Introducing the 4K-EQ - Free SSL 4000 Console EQ for Linux

Dusk Audio’s first plugin is here.

The 4K-EQ is a native Linux plugin (LV2 & VST3) that emulates the legendary 4000 series console EQ - the sound that shaped countless hit records from the '80s through today.

What makes it different:

This isn't a basic EQ with an SSL skin. The 4K-EQ models the actual behavior of the hardware:

Brown & Black modes - Switch between E-Series and G-Series console voicings, each with their own harmonic character

Full signal path modeling - Input transformers, NE5534 op-amp behavior, output transformers (E-Series), asymmetric clipping, slew-rate limiting

Frequency-dependent saturation - Transformers saturate more at low frequencies, just like the real hardware

Drive control - Push it clean or slam it for that "console pushed hard" sound (up to 13-16x gain)

2x/4x oversampling - Clean anti-aliasing for professional results

4-band parametric EQ - LF, LMF, HMF, HF with Q controls, plus HPF and LPF

Always free. Native Linux. No Wine. No yabridge. No hassle.

Download links below. LV2 and VST3 formats included.

If you find these plugins useful, consider supporting development - your name gets added to the plugin credits, and you help me build more tools for the Linux audio community.

I have tested on Ardour and Reaper and so far so good. If you run into issues, let me know and I will make improvements along the way!

More plugins coming soon.

GLIBC_2.35 or higher is needed to run.