dbx 120X-DS is a Digital Series Subharmonic Synthesizer. It provides a powerful and easy way to add deep, room-shaking bass to any audio system, without the need for a separate subwoofer. The 120X-DS uses a patented process to create subharmonics, which are lower-frequency versions of the original audio signal. This results in a more full and satisfying sound, with extended bass response that can be felt as well as heard.

The 120X-DS is easy to use, with just a few simple controls. The Frequency knob allows you to adjust the crossover frequency, which determines the range of frequencies that will be synthesized. The Level knob controls the output level of the subharmonics, so you can dial in the perfect amount of bass for your system. The 120X-DS also features a Bypass switch, so you can quickly compare the sound with and without subharmonics.