BEHRINGERMULTICOM PRO-XL MDX4600 Reference-Class 4-Channel Expander/Gate/Compressor/Peak Limiter with Dynamic Enhancer and Low Contour Filter Switchable IKA (Interactive Knee Adaptation) program-adaptive compression circuitry combines the advantages of hard-knee and soft-knee characteristics IRC (Interactive Ratio Control) expander/gate circuitry for virtually inaudible noise suppression Switchable dynamic Enhancer for brilliant, lively audio even with heavy compression IGC (Interactive Gain Control) peak limiting circuitry combines clipper and program limiter for reliable and inaudible protection against signal peaks Switchable Low contour filter prevents "pumping" due to low-frequency dominated compression Stereo couple function selectable for channels 1/2 and 3/4 Separate 8-segment LED meters for input/output levels and gain reduction Selectable operating level (+4 dBu/-10 dBV) Servo-balanced inputs and outputs with ¼" TRS and gold-plated XLR connectors High-quality components and exceptionally rugged construction ensure long life Conceived and designed by BEHRINGER Germany The MULTICOM PRO-XL MDX4600 gives you four channels of first-class dynamic control in a single rack space. With a multitude of new features like the advanced program-adaptive expander gate, extensive metering plus a variety of configuration options, the MULTICOM PRO-XL puts a lot of dynamic processing power in your rack.