In 2015, I had already built a few custom Porter EQs, and I started rethinking parts of the original circuit, based on the experience gathered.

To be completely honest, the original idea was to put out a scaled back, "less controls",  but "easy-to-do" version, but rather than cutting corners, I got lost in the details at every step of the processs, refining the essentials, rather than drowning it in features.

So, instead of dumbing the circuit down, it turned into a three year development and listening project, with numerous hours spent on circuit design  and countless more hours spent in front of speakers, with friends and colleagues to turn it into what it is today. 

What I have now feels like a very personal iteration of the circuit, with a new level of refinement. Still a Porter, because the parallel filter section is identical to the original design, but also, very much a Grinder, because everything else was re-engineered.

  • 2 x 4 band equalizer 

  • Six Q settings per mid band, five Q settings per low/high band

  • Shelving mode on high and low bands (switchable on the Q)

  • L-R/M-S switchable interface

  • Global bypass

  • 23 step Blore-Edwards switches for gain and Frequency control

  • Gain of  0.5dB steps and a max of 5.5dB cut or boost per band

  • Split L-R/M-S master gain

  • Matched to better than 1% relative tolerance

  • Modern, precision in- & output section

€3290 ex VAT


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