The API Select SR24 2 Channel 4 Band EQ

The SR24 is a two channel, four band equalizer in a two rack space chassis. With a dedicated knob and/or switch for each control function, the SR24 is easy to use; by utilizing continuously variable controls for both the frequency and boost/cut, the SR24 can be very precise in applying equalization to the selected audio material.

The SR24 circuit design is deeply rooted in API’s history. From the late 1970’s to the early 1980’s, an audio company called “APSI” manufactured consoles and equalizers. Their 562 module was a 4-band, fully parametric equalizer which was designed by APSI and sold through API.

Over the last several decades, these EQ modules remained a favorite among many studio engineers, but have become increasingly difficult to find. The SR24 is a faithfully re- engineered version of the original 562, offering the user 2 channels of classic analog EQ in one rackmount unit.

Features

• 4 bands of equalization modelled 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

TECHNICAL SPECIFICATIONS -SR24

• Inputs: Balanced XLR and 1/4" parallel jacks
• Outputs: Transformer Bakanced XLR 1/4" parallel jacks (All measurements with 600 Ohm output load)
• Input Impedance: 12k Ohms
• Output Impedance: 300 Ohms transformer Balanced
• Bandwidth: +/- 0.5db, 20Hz - 20kHz
• THD+N @ 1kHz, +4dbu: 0.01%
• Maximum Level: +23dbu
• Signal-to-Noise Ratio: -100db
• EQ Band: 4 Bands, all +/-12db Peak/Dip type
• Lo: 20Hz - 200Hz
• Lo-Mid: 100Hz - 1kHz
• Hi-Mid: 500Hz - 5kHz
• Hi: 2kHz - 20kHz
• Power consumption: 10 Watts

Dimensions: 2U EIA 19" Rack

• Height: 3.5 Inches
• Width: 19 Inches
• Depth: 10 Inches
• Weight: 13 lbs