Impulse Response page from former
(last update Feb. 2011)

Custom made Impulse Responses to be used in convolution reverbs.

[sampled from gear]
TC Electronics M3000
Lexicon MPX1
[sampled from retail software]
NI Guitar Rig Reverbs
Apple Matrix Reverb
IK Multimedia Ampeg "Ambience"
[synthetized using retail software]
Impulse Modeler 5cm Boxes

[sampled from real spaces]
Bedroom Map
Rooms & Closets
Small Indoor Swimming Pool

[digital synthesis]
Laboratory - Noise Based
Chaos : the Lorenz System
Chaos : the Logistic Equation
Chaos : the Duffing Map - directional ambs.
Keyboard / Pads Specific
[analog based synthesis]
Instrument Based Impulse Responses
Speaker Echoes
[fancy/creative impulses]
Highly Colored Impulse Responses
Cymbals Impulse Responses




Read the corresponding article about impulse response authoring in
Sound on Sound magazine, Sept. 2010 edition.
Gives you most 'recipes' used in this page so you can do the same.




TC Electronics M3000 impulse responses
Sampled from the TC Electronics M3000 unit.

-- Listen to examples (mp3) : Preset 252 - Preset 354 - Preset 361

-- Download : "Top20" presets :
Wav interleaved format (zip, 12.5MB)

The impulse responses top 20 presets - supposedly a "best of". Mono to stereo.

  01 Large Warm Hall
02 Studio 40*40ft
03 Queens Arena
04 Warm cathedral
05 Singing in the Abbey
06 Stage and Hall
07 251 All Up
08 Vocal Bright
09 Space Hall
10 Overhead Mics
11 Bright Space
12 Small Wood Room
13 Band Rehearsal Room
14 RMX Snare Room
15 Bright Plate
16 Piano Plate
17 Gated Reverb
18 Empty Arena
19 Warehouse
20 The Mens Room

-- Download : 33 VSS3 presets :
Wav interleaved format (zip, 15.2MB)

Non typical, asymetrical presets. Mono to stereo.

  255 Phonebooth
256 Claustrophobia
266 Furnished Room
270 Corridor
281 Live VO Booth
282 Recording Booth
285 Dialog 1
288 Semifurnished Qtec
289 Small Foley Blue
297 Room with a View
299 Basement 1

300 Furnished Basement
305 Wide Garage
306 Right Side Garage
314 Wide Tower Inside
322 Plasterwalls
325 Basement 2
337 Empty Nightclub
343 Factory
346 Tijuana Cantina
348 Louvre Pyramid Hall
354 Mine Corridor
361 Dialog 5
369 In the Room
379 Long Swimming Pool
380 Swim Distant
381 Empty Indoor Pool
382 Frankfurt HBF
383 Budapest West Rlway Station
385 Subway Platform 1
386 Subway Platform 2
387 Subway Tunnel




Lexicon MPX1
Sampled from the Lexicon MPX1 unit.

This multi-effect unit features PitchShift, Chorus, EQ, Modulation, Delay & Reverb algorithms.

Our MPX1 impulse response set includes all presets using the EQ, Delay & Reverb algorithms.
(Impulse response capture is not able to restitute Pitch, Chorus & Modulation effects.)

-- Download the MPX1 IR set (31 presets) : Wav interleaved format (zip, 12.2MB)

All presets : 24bit 44k1, mono to stereo.

11 Dialog Booth
12 Small Booth
13 PCM60 Booth
14 Bright Room
15 Plate Space
16 Ambience4 PA
17 Short NonLin
19 Gate 4 PA
20 Plate 4 PA
21 Bright Plate

22 Vocal Plate

23 Snare Plate
24 BigDrumPlate
26 Drum Booth
28 Percus Place
31 Live Room
32 Empty Club
33 Big Studio
34 Chamber&Refl
35 Jazz Chamber
37 Big Chamber
38 Chamber 4 PA 39 Hall 4 PA
40 Small Hall
41 Medium Hall
42 Large Hall
44 Rich Hall
45 Tajma Hall
46 Small Church
47 Cathedral
48 M SQ. Garden




Impulse Modeler very small boxes (v3)
(singles & doubles)

-- Listen to examples (mp3) : single 5cm box carpet - single 5cm box concrete

Voxengo Impulse modeler is an impulse response designer - runs on Windows.

The 'single' impulse responses were generated using a square room model made of only one material, except that the room size is 5*5cm.
The result is not a reverb, but a special EQ.

The 'double' impulse responses correspond to two single impulse responses in a row. It's like playing the signal in a 5 cm box, recording it, and then playing it again in the same box. Those 'double' impulse responses are much more colored than the 'single' ones.

