API 550B Discrete 4 Band EQ

API: 550b 4 Band EQ Features Four bands of our famous sounding equalization Each band offers seven API selected frequency centers Reciprocal and repeatable filtering 12 dB of boost/cut per band EQ band 1 and 4 offer shelf/peak switching "Proportional Q" narrows filter Q at extremes Traditional API fully discrete circuit design High headroom +30 dB clip level Re-issue of 1967 API 550 EQ with an extra band Based on API's original 550 from the late '60s, the API 550b is a continuation of the EQ that played a major role in the history of music recording, but with an additional filter band and several new frequencies. Incorporating API's exclusive circuitry and proprietary components (such as the legendary API 2520 Op Amp), the 550b artfully blends the past with the present. So many hit records still depend on the unique 550 sound that engineers around the world find it to be an invaluable tool. In fact, the 550b design has been taken from the original blue prints and spec control drawing