Modeled on the API's legendary 550A EQ from the late '60s, Waves API 550A plug-in for native systems provides reciprocal equalization at 15 points in 5 steps of boost divided into three overlapping ranges. The high- and low-frequency ranges are individually selectable as either peaking or shelving, and a band-pass filter can be inserted independently of all other settings. The 550A is a uniquely powerful equalizer with that one-of-a-kind API sound. Controls HF Filter Gain: -12dB to +12dB HF Filter Frequency: 5KHz, 7KHz, 10KHz, 12.5KHz and 15KHz MF Bell Filter Gain: -12dB to +12dB MF Bell Filter Frequency: 0.4KHz, 0.8KHz, 1.5KHz, 3KHz and 5KHz LF Filter Gain: -12dB to +12dB LF Filter Frequency: 50Hz, 100Hz, 200Hz, 300Hz and 400Hz Filter On/Off: 50Hz to 15KHz Band Pass Filter LF Filter Type: Low Shelf or Bell HF Filter Type: Hi Shelf or Bell EQ IN: On/Off VU Meters: -30dB to 0dB With Clip indicator Output Controls Analog: On/Off Phase Polarity Reverse: On/Off Output Gain: -18dB to +18dB Trim: Output Gain Adjustment Read more: http://www.waves.com/Content.aspx?id=3609#ixzz1ckwMVvyL