API 550.
The API 550 equaliser, three bands whose Q sharpens as you boost.

Overview
Proportional-Q, by design.
The API 550 is a proportional-Q equaliser, meaning each band narrows as you push it harder. Small moves stay broad and gentle, larger ones tighten and stay musical, which is why the curves have lasted since the late 1960s. The 550A gives three bands with five selectable frequencies each plus 50 Hz and 15 kHz filters, and the 550B four overlapping bands across wider, multi-octave ranges. Analog harmonic distortion and hiss are switchable.
Highlights
Compatibility
Specs and requirements.
Licence and delivery
- Formats
- VSTVST3AUAAX NativeAAX DSP
- Licence
- Perpetual licence
- Delivery
- Instant download
- Type
- Equalization
- SKU
- 1246-2767
- Product code
- API550TDM
macOS
- OS
- 11 or later (native Apple Silicon)
- Processor
- Apple Silicon & Intel
Windows
- OS
- 10 or later (64-bit)
- Processor
- 64-bit Intel / AMD
Apple Silicon and Intel Macs are both natively supported.
About the maker
Meet Waves.
Waves Audio, founded in 1992 in Israel, is one of the world's largest developers of audio plugins and signal processors. Its catalogue spans EQs, compressors, reverbs, and vintage console emulations used across music, film, broadcast, and live sound.
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