Vintage EQ with API musicality and software versatility.

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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

Waves API 550A Native Features:

5 selected frequency centers per band
Reciprocal and repeatable filtering
Maximum 12 dB of boost/cut per band in 2-3 dB steps
"Proportional Q" narrows filter Q at extremes
High headroom +30 dB clip level
Up to 24-bit/192kHz resolution (TDM 24/96 only)
Mono and Stereo components
Supports TDM, RTAS, Audio Suite, VST, AU

Waves API 550A Native Specifications:

Windows
Intel Core 2 Duo 2GHz / AMD Athlon 64 or equivalent
1 GB on XP, 2 GB on Vista / Windows 7
WinXP 32-bit SP2 & SP3
Vista Business 32-bit SP1
Vista Ultimate 32-bit SP1
Windows 7 32-bit
Windows 7 64-bit (using 32 bit host applications)
1024x768 32-bit screen resolution

Mac
Core Duo 2.3Ghz
2GB RAM
OS X 10.5.8 - 10.7
1024x768 screen resolution