STEREO DYNAMIC SHELVING EQUALIZER

In late 2016, Jakob Erland of Gyraf Audio handed me the blue prints for a really exciting, dynamic EQ concept, but no matter which angle I approached it from, I could never mould it into a shape that was right for me. I binned my fifth revision prototype in 2018, and thought that would be the end of it. 


In 2019, I spent a lot of time perfecting a custom, precision high and low cut filter,  including variable slopes and relay controlled frequency selection. While doing so, I found the inspiration to work on the burried dynamic equalization concept again - I now approached it as a high/low end shaping tool.

This time, it took off in the right direction, and the work accelerated through tests and revisions into this final form.


Circuit

The first stage of the Stereo Dynamic Shelving Equalizer consists of a precision, high and low cut filter, each with 6 selectable frequencies, and 6, 12 and 18dB/oct. switching – all frequencies on relay-switched, precision matched capacitors.


The second stage consists of a high and low shelving filter, each sporting +/-5.5dB of gain, and dynamic control of the shelving, with 11 frequencies on relay-switched, precision matched capacitors.


The dynamic section lets you vary the attack and release times, as well as the dynamic hold on the shelving filter, while the soft/hard switch. takes you from a low, soft knee ratio, useful for subtle sculpting, to a higher, and harder knee ratio, with a high end roll off on the side chain, for a bit more bite and grab.


..and since its all done without the implementation of crossovers in the signal path, it does not suffer from any of the artifacts associated with multi-band compression.


High and Low cut filters

  • 3 slopes/6 frequencies each on each filter

  • Bypass on each filter

High and low shelving filters

  • 11 frequencies each

  • 5.5dB total gain in increments of 0.5dB on each filter

  • Dynamic control of each filter.

  • Bypass of each filter

  • 23 step Blore-Edwards switches for attack, release, gain and dynamic control

  • Hard/Soft ratio & knee selection

  • Global bypass

  • Metering displays boost, cut and dynamic movement

  • Matched to better than 1% relative tolerance

  • Modern, precision in- & output section


€3360 ex VAT

 
 

+45 53161601

ODENSE, DENMARK

©2019 by GOLY