API 550

Modeled after late 1960s legend, the API 550A EQ provides 15 point repeatable reciprocal EQ in 5 boost steps, divided into three overlapping ranges.

Its high and low frequency ranges are individually selectable as peak or shelving, and a bandpass filter can be inserted independently of all other settings.

The 550B, with its own famous four overlapping EQ bands, it is invaluable as a problem solver and sweetening device. With 7 selectable filter frequencies covering up to 5 octaves per band, the 550B's "Proportional Q" automatically widens the filter bandwidth at minimum settings and narrows at higher settings. It even lets you undo previous processing, affect or even revert tonal modifications.

With their wide range of tonal possibilities, the API 550A and 550B are a versatile EQ pair with that unique API sound.

Vintage LessModeled EQ Plugs Developed in association with API

API 550A: 5 selected frequency centers per band

API 550A: Maximum 12dB boost / band cut in 2-3 dB steps

API 550A: "Proportional Q" narrows the Q filter to extremes High headroom + 30 dB clip levelAPI 550B: 7 selected frequency centers

API 550B: 12 dB boost / cut per band

API 550B: bands 1 and 4 provide shelf / peak switching.

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