The Mackie Thump18Sv4 is an active professional 18-inch subwoofer, with 1400W Peak power and Class D amplification. It delivers a maximum SPL Peak of 132dB and has a frequency response of 25Hz-160Hz at -10dB and 33Hz-160Hz at -3dB.

The Thump18Sv4 adds extra volume and deep low-end to any PA system, working seamlessly with the speakers in the Thump series. It features high-pass functions that adjust the sound according to the size of the speakers. It also offers the ability to manually adjust the crossover for greater control over the overall sound.

The portability of the Thump18Sv4 is enhanced by the integrated carry handles, making it easy to incorporate into a touring rig or live/gigging setup.