The reference-class MDX4600 is a marvelous 4-channel Expander/Gate/Compressor/Peak Limiter that is ideal for: compressing mono/stereo signals and providing virtually inaudible noise suppression, without loss of high frequencies; increasing vocal presence and energy; and limiting, or smoothing out extremely-high signal peaks. Additionally, the MDX4600 features an integrated Dynamic Enhancer and Low-Contour filter to provide the ultimate in signal enrichment. Put simply, the MDX4600 can do amazing things for your vocals or instruments Ð providing virtually everything you need for studio-quality dynamics processing! ¥ 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 _" TRS and gold-plated XLR connectors ¥ Internal switch-mode power supply (100 - 240 V~) for noise-free audio and low power consumption ¥ Designed and engineered in Germany