Buzz Audio REQ-2.2ME Resonance Equalizer, Mastering Edition
By Alan Silverman
In 1995, Tim Farrant -- Buzz Audio’s owner and lead designer -- first experienced the sound of a Neve 1073 equalizer, a classic discrete-circuitry EQ with variable frequencies, but fixed Q. Up until that point, Tim had been using an IC-based Soundcraft console with fully parametric op-amp based EQ. The difference in musicality and sound quality was a revelation: Tim decided he needed to discover why there was such a huge difference between the two equalizers, and to learn how to apply that knowledge in creating an EQ that would combine the superior sound quality of the Neve with the flexibility of a true parametric. The answer seemed to begin with the use of ferrite-core chokes, providing the needed inductance in a classic LC resonant circuit as opposed to simulating inductance with an op-amp based circuit such as a gyrator. The road to realizing a successful design was a long one, though. Eleven years later, a prototype of the REQ-2.2 was built, with two more years of refinement and debugging until the first production model was offered for sale in 2008. One of Buzz Audio's major advancements in equalization is the switching network and its capability to provide a large number of inductor/capacitor/bandwidth combinations -- all done with discrete components. More » | 
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