White 4700-2IQ Dual Third-Octave Equalizer

White Instruments Model 4856 Duel 1/3 Octave Equalizer, Untested

White Instruments Model 4400 Rack Mount Graphic Equalizer - Missing Some Knobs

White Instruments 4700 1/3 Octave Equalizer

ART Applied Research & Technology 172 One Third Octave Equalizer 31 band EQ 1/3

Alesis M-EQ 230 Dual 1/3 Octave Precision Equalizer

Altec Lansing 1431A 31 Band 1/3 Octave Mono Graphic rackmount Equalizer EV EQ131

BSS FCS-960 Dual Channel Mode Graphic Equalizer