The SAP-18SEmpty gives you the flexibility to build your own custom 18" subwoofer system using your preferred driver. This empty cabinet is designed for DJs, bands, churches, and sound engineers who want to select their own woofer to match specific performance requirements or budget constraints.

This professional-grade empty enclosure provides the foundation for powerful low-end reinforcement in your PA system. The cabinet's internal volume and porting are optimized for 18" drivers, delivering the deep bass response needed for live sound applications.

Built with a 3/4" plywood front panel and durable black carpet covering with protective corners, this cabinet handles the rigors of regular transport and setup. The recessed black handles make loading easier, while the integrated speaker mount on top accommodates full-range speakers for complete system stacking. At 28" tall by 20" wide by 20" deep, it provides the internal airspace needed for proper 18" driver performance.

Use this cabinet for band PA systems, DJ setups, church sound reinforcement, or outdoor events where you need extended low-frequency response. The empty design lets you match the driver to your specific application – whether you prioritize maximum output, frequency response, or cost.

The cabinet includes dual 1/4" and dual Speakon inputs for flexible connection options. Simply install your chosen 18" driver, connect the provided internal wiring, and you're ready to deliver serious bass to your audience.

Seismic Audio backs this empty cabinet with a one-year warranty and ships it ready for your custom driver installation.

Technical Specifications

Frequently Asked Questions

What size driver fits in this empty subwoofer cabinet?

This cabinet is designed specifically for 18" drivers. The internal volume and port tuning are optimized for 18" woofers. Make sure your chosen driver's mounting pattern matches standard 18" specifications and that the driver's parameters work well with this cabinet's internal airspace.

What cables do I need to connect this subwoofer to my system?

You can use either 1/4" speaker cables or Speakon cables to connect from your amplifier or powered mixer to the cabinet's input panel. The cabinet includes both connection types, so choose based on what your amplifier or crossover outputs. Use 12-gauge or thicker speaker cable for best performance.

Do I need a separate amplifier for this empty cabinet?

Yes, this is a passive empty cabinet that requires an external amplifier. You'll need a power amplifier capable of driving your chosen 18" driver at the desired power level. Many users pair this with a dedicated subwoofer amplifier or use the subwoofer output from a powered mixer.

How does this compare to buying a complete powered subwoofer?

This empty cabinet gives you complete control over driver selection and allows you to upgrade or replace the driver later. It's ideal if you already have amplification or want to match a specific driver to your needs. Complete powered subwoofers offer convenience but less flexibility in component selection.

What venues work well with an 18" subwoofer system?

An 18" subwoofer handles medium to large venues effectively – think churches seating 200-500 people, outdoor festivals, wedding receptions, or club gigs. The exact coverage depends on your chosen driver and amplifier power, but 18" systems typically provide the low-end reinforcement needed for contemporary worship, DJ sets, and live bands.

WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer. For more information, go to: www.P65Warnings.ca.gov