It also allows the user to select how broad of a curve they would be affecting via the bandwidth knob and what frequency the high shelf attenuation is set at via the attenuation select knob. The control panel is rather simplistic, featuring a boost, attenuate, and frequency selection knob for each of the two bands. The EQP-1a is a two-band program equalizer that uses broad curves and shelving to achieve its frequency changes. Since the EQP-1a, many equalizers have used this type of design to keep signal at its intended level. Many equalizers of the time had a tendency to output roughly 20dB down from the level of the input signal.

This EQ, outside of the sounds you can get out of it, was revolutionary for the use of an amplification stage at the end of the circuit. Designed in the early 1950s by Eugene Shenk, the Pultec was created for one of the company’s longtime friends who commissioned the company to build a mastering equalizer for a new studio he was putting together at MGM. Pultec has been known to have a few of those types of units, and among them is the EQP-1a. In every product category, there are always a few pieces of gear that stand out and make a name for themselves. Whether it be a subtle shift or a major cut that you are after, the EQs below are among the best in the business and suited for this kind of work. Many engineers utilize these still when they are seeking the coloration and particular sound they are after for their mixes and masters. While these types of equalization offer quick and accessible ways to tune your mix, it is worth considering the days gone by, when analog processors were the only way to achieve the desired result. Most systems include at least one or two different types of EQ to help make the required changes to your mixes and masters, and those systems often allow for third-party EQ plugins to be loaded as well. In today’s world of audio, DAWs have provided every engineer with simple ways to correct frequency issues.

As engineers, we rely heavily on our ability to alter and affect the sounds we record and one of the biggest ways we can achieve this is through the use of an EQ. Imagine if you could not roll out the undesirable rumble of a muddy vocal, or if you were not able to tame the mid-range on a bright guitar signal. What would an engineer do without a proper equalizer? It is a really hard question to answer in the age of HiFi systems and affordable access to great sound.

Stereo equalizer