The New Madrid 18-inch subwoofer driver delivers professional-grade low-end for DIY speaker builders and replacement projects. This 750W RMS driver handles the demanding bass frequencies that define modern live sound, from DJ rigs to church sound systems.

Built around dual 120-ounce magnets totaling 240 ounces of magnetic force, the New Madrid moves serious air. The 4-inch voice coil manages 750 watts RMS with peaks up to 1500 watts, producing deep bass extension down to 25Hz. The die-cast aluminum frame provides the rigid foundation needed for clean low-frequency reproduction without flex or distortion.

At 102dB sensitivity and 8-ohm impedance, this driver pairs well with most amplifiers while delivering efficient output. The paper cone with cloth surround construction balances durability with the natural resonance characteristics that bass players and electronic music producers demand. Frequency response spans 25Hz to 2kHz, covering the full subwoofer range plus lower midrange overlap.

Perfect for custom subwoofer cabinet builds, replacing blown drivers in existing subs, or upgrading older PA systems. This driver handles small to medium venues up to 500 people when properly powered and enclosured. The 43-pound weight reflects the substantial construction needed for serious bass reproduction.

This is a raw driver only — no cabinet, crossover, or terminals included. Standard speaker wire connections apply. Seismic Audio backs the New Madrid with a one-year warranty and fast shipping to get your bass project moving.

Technical Specifications

Frequently Asked Questions

What size venue can this 18-inch driver handle?

When properly powered with 750+ watts and housed in an appropriate enclosure, the New Madrid can handle small to medium venues up to 500 people. For larger outdoor events or dance clubs, consider multiple drivers or supplementing with additional subwoofers. The 102dB sensitivity means it produces substantial output without requiring massive amplifier power.

What do I need to build a complete subwoofer with this driver?

You'll need to construct or purchase an appropriate cabinet, install binding posts or speakon connectors, and add speaker wire. The driver comes as a raw component only — no enclosure, crossover, or connection hardware included. Research proper cabinet volume and tuning for optimal bass response from this specific driver.

Can I use this to replace a blown driver in my existing subwoofer?

Yes, if your current cabinet was designed for an 18-inch driver with similar power handling and impedance. Check that your existing amplifier provides adequate power (750W RMS minimum) and that the mounting hole pattern matches. The 8-ohm impedance makes it compatible with most PA amplifiers and powered mixer outputs.

How does this compare to smaller 15-inch subwoofer drivers?

The 18-inch New Madrid moves more air and extends deeper into the low bass frequencies than most 15-inch drivers. This translates to more physical impact and better reproduction of synthesizer bass, kick drums, and electronic music. However, 18-inch drivers require larger, heavier cabinets and more amplifier power to reach their full potential.

What amplifier power do I need to properly drive this subwoofer?

Plan for 750-1000 watts RMS at 8 ohms for optimal performance. The driver can handle peaks up to 1500 watts, but sustained power around 750W RMS will provide clean, undistorted bass output. Most professional power amplifiers or powered mixers with dedicated subwoofer outputs can drive this driver effectively.

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