PERKINS EQ
Onyx mixers feature an enhanced 3-Band “British Style” EQ based on the same circuit used on classic mixing consoles from the ‘60s and ‘70s. This version designed by Mackie has greater filter control, minimum phase shift and allows you to pinpoint specific frequency ranges.
To create the Perkins EQ, Cal Perkins started with the Wien Bridge circuit topology inspired by the hallowed “British” desks of the ‘60s and ‘70s. This design essentially trades boost/cut capability for a wider, highly musical Q filter. After a mind-numbing amount of math, Cal was able to specify capacitor and resistor values that would give the EQ an extra 6dB of control (±15 dB) without excessively narrowing the “Q” or bandwidth of the filters. It’s what we call a win-win.