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API 550A Equaliser

API 550A Classic Equaliser (EQ)

The legendary 550A 500-series equaliser remains the standard against which other EQ's are measured, and it has played a major role in the recording industry for decades.


Hire Rates:

Day Rate: $35
Weekend Rate: $45
Week Rate: $75

2 in stock for hire


Purchase Price:

$1,589.00 $1,395.00

Only 2 left in stock (also available on backorder)

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Product Description

Designed by the now-legendary Saul Walker in the late ’60s, the 550A was first used as a modular OEM equaliser. 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.

  • 3 bands of classic API equalisation
  • Each band offers 7 API selected frequency centers
  • Reciprocal and repeatable filtering
  • Maximum 12 dB of boost/cut per band
  • EQ Band 1 and 3 offer shelf/peak switching
  • “Proportional Q” narrows filter Q at extremes
  • Traditional API fully discrete circuit design
  • High headroom +30 dB clip level