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Few equalisers enjoy the respect and admiration of the coveted API 550A. Designed by the now legendary Saul Walker in the late 60’s, the discrete 550A was first used as a modular OEM equaliser.As the industry rapidly embraced the sonic quality of the 550A, it quickly found it’s way into many custom console designs by Frank DeMedio and other leading engineers. Many of these consoles are still in use today.Forty years later, the 550A remains the standard against which other EQ’s are measured, and it has played a major role in the recording industry for decades.Still copied but never duplicated, the 550A became API’s standard channel module EQ when the company began manufacturing consoles in 1971. With virtually all existing units spoken for, popular demand for this EQ resulted in API finally resuming production in 2004.The 550A provides reciprocal equalisation at 15 points in 5 steps of boost to a maximum of 12dB of gain at each point. The fifteen equalisation points are divided into three overlapping ranges. The high and low frequency ranges are individually selectable as either peaking or shelving, and a band-pass filter may be inserted independently of all other selected equalisation settings.Frequency ranges and boost/cut are selected by three dual-concentric switches, and a pushbutton “in” switch allows the EQ to be silently introduced to the signal path. A small toggle switch is used to insert the band-pass filter into the 550A.The combination of Walker’s incomparable 2520 op amp, and his “Proportional Q” circuitry gives the 550A user an uncomplicated way to generate acoustically superior equalisation.
This is for one unit only. The other items shown in the images are not included in this auction, but please see my other auction for the other unit.In great, fully working condition. Comes from a clean, non-smoking environment. The date of manufacture is around 2006.I reserve the right to cancel any bid from an account with a feedback score of less than 10
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Category: Musical Instruments:Pro Audio Equipment:Signal Processors and Effects
Location: Manchester