M-Audio GSR18 500-Watt Active Sound Reinforcement Subwoofer

Developed by the same engineering team behind our industry-leading reference monitors, the M-Audio® GSR18 active subwoofer adds serious low end to any full-range satellite speaker system. The 18” low-frequency driver and ultra-efficient Class D amplifier produce an impressive 500 watts of power for bass you can really feel. The variable crossover lets you dial in the perfect balance between the subwoofer and your full-range speakers for incredibly flat frequency response, while the phase invert button ensures that you get full, focused bass—regardless of stage position. The durable plywood enclosure and steel grille are designed to withstand the demands of constant use.

Ideal for any application

The GSR18 subwoofer is designed for maximum flexibility. Get incredibly flat frequency response when using the sub with the GSR10, GSR12, or any other full-range speakers—just use the variable crossover to dial in the perfect balance. You’re also guaranteed full, focused bass no matter where you place the sub, thanks to a phase invert button that flips the phase 180 degrees. It’s perfect for when you want to position the sub in a different direction than the full-range speakers. And the auto-select input voltage input lets you take your show anywhere in the world, without worrying about choosing the right voltage.

Built to perform

When you’re gearing up for a marathon set, you need to know your system will go the distance. That’s why the GSR18 features state-of the-art Class D amplification for 500 watts of continuous power, which translates into pure, punchy sound. Our ultra-efficient Class D power amplifier provides sustained high-output levels with minimum distortion and extremely low heat—even when operating at near-peak levels over extended periods of use. In short, the GSR18 can go for hours without compromise.

Maximum utility

We know that stage presence isn’t just about you. It’s about your gear, too. With its stylish good looks and ergonomic, functional design, GSR18 is easy on your eyes as well as your back. The four locking casters let you roll the sub into position and secure it in place—without breaking a sweat. The integrated 1.4” (36mm) speaker stand receptacle makes it ideal for sub and satellite applications. And the durable plywood enclosure and perforated 18-gauge steel grill will stand up to constant use for years to come.

Simple yet scalable

It’s easy to set up your GSR speaker system. Start with a stereo pair, or create a large speaker array by daisy-chaining up to three GSR speakers per side. Then add the powerful GSR18 subwoofer to complete a setup that will have enough bottom end to fill a larger venue. Then use the balanced XLR/TRS combo jack to connect line-level signals and dynamic microphones directly to your GSR speakers for instant sound reinforcement without any additional gear.