The most powerful passive EQ ever.
Made by Brainworx in cooperation with SPL.

The original hardware Passeq was the first passive EQ to provide three separate frequency ranges for boosting and cutting. The Pultec EQ, the famous passive EQ from the 1950’s and 60’s, featured just two frequency bands and had very limited switchable frequencies.

SPL’s Passeq has 12 switchable frequencies per band, totaling 36 boost and 36 cut frequencies! Boost and cut frequencies are NOT identical, thus the resultant 72 frequencies per channel offer an enormous choice for the most elaborate EQ curves. The Passeq offers, for the first time, passive filter control possibilities with an unheard of abundance of filter choices.

The plugin faithfully reproduces the unique sound characteristics of the original hardware Passeq. All the complex interactions between each single filter are faithfully preserved in every detail.

One of the unique qualities of passive EQ designs is that the audio signal reacts to the multiple bands as one big filter network. Whenever a setting changes, the entire interaction between EQ bands occurs. This provides the unique characteristics and very special sound of these EQs - something that simply does not happen with active EQ designs.

The combination of all this filtering power, mastering grade sonic quality, and advanced M/S processing make the SPL Passeq THE plugin to have for mix busses and mastering. Its 10Hz Sub Band and the 16kHz Top band sound truly mesmerizing.


  • Includes 2 Plugins: standard stereo and a mono version for individual tracks
  • M/S processing on board
  • Faithful reproduction of the original hardware’s beautiful-sounding interactions between passive filters.
  • 72 filters on six bands per channel.
  • Emulation of input and output transformers

Audio Examples

Customer Reviews

  • Just do it !

    by Jaff
    I use this guy for my mastering session and in M/S, this boy does the job pretty well ! And it gives this analog-mojo we've all expected from a master
  • Interesting and useful EQ

    by Aidan Brock
    This EQ sounds very nice and having separate options for boost/cut and L/R or M/S is great functionality. Doesn't always work on everything, but when it does, it does. Layout of the controls can be a… Read More
  • passeq

    by Allister Whitehead
    You don't need to add much bass to get that all important oomph required for a dance track, cleanish and big. The mid section sounds solid and rich without any +DB. The top end adds a subtle sheen… Read More
  • PassEQ

    by JimHam70
    SPL makes some great products. This is one of them. It's like having a Pultec on steroids. Put the MEQ-5 & the EQP-1A together, add M/S and a few more bells & whistles and you'll have the PassEQ.… Read More
  • Passeq

    by John DeLorme
    I have never used the Passeq hardware unit, but I have used many a passive hardware EQ's. True to their form, this digitally modeled passive EQ is super smooth and sounds awesome. I love the top and… Read More


Supported Plugin Formats
AAX DSP, AAX Native, AU, AAX AudioSuite, Venue 32-bit, VST2, VST3

Supported Operating Systems
Mac OS X 10.9 through 10.13
Windows 7 through 10
Pro Tools 10.3.10 or higher or most VST/VST3/AU-compatible hosts running on a supported operating system

Intel CPU only (minimum 2 GHz recommended)

Intel-compatible CPU with SSE2 instruction set (Pentium 4 compatible or higher; minimum 2 GHz recommended)

System Requirements
Display resolution: 1440 × 900px or 1280 × 960px or higher
Memory: 2 GB RAM