Those impulse responses are really useful when it comes to 'color' a given sound. Especially handy to 'differentiate' a track inside a mix. Mono to stereo.

-- Download : Impulse Modeler very small boxes, 19 singles & 19 doubles :
Wav interleaved format (zip,288kB)

Single Bright Walls
Single Carpet On Pad
Single Cement
Single Ceramic Tiles
Single Concrete Painted
Single Concrete Unpainted
Single Drapery Light
Single Glass Window
Single Gypsum Board
Single Highs Dumper
Single Marble
Single Metal
Single Plaster On Lath
Single Plaster
Single Plywood Paneling
Single Studio Material
Single Varnished Wood
Single Warm Walls
Single Wood
Double Bright Walls
Double Carpet On Pad
Double Cement
Double Ceramic Tiles
Double Concrete Painted
Double Concrete Unpainted
Double Drapery Light
Double Glass Window
Double Gypsum Board
Double Highs Dumper
Double Marble
Double Metal
Double Plaster On Lath
Double Plaster
Double Plywood Paneling
Double Studio Material
Double Varnished Wood
Double Warm Walls
Double Wood


Native Instruments Guitar Rig Reverbs

Guitar Rig is a guitar amp & effect emulator.
Amongst other effects, it includes two reverbs : the Studio Reverb & the Spring Reverb.

-- Listen to examples (mp3) :
Spring, Not Small - Spring, Reverb Shimmer
Studio, Noisy Neighbours - Studio, Small Hall

-- Download : the 13 Studio Reverb presets :
Wav interleaved format (zip, 4.4MB)

  Kents Reverb
Noisy Neighbours
Gig at the Prom

Nice Room
Long Hall
Subtle Jazz Verb
Small Hall

-- Download : the 9 Spring Reverb presets :
Wav interleaved format (zip, 11.7MB)

  Worn Down
Spongy Spring
Alien Spring
Just a Touch

Reverb Shimmer
Long Time Big Spring
Not Small



Apple AU Matrix Reverb


This reverb is included with the OSX system on Macintosh computers. It works with the Mac-only AudioUnit protocol.
The interface is minimum, but the reverb sounds quite well.

Using those impulse responses, you'll be able to get the sound of this reverb with a Windows computer or in ProTools.

-- Listen to examples (mp3) :
Medium Chamber - Large Hall - Plate

-- Download : the 13 base presets :
Wav interleaved format (zip, 6.5M)
24bit44k, mono to stereo.


IK Multimedia Ampeg "Ambience"


Ampeg is a bass amp emulator, based on the Amplitube technology.
It includes an "Ambience" function, that's simple, efficient, and would deserve to be used on its own. Here it is, to be used in convolution reverbs.

Note : the IRs don't include the actual amp emulation in any way.

-- Listen to examples (mp3) : Near - Far

Two presets only ! "Far" and "Near".

-- Download :
Wav interleaved format (zip, 352KB)
, 24bit44k, mono to stereo.




Bedroom map
64 IRs of a single bedroom

Click to enlarge.

A reverb map of a bedroom in a small Parisian flat. 64 IRs were recorded from 16 different spots in the room. As shown on the maps above that represent Reverb Time and Spectral Centroid for each IR, reverb variations between the different spots are important. The influence of the corridor on the bedroom is particularly visible.

Amongst other things, this shows that the notion of "reverb of a room" is not particularly well-defined. There is not ONE reverb for a given room. And this is a 10 sq. meter room, imagine the result with a bigger space.



Eleven "acoustic" 24bit impulse responses. Mostly non typical spaces. Mono to stereo.

-- Download :
all the mono to mono IRs, 64 files +
the 32 corresponding mono to stereo IRs (looking north and looking south) +
the 16 corresponding stereo to stereo IRs (one 4-channel IR for each position)

Wav format (zip, 9.1MB)





Domestic : rooms and closets (v2)
Inside a friend's place.

-- Listen to examples (mp3) : Rooms : toilets - Closets : bathroom closet

Eleven "acoustic" 24bit impulse responses. Mostly non typical spaces. Mono to stereo.

-- Download : domestic 6 rooms, v2 :
Wav interleaved format (zip, 940kB)
Living room (direction 1)
Living room (direction 2)
Flutter echo stairwell

-- Download : domestic 5 closets, v2 :
Wav interleaved format (zip, 712kB)
Inside the bedroom closet
From outside the bedroom closet
Inside the bathroom closet (close)
Shoe closet (close)
Shoe closet (less close)



Small indoor swimming pool

Untreated, reverberant small room with a distinct swimming pool flavour.

