JSFX Bass EQ: "E-LowEndClassicEQ300" by Windows-G

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E-LowEndClassicEQ300

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The E-LowEndClassicEQ300 emulates the Pultec-style EQ curve of vintage low-end EQs by applying boost and cut in parallel. By using lower Q-factor values and parallel boost/cut processing, it gives that classic low-end enhancement without phase issues. It can be used for adding weight to kick drum or bass guitar, and shaping a muddy sub-bass. It features:

* Three Low-End EQ Modes: Two Pultec-style EQ modes plus a "HPF Q-Factor" mode:
1. Dual Shelf (Pultec-style): Uses shelf filters to boost and cut in parallel to create clean, weighty lows without phase artifacts.
2. Dual Shelf & HPF (Pultec-style): Adds a gentle high-pass filter before the shelves for enhancing clarity or tightening up sub-bass frequencies.
3. HPF Q-Factor: This utilizes a resonance-based approach to boosting lows. It's one of the experimental ways to boost your low end if you can find the sweet-spot frequency of your low end using the frequency slider
* Channel Modes: Apply equalization in stereo, mid, or side modes to target specific elements of the input signal.
* Continuous Frequency Control: Unlike vintage passive EQs with fixed bands, you can freely adjust the frequency from 10Hz to 2000Hz.
* Independent Boost and Cut Controls: Independently control the boost (0-20 dB) and cut (0-20 dB) for accurate low-end tonal shaping.
* Dry/Wet Mix Control (0–100%): Blend your processed signal with the original dry signal for parallel processing.
* Output Gain (-30dB to +30dB): Sets the final output level of the plugin to compensate for volume changes.
* GUI Bypass Button: A smooth bypass button for toggling the EQ on or off without audio clicks. Available for automation as “Bypass (Smooth)” in the parameter list.
* Zipper Noise-Free: Advanced smoothing ensures no zipper noise during slider automation and real-time adjustments.
* Light on CPU.

You can grab it for $8 on Gumroad. Visit the Gumroad page to listen to an audio demo of what the plugin can do.

Link: https://windowsg.gumroad.com/l/lowendeq300

This JSFX plugin can also be used in other DAWs through the open-source YSFX plugin. YSFX is available in VST3, AU, and CLAP formats for Windows, macOS, and Linux. Download YSFX here: https://github.com/JoepVanlier/ysfx/releases

E-LowEndClassicEQ300 (Windows-G).png
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Last edited by Windows on Wed Apr 01, 2026 8:31 pm, edited 6 times in total.

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1. Added a smooth bypass button for toggling the effect on or off without audio clicks.

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