Each band features a button to toggle proportional Q on or off. It features four bands of EQ with fully variable frequency and gain controls.

Here are unprocessed versions of the three audio files … Drums Bass Guitar Īcustica Audio’s Pink2 is the ultimate channel strip for fans of API. We put some of our favorite API 550-style EQ plugins to the test on drums, bass and guitars with the following settings: Drums Now that you’re familiar with the original API 550 EQs, let’s take a look at some of the most popular emulations available today. The high and low bands on the API 550B can still be used as traditional bell shapes and converted to shelves, however, the filter was removed to make room for the additional components. API 550B EQĭecades after the release of the original 550A EQ, API redesigned this classic with an additional band, broken into the following selectable frequencies: The API 550 also features a dedicated band-pass filter set to 50 Hz and 15 kHz, which can be toggled on or off. The high and low bands can be used as traditional bell shapes or converted to shelves using two dedicated switches. Instead, it utilizes proportional Q technology, which increases the Q value as the gain is increased, creating a narrower band and a more aggressive sound.Įach band is broken into the overlapping ranges, allowing for extreme equalization: Each band can cut or boost up to 12 dB in two dB increments. The 550A features three bands of EQ, with 21 selectable frequencies. Initially released in 1971, the 550A EQ utilizes API’s legendary custom 2520 op-amp to achieve a very musical sound. In this article, we’ll break down some of the most popular API 550 EQ emulations to help you determine which one is right for you. One of their most coveted products is the 550 Series EQ. Known for their bright, open, punchy sound, API products have been used on countless hit records over the last 50 years.

API was founded in 1969 by the great Saul Walker.

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