Features
- Two-band tube equalizer: Features independent controls for low-frequency shelving and high-frequency peaking and shelving.
- The “Pultec trick”: Allows the simultaneous boost and attenuation of the same low-frequency shelf. The boost circuit has a wider Q (bandwidth) and the cut circuit a narrower one, which results in a broad boost with a gentle dip around it. This creates a tight, powerful bass sound without muddiness, which is especially popular on kick drums and bass guitars.
- Passive EQ with tube gain-makeup: The equalization is achieved through a passive, inductor-based circuit. The unit features a separate tube-driven amplifier stage to restore the signal strength lost by the passive filters, adding a unique, harmonically rich coloration.
- Independent high-frequency controls: Separate frequency selectors are available for the high-frequency boost and high-frequency shelf cut. This allows for precise high-end shaping, such as boosting a peak at 12kHz for “air” while using a shelf cut at 5kHz to tame harshness.
- Adjustable high-frequency bandwidth: The “Bandwidth” control adjusts the Q of the high-frequency boost, from a sharp, focused peak to a broader, more musical bell shape.
- Subtle but powerful sound: The EQP-1A is capable of both broad, gentle equalization and more aggressive tone shaping. It is often praised for making audio sound “better just by passing through it,” even with minimal or no EQ applied.
- Intuitive interface: Despite its unique design, the controls are simple and straightforward, facilitating a quick and musical workflow.
- Vintage components: The original and faithful reissues are built with transformers and vacuum tubes that contribute to its celebrated vintage tone.
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