Samson DE-2500 Dual 31 Band Graphic EQ / Feedback Management System.

Champion Sound Euaulizer 31-band DSP Audio Digital Equalizer 1U (Black)

Alto EQU215 Dual 15 Band Graphic Equalizer Rack Mount EQ with Selectable Range

SAMSON D-1500 Digital 31-Band Real Time Audio Analyzer

Rane RA27 Realtime Spectrum Analyzer w/ Mic

Logitek Super-VU 5.1 Audio Meter SV51-A Analog Dorrough

WOHLER AMP2-V2DA Analog/ Digital Audio Monitor - Rack mount

Samson E30, 2/3 Octave Stereo 15 Band Graphic Equalizer, Rack Mounting