Lindell Audio PEQ-501A

Lindell Audio PEQ-501A: The Power of Passive EQ in your 500-Rack

In the history of audio engineering, there is no equalizer as iconic as the Pultec. The Lindell Audio PEQ-501A brings this legendary passive circuit to the modern 500-series format. Unlike active EQs, which can sometimes sound harsh or grainy, the PEQ-501A uses a passive filter design followed by a gain stage to absorb signal loss. This results in an extremely musical sound where you can boost drastically without the signal experiencing phase problems or feeling unnatural. It is the ultimate “finish” for any instrument in your mix.

Most important features

• Classic Pultec Design: Based on the EQP-1A architecture for the most natural tone control available.

• Real Inductors & Transformers: Uses high-quality components that provide that typical analog saturation and depth.

• The “Low-End Trick”: Ability to simultaneously boost AND cut the same low frequency, resulting in a unique, tight bass response with tremendous impact.

• Silky High Boost: Add “air” and definition to vocals and guitars without making the s-sounds sharp.

• Selected Frequencies: Precise stepped switches for repeatable settings during your mixing sessions.

• Hardware Bypass: Compare your processed signal directly to the original thanks to the physical bypass switch.

• Gold-Plated Connectors: For optimal signal transmission within your 500-series chassis.

Why choose the Lindell Audio PEQ-501A?

Choosing the Lindell Audio PEQ-501A is a choice for authority in your soundstage. Where a standard EQ is used to solve problems, the PEQ-501A is used to add beauty to a sound. For the professional engineer, this is the first choice on the mix bus or on key elements such as vocals and bass guitar. The way the bass is shaped gives a foundation to your mix that is difficult to reproduce with software.

At i4studio, we recommend the PEQ-501A to anyone who is serious about their hybrid setup. The module adds harmonic complexity that instantly makes your tracks sound more “expensive.” Combined with a compressor from the Lindell 500 line, you’ll build a world-class channel strip in just two slots.

Technical specifications

Frequently asked questions (FAQ)

1. What is the advantage of a passive EQ over an active one? Passive EQs such as the PEQ-501A do not use gain in the filter circuit itself. This provides a very smooth phase response, making the boosts sound much more natural and less “technical” than with a standard parametric EQ.

2. How does the famous “Low-End Trick” work on the PEQ-501A? By turning open both the “Boost” and “Attenuation” knobs at 30Hz or 60Hz, you create a unique curve that boosts the bass but at the same time cleans up the “muddy” area just above it. This gives unprecedented definition to kick drums.

3. Is the PEQ-501A also suitable for mastering? Sure. Because of its wide, musical curves, it is perfect for giving a complete mix that final analog “vibe.” For stereo use, you will need two modules.

4. Can I put this module in a Lindell 506 Power chassis? Yes, the PEQ-501A meets the VPR standard and works perfectly in any quality 500-series chassis.

5. Are the settings easy to retrieve (recall)? The PEQ-501A uses high-quality potentiometers and switches that feel consistent, which makes taking notes for recall during a later session easier.