Available currencies
American dollar     Canadian dollar     European Euro
Current settings :
American dollar
Site Web français
Start search
You are here : Homepage
Related Items
API 550B
API 550B
A-Designs EM-PEQ
A-Designs EM-PEQ
A-Designs 500HR
A-Designs 500HR
API 500-6B
API 500-6B
For sale
List Price : 1195.00 US
Our Price : 1015.00 US
Free shipping in Canada *
Add to cart
Rental prices ($USD)
  / day Total
1 day 29.15 29.15
3 day 19.43 58.29
5 day 14.57 72.85
12 day 9.72 116.64
28 day 6.27 175.56
For more information
API
Visit API's website
View all products from API available for sale

API 550A



The API 550A has been designed by the now legendary Saul Walker in the late 60's, the discrete 550A was first used as a modular OEM equalizer. 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 API 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 API 550A provides reciprocal equalization at 15 points in 5 steps of boost to a maximum of 12dB of gain at each point. The fifteen equalization 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 equalization 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 equalization.

With the long-awaited reissue of this unit, an EQ that has had such a part in the history of recording is continuing to make history in today's music.


API 550A's features

  • 3 bands of classic API equalization
  • Each band offers 5 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

  • Studio Economik UA Apollo NEWS! We are placing the 1rst order for UA Apollo right now, available end February. Limited quantity available on first shipment. Pre-orders available. Please contact us to get yours!
    February 1 at 11:14am
    Studio Economik The new RME FIREFACE UCX, available now!
    RME Fireface UCX
    January 27 at 11:29am
    Neumann KM 184 Stereo Set
    Follow Studio Economik on Twitter
    Rupert Neve Designs
    * Shipping free for new equipment only
    Leasing
    available