Quite a rare product to find, I bought this for a project but didn’t end up using it in the end. You get four independent channels with the ability to save 99 compressor settings which truly sets this unit apart from the rest. The item is in excellent working condition. However expect to see signs of racking at the bottom of the unit. I have attached photos. Sale is for Mackie Quad Comp ONLY. Mackie’s 24-bit rackmountable Quad Comp is a user-friendly compressor/gate with an analog-style front panel interface designed for world-class sound for live performance applications. The Quad Comp starts with no-compromise 24-bit circuitry, all-new digital algorithms, and the legendary ease-of-use, which has become a Mackie hallmark. Wisely built, the Quad Comp offers instant storage and recall of frequently used scenarios, while intelligent features and intuitive control panels make Quad Comp ideal for use in fast-paced live settings. A powerful and road-ready addition to any serious live sound toolbox, that’s the Quad Comp. Mackie Quad Comp at a Glance. 4-channel rackmount digital compressor/gate for live sound with snapshot recall. Built-in key filtering for independent gating and compression. Intuitively laid out front panel with ultrabright 12-segment metering. The Mackie Quad Comp/Gate is a state-of-the-art four-channel rackmount digital compressor/gate designed for world-class sound. Its compression/limiting and gating/expansion algorithms were written by the digital gurus at Acuma Labs to provide a very wide range of high-quality, instantly usable settings. With 99 user definable snapshots for calling up, say, a favorite bass or vocal compression sound, the Quad Comp/Gate makes it much easier to get consistently fast, great-sounding mixes versus analog compressor/gates. Independent gating and compression. But it doesn’t stop there. The Quad Comp/Gate’s built-in Key Filtering function provides independent gating and compression based on an adjustable triggering frequency, and features a convenient Key Listen-so you can easily dial-in and monitor the specific range of frequencies while you’re in the mix. A Side Chain input allows for triggering the compression/gating using external signals. And the Quad Comp/Gate’s “Auto” feature senses input transients to automatically adjust attack and release times-eliminating the “pumping” effect associated with compression triggering. Intuitively Laid Out Front Panel. Of course, none of the Quad Comp/Gate’s bells and whistles would matter for live sound engineers if it wasn’t amazingly fast to use. So the front panel is intuitively laid out with ultrabright 12-segment metering, multi-color backlit buttons and nine backlit push-button knobs with LED collars to indicate settings from a mile away. You simply press the channel(s) you wish to process and adjust the knobs accordingly. Channels can be operated independently or stereo-linked with a single button press, making global FOH limiting adjustments fast and convenient. For maximum flexibility, the Quad Comp/Gate’s rear panel includes both 1/4″ TRS and XLR connections, TRS Side Chain send and return, and a “Planet Earth power supply, which operates on voltages between 100 and 240v. Mackie Quad Comp Features. 4 channels of 24-bit digital compression/limiting and gate/expansion. Custom algorithms developed by Acuma Labs. Individual gain reduction and output metering per channel. Individual key filtering per comp and gate channels. 99 snapshots for instant store and recall of settings. Stereo Linking of channels A and B, C and D. Intuitive, easy to use front panel. Professional input/output connections (XLR & TRS). Additional external side chain connections. Power Supply (100-240VAC 50/60Hz).