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THE MAKING OF THE STEREO DYNAMIC SHELVING EQUALIZER

In late 2016, Jakob Erland of Gyraf Audio handed me the foundation 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, neither on the circuit or the interfacing design. 


I binned my fifth prototype build 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 for  Stephen of Marsh Mastering, including variable slopes and relay controlled frequency selection. While doing so, I found the inspiration to work on the dynamic equalization concept again, by approaching it solely as a high/low end shaping tool, and laying a completely different topology as its basis.

This time, it took off in the right direction, and the work accelerated during quarantine as a ”lock-down-project”. 

Earlier prototypes off to the landfill

WHAT IT IS

The first stage of the Stereo Dynamic Shelving Equalizer consists of a precision, high and low cut filter, each with 9 selectable frequencies, and 6, 9 and 12dB/oct. switching – all frequencies on relay-switched, precision matched capacitors.


The second stage consists of a high and low shelving filter, each sporting +/-10dB of gain, and dynamic control of the shelving – all frequencies on relay-switched, precision matched capacitors.


The dynamic control lets you vary the attack and release times, as well as the dynamic hold on the shelving filter, while the compression/limit switch. takes you from a 1:1.5 soft knee ratio, useful for subtle sculpting, to a harder knee 1:6 ratio, for a bit more bite and grab.


...and everything is on switches, for easy recall.

Relay boards with precision matched capacitors, stacked for high and low cut switching on latest prototype

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FINAL STAGE

At this point, the project has been through quite a few revisions, everything has been adjusted, and the basic design of the sonics, circuit and interface is done. 


Ill be doing some more testing before releasing it into the wild - You can follow the progress on instagram


I would love some additional feedback and "final Beta"-testing in a few random environments - I can do one or two at a discount for the purpose.

Mail me at info@goly.dk - give me two lines on your set-up, and the levels you work at, DSEQ in the subject line.



Final front panel layout

 

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