Some of the PPI DEQ 230 specs:
1/3 Octave EQ
31 Band EQ
Freq. Center (hz) 25, 31.5, 40, 50, 63, 80, 100, 126, 156, 200, 250, 320, 400, 500, 635, 800, 1k, 1.27k, 1.6k, 2k, 2.5k, 3.2k, 4k, 5k, 6.4k, 8k, 10k, 12.8k, 16k, 20k,
THD: 0.017%
S/N: 102
Max Input Voltage: 12v's
Max output Voltage: 8v's
EQ defeat switch
External adjustment from main control box
Stereo/Mono input switch
-12db attenuation switch
Gold Plated RCA inputs