The equalization stage has a solid-state design and a very tight response to frequency. This can be attributed to the Baxandall-type high shelf EO centered around 12 kHz and a low shelf EO centered around 90 Hz. Inherent in this type of EO circuitry is the ability to make changes to specific frequency ranges without altering the tone of adjacent ranges within the spectrum. For example, if you boost using the high shelf on the EO stage, you can be sure that the rest of the bandwidth will remain intact even with high amounts of boost and cut. [Manley] does an incredible job of implementing this circuitry. For the mid frequencies, we have a bell shaped curve with a selectable range of 100 Hz to 1 kHz or 1 kHz to 10 kHz with lOdB boost and cut. Using the frequency knob,you can easily sweep through the selected range. It's a very valuable addition to this tool that will help shape sound while tracking or after the fact.
Mullen, Joe (2014) Manley Core Reference Channel Strip Review. In: Professional Sound, Vol. 25, No. 6, pp. 26. Available at https://openmusiclibrary.org/article/847564/.