offered this kind of versatility. So, we committed to a modular design – just like the LCRs – that would allow flexibility, future-proofing our setup without sacrificing sound quality.

The Solution

The SUB15 subwoofer is designed to deliver excellent in-room bass down to 25 Hz or lower, seamlessly integrating with the LCR10s for a full baffle wall system or serving as support subwoofers throughout the room. Matching the height and depth of the LCRs, the SUB15 expands to 60 cm in width for greater internal volume, fitting into spaces just 30 cm deep and 52 cm tall—the same as the half-height LCR10. For more output, the sub can scale to match the 1-meter tall LCR10s by building a 102L version with single or dual drivers or stacking two 50L units. Learn more about how we arrived at the design in, Designing a High Performing DIY Modular Subwoofer.

Knowing that we couldn’t offer fully finished speakers from the start, we still wanted everyone to experience lifelike cinema sound at home. So, we designed this subwoofer building guide to be simple and accessible, enabling anyone—whether a beginner or experienced DIYer—to build a high-performance, adaptable speaker system that fits into their space, budget, and vision for a true cinema experience. Our goal is to give you the tools and insights to bring the magic of commercial theater sound into your home, making immersive audio accessible to all skill levels.

We’re thrilled with the results, having integrated these speakers into our own theaters, and are now designing an even more powerful Subwoofer that would still fall under the SUB15 line. We hope you experience as much satisfaction and excitement in building and listening to these speakers as we did creating them!

Now Including the SUB15X!

Shortly after releasing the SUB15, we discovered a driver that could significantly Improve its original design. Recognizing this opportunity, we adapted the SUB15 to accommodate the new driver, resulting in the SUB15X.

The SUB15X is equipped with Stereo Integrity’s SQL15 Series 2 driver, which doubles the X-max of the original SUB15 to an impressive 28mm while remaining only slightly deeper. This driver can handle up to 2500W before reaching X-max in a 50L enclosure. However, it comes with trade-offs: the driver is more expensive and harder to source.

This upgrade increases the maximum SPL by up to 6 dB per driver compared to the SUB15 when using the recommended amplifier across the entire frequency range. This extra headroom provides flexibility: you can either push for greater output or apply heavier pre-EQ to extend low-frequency performance. With the added headroom, the risk of overloading the driver is greatly reduced. While the SUB15 requires more caution, the SUB15X is far less susceptible to damage.

To accommodate the deeper driver, the SUB15X features front-face mounting, with a rear-panel cutout covered by a metal plate to improve cooling for the voice coil. Despite these adjustments, the subwoofer’s overall depth remains within our recommended 30 cm enclosure, ensuring it integrates seamlessly into your space.

In keeping with our commitment to modularity, we’ve minimized changes to the design. Only the front and back panels differ between the SUB15 and SUB15X, while all other components remain interchangeable. This ensures existing users can easily adapt their systems while newcomers can enjoy the latest performance enhancements.

With the SUB15X, you get the flexibility of the original SUB15, but with even greater power and precision—perfect for those seeking a true cinema experience at home.

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