By controlling the dynamics of two frequency bands separately, the dbx 565 dual-band optical compressor puts excellent sound-shaping options in your hands, both for live sound and studio applications. The 565 utilizes a Linkwitz-Riley 4th-order (24dB/octave) crossover slope and a 16-stage frequency selector in addition to independent Compression, Attack, and Release controls for each band. An analog VU meter and LED gain reduction display lets you keep a dutiful eye on your levels. Your 500 Series rack is missing something – the dbx 565 dual-band optical compressor!