The Symetrix 544 is a professional, four-channel dynamics processor configured as a combination expander and gate, designed for noise reduction and signal control in live sound and recording applications. Each of its four independent channels can function as either an expander, which progressively reduces gain as the signal falls below a set threshold, or a gate, which acts as an on/off switch to completely mute signals below the threshold. This dual functionality makes it a versatile tool for cleaning up audio tracks by reducing background noise, controlling microphone bleed, and tightening the sound of drums and other instruments by eliminating unwanted noise between notes or phrases.

The unit provides comprehensive control over the dynamics processing on each channel. Key parameters include adjustable threshold, attack time, release time, range (the amount of gain reduction applied), and a hold function to prevent the gate from chattering on signals with slow decay. These controls allow the engineer to finely tune the processor's behavior to suit the source material, from subtle noise reduction on a vocal track to aggressive gating on a snare drum. The 544 is designed for transparent operation, ensuring that the desired audio signal remains natural and unaffected while unwanted noise is effectively attenuated.

Housed in a single rack-space unit, the Symetrix 544 is built for reliability and ease of integration into professional audio racks. It features balanced inputs and outputs on both XLR and 1/4" TRS connectors, offering flexibility for connection to a wide range of equipment. Clear status LEDs indicate gain reduction activity on each channel. As part of Symetrix's respected line of analog signal processors, the 544 provides essential, high-quality dynamics control for system engineers, front-of-house mixers, and studio technicians seeking to achieve a cleaner, more polished mix by managing noise and improving signal-to-noise ratio across multiple channels.