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API Select SR24 Dual-Channel Equalizer

Dual channel EQ featuring 4 bands of equalization modeled after the classic APSI model 562 EQ with each band offering continuously variable control of frequency and gain, using separate knobs

Product Description

The API Select SR24 is a two-channel four-band equalizer that fits into a two rack-space chassis. With a variety of dedicated knobs and switches for each function, the SR24 dual channel EQ is easy to use. By utilizing the continuously-variable controls for boosting and cutting frequencies, the API SR24 can be extremely precise when working with audio tracks.

The SR24 dual-channel parametric EQ is a workhorse with a storied lineage. The circuitry is based on the APSI 562, which was created by a small company called APSI and distributed by API. Though APSI was a minor player in the pro audio world, their 562 equalizers became a favorite for many recording studio engineers through its simplicity and versatility. 

With the SR24, API has faithfully modeled this beloved EQ and re-engineered it for overall improved performance. This EQ offers four bands of continuously variable EQs, which gives users precise control for a 20Hz to 20kHz range with +/-12dB of boost and cut on each band. The EQ is surgical and transparent to the tone of a signal without adding any additional character. The SR24 delivers the quality expected from API at an affordable price!


The SR24 EQ’s circuit design has been deeply rooted in API’s history. The EQ was designed by APSI and sold through API are proven to be powerful and reliable. Over the last several decades, these equalizer modules remain a staple for engineers, but have become increasingly difficult to find. The SR24 is a faithful re-engineering of the original 562, offering any user two channels of a classic analog EQ in one rack-mount unit.


  • 4 bands of equalization modeled after the classic APSI model 562 EQ
  • Each band offers continuously variable control of frequency and gain, using separate knobs
  • 12 dB of boost/cut per band
  • All 4 bands are peak/dipping parametric configuration
  • Custom transformer balanced output
  • Fully balanced ¼” and XLR input and output
  • Massive headroom +24 dB clip level
  • Comparable to Solid State Logic EQs with mic preamplifier capabilities

Product Specifications

Condition New
Channels Dual-Channel
Chassis 19-inch Rack-mount
Rack Spaces 2U
Input Connectors 1/4-inch TRS, Analog XLR
Output Connectors 1/4-inch TRS, Analog XLR
EQ Type Parametric

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I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
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The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
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