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Aphex EQF 500 Tree-Band Equalizer 500 Series Lunchbox Module

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Aphex EQF 500 Tree-Band Equalizer 500 Series Lunchbox Module

  • Aphex EQF 500 Tree-Band Equalizer 500 Series Lunchbox Module

The Aphex EQF 500 is a 500-series three band semi-parametric EQ that includes independently selectable variable high and low pass filters. The high and low EQ bands can be switched between shelving and peaking. Illuminated buttons for all functions ensure the EQ’s state can be seen from a distance.  The output of the EQF 500 is balanced with a Jensen JT-11DL  output balancing transformer.

Aphex EQF 500 Features

  • Bands: Low: 25Hz-500Hz; Mid: 250Hz-5kHz; High: 1kHz-20kHz
  • Cut/boost: +/-12dB
  • High pass filter at 20Hz – 500Hz
  • Low pass filter at 1kHz – 20kHz


The Aphex EQF 500 reissue is our modern take on the classic Aphex EQF-2 500 series equalizer, originally developed around 1976.

The EQF-1 and EQF-2 were designed for the API modular consoles.. Aphex built the very first EQF-1 by hand, which led to a limited production run. The EQF-2 was then designed to include shelving EQ for the high and low bands. History shows that the EQF-1 and EQF-2 were some of the very first 500 series modules released that were not made by API.

Fast forward to 2012 and the classic EQF-1 and EQF-2 modules continue to be highly sought after by 500 series enthusiasts. The EQF 500 mixes a classic design with improved control layout and modern components for high headroom and low noise.

Aphex EQF 500 Specifications


  • Type: Transformerless, active balanced
  • Impedance: 40KΩ
  • Unbalanced: 20KΩ
  • Nominal Level: +4dBu
  • Maximum Level: +24dBu
  • CMRR: >40dB 


  • Impedance: 110Ω
  • Nominal Level: +4dBu
  • Maximum Level: +24dBu Unloaded


  • Frequency Response: +0.5dB 10Hz-38KHz
  • Dynamic Range: 120dB
  • THD 10Hz – 22kHz @ max output: 0.0003
  • IMD 10Hz – 22kHz 0 max output: 0.0007
Manufacturer Aphex
Model Aphex EQF 500
Aphex EQF 500
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