The Magma-118S passive subwoofer pair delivers professional bass reinforcement for live sound applications where you need serious low-end extension. These 18-inch subwoofers handle the frequencies your main speakers can't reproduce, extending your PA system's range down to 40 Hz for full-spectrum sound.

Each cabinet houses an 18-inch woofer with a robust 90-ounce magnet and 4-inch voice coil, engineered to handle 800 watts RMS and 1600 watts peak power. The ported design maximizes low-frequency output while maintaining clarity, reaching peak SPL levels of 125 dB when properly powered.

The 8-ohm impedance works with most amplifiers, while dual Speakon connectors support daisy-chaining multiple cabinets or linking to satellite speakers. Operating from 35 Hz to 300 Hz with optimal response between 40 Hz and 180 Hz, these subwoofers provide the foundation your system needs for contemporary worship music, DJ sets, and live band performances.

Perfect for churches upgrading their contemporary worship sound, mobile DJs working weddings and corporate events, and bands playing venues from 200 to 500 people. The built-in pole mounts accommodate top boxes, creating a complete PA stack that delivers full-range coverage.

Connect via Speakon cables to your amplifier or powered mixer's subwoofer output. Each cabinet weighs 107 pounds and measures 26.25" x 24" x 21" in a durable MDF enclosure with textured black finish.

Backed by Seismic Audio's one-year warranty with fast shipping nationwide. Professional-grade bass extension without the premium price tag.

Technical Specifications

Frequently Asked Questions

What amplifier power do I need for the Magma-118S subwoofers?

Match your amplifier's RMS output to the subwoofer's 800-watt RMS rating at 8 ohms for optimal performance. A quality amplifier in the 600-1000 watt range will drive these subwoofers effectively. Avoid underpowering, which can cause distortion and potential damage to the drivers.

How many people can these subwoofers cover?

The Magma-118S pair can provide bass reinforcement for venues holding 200-500 people, depending on the music style and room acoustics. For outdoor events or venues with high ceilings, consider adding more subwoofers to maintain consistent bass coverage throughout the space.

What cables do I need to connect these subwoofers?

You'll need Speakon-to-Speakon speaker cables to connect from your amplifier or powered mixer to the subwoofers. The dual Speakon connectors allow daisy-chaining multiple subwoofers or linking to satellite speakers using the same cable type.

Can I use these subwoofers without a crossover?

While these subwoofers will function without an external crossover, using your mixer's built-in crossover or a dedicated crossover unit will optimize performance. Set the crossover around 80-120 Hz to properly divide frequencies between your subwoofers and main speakers, preventing overlap and improving clarity.

How do these compare to powered subwoofers?

Passive subwoofers like the Magma-118S require separate amplification but offer more flexibility in amplifier choice and system expansion. They're often more cost-effective for permanent installations and allow you to upgrade amplifiers independently. Powered subwoofers include built-in amplification but limit your amplifier options.

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