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 drawings from the API archives. It is unlike any other EQ you will ever use. Rather than offer a huge assortment of complex features, the API 550b provides exactly the right number of controls. Its four EQ bands are overlapped significantly to aid in dual roles as problem solver and sweetening device with each band offering seven switchable filter frequencies that span four-to-five octaves. These frequencies, purposely selected to be musical rather than numeric, were selected by an experienced "who's who" list of the industry's most proficient engineers. Key features: Four bands of our famous sounding equalization Each band offers seven API selected frequency centers Reciprocal and repeatable filtering 12dB of boost/cut per band EQ band 1 & 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 WARRANTY INFORMATION:PLEASE NOTE: The design or quality of any non-authorized third party service or vendor is beyond the control of API.Therefore, use of your API modules in any NON-API rack, or use of NON-API VPR Alliance modules in any API rack may VOID this warranty.Also, service or modification of any API unit except by an authorized API representative may VOID this warranty.
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