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So what is the Pultec trick all about?​

As you can see in the pictures, the Pultecs have very simple EQ controls, a High Frequency section and a low frequency section, each one with a switch for selecting the frequency we want to focus on and then a couple of knobs for boosting or cutting that particular frequency band.

The problem here is that these knobs work over the same one band that we selected on the switch, so we will need to choose between boosting or cutting, because, what would be the point of boosting and cutting the same frequency?

As counterintuitive as it might sound, this process of boosting and cutting the same low frequency band – usually 60 Hz, began to spread across engineers, since it unexpectedly delivered a tight, warm low-end. To learn more on getting better low end you should check out this free masterclass chapter from audio mixing legend Hannes Bieger.

As for why this happens, we won’t get too technical here, but it’s mostly due to the fact that the boosting and cutting circuits don’t have the exact same parameters and components. Because of that, using them at the same time creates an EQ curve that is unique and impossible to achieve by using only one of the knobs.

The Pultec EQ curve when boosting and cutting on 100 Hz