-- Listen to examples (mp3) : Mike position B1xy - Mike position switch 2

Eight original 24bit mono -> mono impulse rsponses, from which are made mono->stereo Eight original 24bit mono -> mono impulse responses, from which are made mono->stereo and stereo-> stereo responses.

-- Download : the 8 original mono impulse responses :
av format (zip, 1.4MB)

-- Download : 8 mono -> stereo IRs derived from the 8 mono IRs :
Wav interleaved format (zip, 2.7MB)




Laboratory impulse responses
Noise based impulse responses

Sixteen mono to stereo impulse responses generated from a pink and white noise base.

-- Listen to examples (mp3) : Pink noise faded out 1s - Slide down linear 5s

The different available impulse responses :
(click on the thumbs to get the IR sonogram)

White noise
Available reverb times : 0.5s, 1s

Pink noise
Available reverb times : 0.5s, 1s

White noise, faded out
Available reverb times : 0.5s, 1s, 2s, 5s

Pink noise, faded out
Available reverb times : 0.5s, 1s, 2s, 5s

White noise, low pass filter sliding down from 22kHz to 20Hz
Available reverb times : 5s, 10s

White noise, high pass filter sliding up from 20hz to 22kHz
Available reverb times : 5s, 10s


Dont hesitate to modify the reverb time settings for different results. Perceptive result changes greatly with reverb time.

-- Download the 16 laboratory impulse responses :
Wav interleaved format (6.8MB)



Chaos impulse responses : the Lorenz system (195 225) (v2)

-- Listen to examples (mp3) :
Lorenz dense 12 - Lorenz dense 22 - Lorenz light 02 - Lorenz light 15

Those special impulse responses are synthetised using the Lorenz chaotic oscillator.
The oscillator's X(t) variable's RMS spectrum is converted to an audio file, which is the impulse response.

The numbers "195 225" refer to the value of the Lorenz system parameter that is changed to get different IR aspects.

For the complete story :
- Lorenz oscillator study
- chaos to IR process
- the Lorenz impulse responses
- corresponding article in Sound on Sound, Sept. 2010


There are two packages : the "light" one and the "dense" one.

The "light" package is the spectrum almost as computed.
Files in the "dense" package have been compressed, giving a much denser kind of reverb.
Both are roughly 3s impulse responses.


From a perceptive point of view, those mono to stereo impulse responses are a variable mix of echoes and diffuse field.
The diffuse field is not unlike certain untreated medium sized rooms.
It also sounds a bit like the laboratory white noise based impulse responses one can find above.


Those special impulse responses are synthetised using the Lorenz chaotic oscillator.

Here are the sonograms of some of those impulse responses. It gives a good idea of what kind they are - click on the thumbnail to get the whole image :


Parameter 217.75 : almost pure delay

Parameter 206 : mix of delay and diffuse field

Parameter 195 : almost pure diffuse field


You can download those impulse responses here :


-- Download the 25 "Lorenz 195 225 light" IRs v2 :
Wav interleaved format (zip, 3.1MB)
-- Download the 25 "Lorenz 195 225 dense " IRs v2 :
Wav interleaved format (zip, 5.9MB)




Chaos impulse responses :
transition to chaos through period doubling cascade

Those impulse responses are based upon the logistic equation.

The transition from a periodic behaviour to a chaotic one translates in our case to a transition between an echo and a reverb.

See also :
- logistic equation study
- chaos to IR process

Listen to examples (mp3) :
- 250 ms IRs: preset 05 - preset 26 - preset 36
- 500 ms IRs: preset 05 - preset 26 - preset 36
- 1000 ms IRs: preset 05 - preset 26 - preset 36
- 2000 ms IRs : preset 05 - preset 36

* Principle

We take the oscillator's spectrum as a sound file. This sound file will taken as a base for the impulse response. Here is how the spectrum - and the impulse response, behaves during the doubling period cascade :

period 2
period 4
period 16
period 32
period ∞
(simple echo)
(triple echo)
(15 echos)
(31 echos)
(diffuse field)

... so we have a transition from discrete echoes to diffuse field.

* How it was done :

1. logistic equation
2. spectrum (FFT)
3. real part of the spectrum will be left, imaginary part will be right
4. the spectrum is compressed (non real time), so the harmonics / echoes are more easily heard
5. export to audio files
6. the audio files are faded out, so it doesn't sound like a gated reverb, but like a "real" one
7. optimization (left/right perceptual balance, etc.)

* Impulse responses : download

Impulse responses are 44.1kHz, 24bit, [mono to stereo].

