Incorporating API's legendary circuitry the API 550b 4-band equalizer exudes that royal API blood line in every ounce of its sonic character. Artfully blending the past with the present the API 550b carries the torch from the now-classic API 550EQ — delivering just the right amount of controls to solve problems and sweeten the sound. On each of the API 550b's bands there are seven carefully selected switchable filter frequencies.

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