Along with the Fairchild 670, the most hallowed of all studio equipment. Apparently, if you have an original one of these a holy presence descends upon your board.
The Pultec EQP 1-A can both boost and attenuate the low frequency band at the same time. Wait, what? How does this make any sense (you may ask)? Because of the original circuitry the width and curve of each of these varies, which creates an amazing “trick.” Scroll down for a look at how the this works.
Attenuation + boost!
Here is an example of how the ‘trick’ works. In the chart below, the low frequency is set to 100; Low boost is set to 4, low attenuation is set to 9. Pretty cool. No wonder people have loved this for decades. But why not just use a “real” EQ and do this? Because this is great fun and sounds so smooth, and don’t be such a sourpuss.
- Change the low frequency setting and the curve will move lower. For instance, at 30 the dip is around 200hZ. Changing the attenuation not only changes the amount of eq, it slightly slips the frequency around as well.