API 550 is an EQ plugin from Waves, modeled on the API 550 equalizer. It comes in two versions, 550A and 550B, for shaping tone on individual tracks, buses, or masters.
The API 550 is a Waves EQ plugin built as a re-creation of the API 550 equalizer. The developer says the original's curves were developed in close collaboration with API. Its Q changes with gain, so boosts sound more focused while cuts give gentler or steeper shaping. The plugin comes as two models, the 550A and the 550B, each with its own band layout and frequency options.
The 550A offers 5 selectable frequencies across 3 bands, plus a 50 Hz to 15 kHz filter. The 550B uses 4 overlapping EQ bands with multi-octave ranges, which gives broader control over each band.
In both models, the high and low bands switch between peak and shelving modes, so you can choose a bell-shaped boost or cut or a broader tilt at the extremes.
The plugin includes switchable analog harmonic distortion and hiss, so you can add that coloration when you want it or leave it out. A phase switch and output trim help with level matching and polarity issues after EQing.
Metering is included as well. The developer positions the 550 for general problem-solving and for sweetening, on individual tracks, buses, or full masters.
Formats, systems and requirements as listed by Plugin Boutique. Missing details are left out, not guessed.
| Developer | Waves |
|---|---|
| Type | Plugin |
| Category | EQ |
| Formats | VST2, AU, AAX |
| Operating systems | Windows, macOS |
API 550 is available in VST2, AU and AAX formats.
API 550 runs on Windows and macOS. The listed macOS versions are Monterey 12, Ventura 13, Sonoma 14 and Sequoia 15, and the listed Windows version is Windows 10 or later.
The 550A has 5 selectable frequencies across 3 bands and a 50 Hz to 15 kHz filter. The 550B has 4 overlapping EQ bands with multi-octave ranges.
