The XR4400 gives you four frequency-selective UTR expanders/noise gates in a single rack space without compromising on functionality. The side chains parametric filters allow you to fine-tune control signals so that the gate reacts only when you want it

Four separate expander/gate circuits
IRC expander/UTR gate circuitries
Extremely short attack time (<10 sec.)
Parametric side chain filter with monitor function
Independent hold and release controls for flexible envelope shaping
Maximum attenuation 80 dB
FlexLink system for flexible master/slave configurations
"Traffic light" display for threshold working point and gain reduction display