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API 550A

Modeled on API’s late 1960’s legend, the API 550A EQ delivers a sound that has been a hallmark of high end studios for decades. It 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.

API 550B

Featuring four overlapped EQ bands, the 550B gives tracks that sweet analog sound that API is renowned for. With 7 switchable filter frequencies spanning up to 5 octaves per band, the 550B’s “Proportional Q” automatically widens the filter bandwidth at minimal settings and narrows it at higher settings. It even lets you undo previous processing, affect or even reverse tonal modifications. With its vast range of tonal possibilities, the API 550B is a versatile EQ for all your processing needs.

API 560

Based on API’s 1967 classic, the 560 10-Band Graphic Equalizer features precision filtering and massive headroom, so you can take your sound to the edge and beyond. The 560’s curve shaping potential is unmatched, while API's unique "Proportional Q" design intuitively widens the filter bandwidth at lower boost/cut levels and narrows it at higher settings. And since boost and cut characteristics are identical, previous actions can be easily undone. For precision equalization with unmatched versatility, turn to the EQ heard on top recordings for decades: the API 560.