Used, Final sale, sold as is. 

Shure's DFR11EQ is a computer-controlled digital equalizer with a multitude of audio processing capabilities offered in a compact, half-rack unit. 

The DFR11EQ Solves a Variety of Problems:

Non-ideal acoustics

Insufficient gain before feedback

Irregular sound system frequency response

Harmful signal peaks that can damage amplifiers and loudspeakers

Features:

EQ - Selectable 10 bands of Parametric EQ or 1/3 OctaveGraphic EQ

Feedback Reduction - 10 precision notch filters that automatically seek out and reduce feedback

Scene Presets -10 onboard scene presets, 3 accessible from the front panel. All onboard presets can also be accessed with the DRS-10 Digital Remote Switch accessory.

Limiter and Delay