Few equalizers enjoy the respect and admiration of the coveted API 550A. Designed by the now-legendary Saul Walker in the late ’60s, 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 its 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 EQs 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 21 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.
Features:
- 3 bands of classic API equalization
- 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
Fast shipping and professional packing
Because of our long-standing relationship with UPS FedEx DHL, and other major global carriers, we are able provide various shipping options. Our warehouse personnel will pack each item according to our strict specifications. Prior to shipping the goods are thoroughly inspected and secured. Every day we ship hundreds of packages to our customers across many countries. The fact that we're dedicated to becoming the largest online retailer in the world is evident. The warehouses and centers of distribution are in Europe and the USA.
Note that orders containing more than one item are processed according to the particular item.
We will inspect each and every one of the products before they are shipped. Today, the majority orders will be shipped within 48 hours. The delivery time will be between 3-7 working days.
Returns
The stock market is always changing. It's not entirely managed by us, since we are involved with multiple organizations, such as the factory and the storage. The actual levels of stock can change at any time. Please understand it may happen that your order is out of stock when the order has been placed.
Our policy runs for a period of 30 days. However, if the 30 days have elapsed from the date you purchased the product, we are unable to give you a refund or exchange.
For your item to be eligible for return, it must be unopened and in the condition you received it in. It should also be in the original packaging.
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