API Discrete Classic 3 Band EQ Module - Long & McQuade Music Educator Site
Proudly Canadian since 1956  Canadian Flag
  Main Menu

API Discrete Classic 3 Band EQ Module

Departments > Pro Audio & Recording > Signal Processors > Effects - EQ > API > Discrete Classic 3 Band EQ Module
Add to Wish List
SKU: # 219107
Model: #

550A

Online

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

Few equalizers 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 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 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 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.

This is THAT sound0 of 1 customers found this review helpful

FeaturesProduct ratingProduct ratingProduct ratingProduct ratingProduct rating
QualityProduct ratingProduct ratingProduct ratingProduct ratingProduct rating
ValueProduct ratingProduct ratingProduct ratingProduct ratingProduct rating
OverallProduct ratingProduct ratingProduct ratingProduct ratingProduct rating
Product ExperienceI own it
Closest StoreCalgary Chinook, Alberta
Simply amazing. It is that sound I wanted. Really easy to operate and improve virtually any sound source. It does color the sound wonderfully so maybe not the best EQ for those looking for no coloring of the sound. Really really happy with this purchase and will get another soon.
Posted by Daryl on Oct 28, 2014
Was this review helpful?    flag review