IR length
download .wav - zip
0.25 sec
0.5 sec
1 sec
2 sec
4 sec




Chaos impulse responses :
Duffing Map Directional Ambiences

Those impulse responses are based upon the Duffing map.

A moderately chaotic behaviour around particular values of the system's parameters results in the rich and diverse ambiences featured in this set.

Most of these ambiences are "directional". This term refers to the fact that the sound clearly gives the impression of going from one channel / ear to another. In actual acoustic spaces, this can happen if one part of the room is mostly reflective or diffusing, and another part of the room mostly damped. For instance, LEDE control rooms are directional.

Listen to examples (mp3) :
- Light: preset 11 - preset 21 - preset 44
- Medium: preset 04 - preset 19 - preset 21 - preset 38
- Dense: preset 02 - preset 16 - preset 35

* Principle

The principle hereis the same as for the other so-called "chaotic impulse responses" featured on this page.

There are three sets : "light", "medium" and "dense".
Dense and medium sets are derived from the light one. Non real time dynamic compression of the impulse responses results in denser reverbs.


* Download

Impulse responses are 44.1kHz, 24bit, [mono to stereo].

download .wav - zip




Instrument based impulse responses


Impulse responses created from instrument samples.

* Note :

This is NOT the acoustic impulse response of the instrument (that could be obtained by playing a sweep at one end of the instrument for instance).
Instead, the response is derived from the instrument's spectrum.

The result is a mix of delays / diffuse field, which sound is not without connections with the original instrument's timbre.

-- Listen to examples (mp3) : Flute B2 - Trombone C2 - Oboe B2 - Viola B2


* The method :

- started from a mono instrument sample
- got the spectrum (FFT) ; this spectrum has two parts, real and imaginary
- real part is the left channel, imaginary the right channel
- compressed each channel to get a denser response (non real time compression)
- this response consists in a noisy echo, very long ; it has to be shorter for aesthetic reasons
- so, divided the spectrum into several parts ; the closer to the beginning, the more echo-like ; the closer to the end, the more diffuse.
- optimized (L/R balance, normalizing...)

All impulse responses are mono to stereo.

Proposed for 4 instruments : oboe, trombone, viola, and flute.

-- Download the 9 oboe IR set :
Wav interleaved format (zip, 1.5MB)
-- Download the 12 trombone IR set :
Wav interleaved format (zip, 3.7MB)
-- Download the 12 viola IR set :
Wav interleaved format (zip, 3.5MB)
-- Download the 12 flute IR set :

Wav interleaved format (zip, 3.8MB)


About the trombone impulse responses :

The trombone spectrum being what it is, those impulse responses are very rich in noisy high frequencies.
It may be useful to soften them using the convolution engine's integrated EQs.




Speaker Echoes (v2)


Speakers in speakers in speakers in speakers in speakers in .....

Three set of speakers, three sets of echoes : a 1 way (generic), a 2 way (Infinity) and a 3 way (Sony). The first echo is reinjected into the same speaker for the second echo, and so on. Two variants for each case : echoes based on the actual IR / echoes based on the IR made symmetrical (sounds smoother).

IR set is mono, as are the original loudspeakers.


Impulse responses are 44.1kHz, 24bit, mono to mono.

Echo time
download .wav - zip
10 ms
20 ms
50 ms
100 ms
200 ms
500 ms
1000 ms
+ Single IRs



Highly colored Impulse Responses (v2)

-- Listen to examples (mp3) : Double Closet - Mixt 2

Here the impulse responses are not supposed to resemble anything realistic : they are just designed to generate unexpected and hopefully interesting sounds.
Most of those reverbs have been used on this live show, actually on the main vocals.

Nine impulse responses, divided into three categories.
All impulse responses mono to stereo.

- category 1 : "double" impulse responses -----------------------------

Cascadings of two 100% wet identical impulse responses.
Mainly, no diffuse field - those are rather complex EQ impulse responses.


  Double Closet : two TC Electronics "Walk in Closet" presets
  Double Mine : two TC Electronics "Mine corridor" presets
  Double Erres : two "Erres Tube Radio" (Fokke Van Saane "Speakers and phones" set)
  Double Phone : two "Telephon horn T65" (Fokke Van Saane "Speakers and phones" set)
Double Plaster : two 5cm plaster rooms (that were originally made with Impulse Modeler)


- category 2 : "1cm based" impulse responses -----------------------------

Cascading of two extremely small impulse responses, then EQed.
Use only to "color" sound, no diffuse field at all.


