Used Behringer Multicom Pro-XL MDX4600 4 Channel Audio Interactive Dynamics Processor

Behringer Multicom Pro-XL MDX4600 4-Channel Audio Interactive Dynamics Processor
in good working condition. 

From Behringer:

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Switchable IKA (Interactive Knee Adaptation) program-adaptive compression circuitry combines the advantages of hard-knee and soft-knee characteristics

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IRC (Interactive Ratio Control) expander/gate circuitry for virtually inaudible noise suppression

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Switchable dynamic Enhancer for brilliant, lively audio even with heavy compression

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IGC (Interactive Gain Control) peak limiting circuitry combines clipper and program limiter for reliable and inaudible protection against signal peaks

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Switchable Low contour filter prevents "pumping" due to low-frequency dominated compression

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Stereo couple function selectable for channels 1/2 and 3/4

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Separate 8-segment LED meters for input/output levels and gain reduction

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Selectable operating level (+4 dBu/-10 dBV)

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Servo-balanced inputs and outputs with ¼" TRS and gold-plated XLR connectors

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Internal switch-mode power supply (100 - 240 V~) for noise-free audio and low power consumption