Link Audio Design

SLQ51X Equalizer


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  • Step-by-Step Guide
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Classic console equalizer with new features and modern signal path.

Link Audio has recreated the classic E-series console equalizers for the 500-series. They have taken the two most popular versions of the his EQ, the Brown and Black, and added high- and low-pass filters for extra flexibility.

Brown vs Black Versions

The 4000-series consoles were packed with several different equalizer modules, which are identified by the color of the caps on the LF knobs. The Brown version was the earliest. It features +/-15dB boost/cut on each band, and is sometimes described as having a "grittier" sound than the Black. The later, Black version increased the maximum boost/cut to +/-18dB on each band. This version is known for saturating nicely when the boosts are cranked.

Full Features

  • Low-cut filter: 80 Hz (24dB/oct) – modifiable
  • Low frequency band: 30 Hz to 450 Hz – Bell or Shelf mode
  • Low-mid frequency band: 0.2kHz to 2 kHz – full Q Adjust
  • High-mid frequency band: 0.6kHz to 7kHz – full Q Adjust
  • High frequency band : 1.4kHz to 14kHz – Bell or Shelf mode
  • High-cut filter : 8 kHz (24dB/oct) – modifiable
  • Maximum 15dB of boost/cut gain per band (center detent)
  • High-quality pots (TT Electronics and Alps Alpine)
  • THAT 1246 input and THAT 1646 output stages
  • Runs on +/-16V in the 500 or in the GDIY 51X rack

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