The Mackie Thump18S is a powered subwoofer that features an 18" custom high-output woofer. With 1200 watts of power, you get the high bass output you need in a package that is designed to be tough and portable.

Featuring a built-in crossover at 140 Hz, stereo high-pass outputs and full-range outputs, the Thump18S allows you to connect top speakers and additional subwoofers without any extra hardware. Using efficient Class-D amplification and a dynamic bass frequency response, the speaker is designed to deliver a clear and present low end at any volume.

Features:

• Professional band-pass design for maximum output and deep, room-filling lows
• 18" custom high-output woofer
• Class-D amplification designed for cool running 
• Precision crossover (140 Hz)
• Tuning filters deliver highly accurate bass response
• Robust system protection
• Dual XLR inputs for mono or stereo applications
• Stereo high-pass outputs optimize sound when connecting top boxes
• Stereo full-range outputs perfect for adding more subwoofers
• User-adjustable level and polarity controls
• Easily mount your full-range loudspeaker via pole cup