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EQ Plugin by RNDigital Labs
No Longer Available
FIREQ / FIREQ LE by RNDigital Labs is a Virtual Effect Audio Plugin for macOS and Windows. It functions as a VST Plugin, an Audio Units Plugin and an RTAS Plugin.
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FIREQ is a 1/6th octave stereo finite impulse response (FIR) mastering equalizer with linear phase characteristics.

FIREQ provides transparent results, without non-linear phase shift or smearing of your audio. Improvements over RNDigital's Frequal-izer (that it replaces) include 62 EQ bands with gain/reduction of +/- 27 Db per band-for precise frequency tailoring, an overall output gain/reduction range of +/- 24Db, and a larger, easy to read interface.

Extensive editing of your EQ curve is achieved by dragging the fixed control points, or by drawing a freehand curve. Scaling or smoothing of your settings are easy with the click of your mouse. With FIREQ's Match function you can learn the spectral characteristics of one audio source and apply it to another. Matching creates continuity between individual tracks, or entire mixes. Using FIREQ's States, 50 different EQ snapshots can be stored, copied, moved, deleted, recalled and saved for automation.



  • Linear phase mastering EQ.
  • 62 Bands.
  • +/- 27 db cut and boost.
  • Supports sampling rates up to 192 kHz.
  • Spectrum Matching.
  • Automation support (using States).
  • Work with each channel individually.
  • Four channel linking modes:
    • Lock - edit the left and right together.
    • Weak - edits to one channel cause a similar change on other.
    • Strong - edits to one channel cause identical change on other.
    • None - no relationship between channels.
    • Reverse - edits to one channel cause a reverse effect on the other (used with Weak or Strong).
  • Dynamically change the width of an EQ curve.
  • Output peak hold meters with clip indicators.
  • Output trim fader with +/- 24 dB boost/cut.
  • Altivec/Velocity engine optimizations.


  • Built-in spectrum analyzer (with pause).
  • States overview display.
  • Draw EQ curve freehand or by dragging one of fifty control points.
  • Large, customizable frequency response display:
    • Show input/output, both or neither; turn control points off/on.
    • Show/hide inactive channel.
  • Control coupling display to visualize and select how changes to one control point will affect nearby points.
  • History slider to easily browse and compare prior EQs.
  • Curve smooth slider.
  • Curve scale slider.
  • Shift entire EQ curve in frequency or gain.
  • Curve invert.
  • Clear/zero an EQ.
  • Zoom in to +/- 8dB.


  • Integrated SAVE and LOAD.
  • Two workspaces.
  • Copy settings to other workspace or completely clear them.
  • Plug-In formats supported:
    • Mac OS X Power PC and Intel: VST, Audio Unit (AU), RTAS.
    • Windows Vista and XP: VST, RTAS.

FIREQ LE is a 1/3rd octave stereo finite impulse response (FIR) mastering equalizer with linear phase characteristics. This new equalizer from RNDigital incorporates the same filter characteristics of FIREQ, but does not allow for spectral matching or the use of states. The layout of the FIREQ LE includes 31eq bands with gain/reduction of +/- 27 Db per band, freehand curve drawing, extensive history, left/right channel linking and editing, a detailed customizable spectral display, two workspaces and an overall output gain/reduction range of +/- 24Db.

Latest User Reviews

Average user rating of 5.00 from 2 reviews

Reviewed By multree
December 21st, 2003

Firium - the Adobe Photoshop of plugin eq's. What we have here is a linear phase equalizer with the ability to draw the eq curve and process the left and right channel separately, or even oppositional. So you can be sure that your mixes won't suffer from ugly sounding phase distortion. It delivers a sound colour that is very hard to beat, for you won't find it. The processed audio file still sounds so natural and only very extreme settings could change this.

A very helpful and simply unique feature to the Firium is the ability to match the sound of two audio files. First you load the source file (the one with the desired sound) and let Firium analyze its eq curve, then you load the target sound file (which should be manipulated) and let Firium do the same. Once Firium knows the eq curves of both audio files it can slip the source characteristic over the target file. This feature can be very helpful during the master process, when you want to have a consistent sound.

the Firium sounds invisibly awesome and is easy to set up. The documentation is good and extensive, and you won't find a better mastering eq with this sound and functionality (at least this will be a hard task). The little helper has grown up.
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Reviewed By Funkybot
October 20th, 2003

Firium is a linear phase EQ, which means two very important things: the first being that it makes it an insanely clear and transparent EQ as it is not adding any phase distortion to the signal, and the second is that it introduces quite a bit of latency, making it a less than perfect track EQ. Well where does this you? If your host doesn't support delay comp you're still left with the perfect mastering EQ. Is it that good? Yes. I defy you to listen to Firium and not be impressed with the sound. Curves are drawn in by hand, so as far as ease of use goes, this would be a hard EQ to beat. Secondly, Firium includes a spectrum analyzer in the GUI which allows you to spot out problem points in your mixes quickly, and also allows you to see how your EQ adjustments are effecting your mix. This is just an unbelievably clean, transparent, and sweet mastering EQ that bears no faults whatsoever in that task. Buy this EQ, and sound better. It's that simple.
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