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SIR2 Reverb

SIR2 is an easy to use native audio-plugin to use for high quality reverberation. It's available for the plugin formats VST and AudioUnit. It offers zero-latency processing with low CPU-consumption and non-destructive audio processing of impulse responses. SIR2 includes high definition impulse responses (HDIR) of *real* places produced by Pinguin, Hamburg. You can also use various impulse responses from free or commercial sources.


Supported Plugin Formats:

64-bit Intel Win+Mac
"SIR2 is a truly elegant piece of software, providing a great range of general-purpose convolution facilities within a no-nonsense interface. It's relatively CPU light, requires no dongle, and I can't fault the sound quality.
However, what really sets it apart for me is that it makes working with convolution at mixdown so straightforward. As a result, it's usually first call whenever I need reverb, and if you forced me to choose just one reverb plug-in for everything in my mix, it would certainly be SIR2.

-- Mike Senior, author of Mixing Secrets For The Small Studio and Sound On Sound's 'Mix Rescue' & 'Mix Review' columns.
SIR2 Screenshot

Zero Latency processing

Usable even at pre-production stage

CPU efficient

Low CPU-spiking even with small sound-device buffers

Multi Platform

for Macintosh 32-bit/64-bit (VST/AU) & Windows 32-bit/64-bit (VST)

True Stereo Impulses included

High definition impulse responses of real places include

Fair Copy Protection

NO challenge/response - NO dongle required - license key based


imports various file formats including WAV, AIF, FLAC, BWS, OGG

Audio Samples

Classical Guitar - dry
(c) by Andreas Schulz (chief editor AKUSTIK GITARRE -
Classical Guitar - HDIR Church
(c) by Andreas Schulz (chief editor AKUSTIK GITARRE -
E-Piano - dry
E-Piano - HDIR Theater


  • Zero latency processing.
  • Low CPU-spiking even with small sound-device buffers.
  • Includes Pinguin's High Definition Impulse Responses.
  • "True Stereo" processing (a stereo convolution takes place for every source channel (left + right)).
  • Routing capabilities ( mono->mono, mono->stereo, stereo->stereo...).
  • High-quality internal sample rate converting.
  • Imports WAV, AIF, FLAC, BWS, OGG file formats.
  • Linear phase FFT-EQ.
  • Fair Copy-Protection - NO challenge/response NO Dongle required - license key based.
  • Free non-destructive amplitude envelope.
  • Free non-destructive filter envelope.
  • Pre-delay (0ms - 2000ms).
  • Stretch control (high quality re-sampling).
  • Forward / reverse switch.
  • Stereo In / Stereo IR Control.
  • Preset-managing.
  • Separate dry/wet control (-60db .. +20dB).
  • Auto-gain (automatic volume compensation).
  • Signal routing options.
  • HDIR-Direct On/Off switch.
  • "Beat-Scale"-mode.
  • If you have two stereo files, one with "L" and one with "R" at the end of the file name, you can click with right mouse button on one of the files to create a true stereo file. This is useful for third-party impulse response libraries.
  • Built in impulse-file browser (with folders).
  • Picture association.
  • Waveform Zoom.

Differences between SIR1 and SIR2

Platforms Windows Mac(VST/AU) Windows (VST)
64-bit support - X
Latency 8960 samples 0 samples
Sample-rate Conversion low quality (linear interpolation) high quality (sinc interpolation)
Import Formats WAV SIR, WAV, AIF, FLAC, BWS, OGG
Start Locater - X
HDIR-Impulses - Church, Recording Studio, Jazz Chamber, Theatre
HDIR-Direct Option - X
"True Stereo" processing - X
Preset managing - X
Pre-delay 0-300 ms 0-2000 ms
Stereo In Control 0% - 100% 0% - 150%
Stereo IR Control 0% - 100% 0% - 150%
Forward/Reverse Switch X X
Autogain X X
FFT Equalizer low quality high quality (linear phase)
Free Volume Envelope - X
Free Filter Envelope - X
Stretch low quality (linear interpolation) high quality (sinc interpolation)
Beat Scale - X
Waveform View linear logarithmic
Waveform Zoom - X
Impulse Picture - X
Price freeware see purchase info



  • Windows 7 or newer
  • 100 MB hard disk space
  • Intel Pentium 4 or better
  • VST-Host application (like Cubase, Tracktion...)


  • Mac OS 10.7 or newer
  • 100 MB hard disk space
  • Intel Processor required
  • Audio-Unit or VST compatible Host
No Dongle required


View 64bit install instructions

Please run the including installer application and follow the instructions.
After installing SIR2 will run in demo mode. The demo limitation is a periodic bell sound which will start every 10 seconds. The Impulse Response "Theatre" is disabled in demo mode.

Download Manual (PDF)

Download free impulse responses


Supported Plugin Formats:

64-bit Intel Win+Mac
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Copyright 2020 SIR Audio Tools Christian Knufinke. VST is a trademark Copyright of Steinberg Media Technologies GmbH. All other trademarks and copyrights are the property of their respective owners.