Half octave equalizer analyzer w/ sub sonic filter. Electronic crossover. Warble tone freq - 22.5, 31.5, 45, 63, 90, 125-250Hz. Adjustable bass eq - 22.5, 31.5, 45, 63, 90, 125Hz. Slide faders adjustable +/- 12dB. Low freq output level. Subsonic + Rumble Filters On/Off. External processor loop. #9 Condition.