  Glass 1cm based : two 1cm glass rooms (Impulse modeler), EQed afterwards
  Plaster 1cm based : two 1cm plaster rooms (Impulse modeler), EQed afterwards

- category 3 : "mixt" impulse responses -----------------------------

Complex EQ coloring impulse responses, but with a diffuse field as well.

+ +
Mixt 1 : Siemens Iron Speaker (Fokke van Saane)
  + Plaster on lath 5cm room (Impulse modeler)
  + 382 Frankfurt HBF (TC Electronics M3000)
+ +
Mixt 2 : Plywood paneling 5cm (Impulse modeler)
  + GRM band pass (GRM Tools plugin used as band rejecter)
  + 346 Tijuana Cantina (TC Electronics M3000)

-- Download the 9 creative impulse responses set 1 v2 :
Wav interleaved format (zip, 1.4MB)


Cymbal Impulses

-- Listen to examples (mp3) : Crash Cymbal 06 - HiHat 31 - Ride Cymbal 12

A very simple idea & technique - a cymbal sample has everything needed to make a suitable reverb : sharp attack, rich sustain, and medium-centered spectrum.

Thus those impulse responses : crash cymbals, hi-hats and ride cymbals.

Crash cymbals provide metallic and acid resonances.
Hi hats provide a variety of sounds, from wardrobe like reverbs to metallic resonances.
Ride cymbals can provide pure, almost crystal like reverberation.

All impulse responses [mono -> stereo] format, even though some responses are indeed [mono -> mono].

-- Download the 17 crash cymbal impulse responses :
Wav interleaved format (zip, 3,6MB)
-- Download the 43 hi-hat impulse responses :
Wav interleaved format (zip, 1.6MB)
-- Download the 23 ride cymbal impulse responses :
Wav interleaved format (zip, 5MB)



Sound Design : Keys & Pads specific

* What it does

Specific sound design use, not suited for general purpose as a standard reverb !!
Adds resonance and grain to static sounds, particularly suited to spacey keyboard pads.

There is a [mono -> mono] version and a [mono -> stereo] version.

The [mono -> stereo] uses the same base impulse responses for the left and right channels, with a 20ms delay and level compensing (-1.5dB on the non delayed channel).

* What it is

The impulse responses actually consist in a series of Dirac impulses, in a mostly random way but with elements of periodicity.
The overall envelope is of the damped kind.

Overall waveform view
Close waveform view

* Tips

* This is the raw impulse response. As such, it sounds a bit dirty and with a lot of high frequencies. For best results, use in conjunction with either the convolution engine's integrated EQs or an external EQ, to smooth the Diracs out.
(use the EQ as you would with the usual lo pass EQs that are always to be found in non-convolution reverbs)

* For quick stereo image widening and/or blurring, use the [mono -> stereo] version

-- Download the 40 Keys&Pads specific IRs, mono version :
Wav interleaved format (zip, 2.4MB)
-- Download the 40 Keys&Pads specific IRs, stereo version :
Wav interleaved format (zip, 5.2MB)


Version history :

March 27th, 2006 - added TCElectronics M3000 v1 - IModeler very small boxes v1 - Domestic, Rooms & Closets v1
April 14th, 2006 - added Laboratory v1
June 17th, 2006 -added Lorenz 195 225 v1
August 17th, 2006 - added Creative set 1 v1
September 1st, 2006 - added Instrumental based v1
September 11th, 2006 - added Keys&pads specific v1
September 12th, 2006 - added Creative set 2, cymbals, v1
September 15th, 2006 - upgraded Lorenz 195 225, v1 -> v2
October 3rd, 2006 - added Indoor small pool v1
October 5th, 2006 - upgraded Domestic, Rooms & Closetsv1 -> v2
October 6th, 2006 - upgraded Creative set v1 -> v2
December 15th, 2006 - added FFT 'ed Chartres Cathedral v1
December 16th, 2006 - upgraded IModeler very small boxes v1 -> v2
January 24th, 2007 - added FFT'ed EMT240 v1 - FFT'ed Caen Cathedral v1
September 2nd, 2007 - fixed compatibility problems with TCElectronics M3000 wav IRs
September 17th, 2007 - added transition to chaos through period doubling cascade v1
September 19th, 2007 - removed FFT'd spaces, following complaints from AudioEase
October 4th, 2007 - added NI Guitar Rig Reverbs v1
October 5th, 2007 - added Speaker Echoes v1
October 6th, 2007 - added Apple AU Matrix Reverb v1
October 8th, 2007 - added Lexicon MPX1 v1
January 8th, 2008 - added IK Multimedia Ampeg "Ambience" v1
January 11th, 2008 - added Duffing Map Directional Ambiences v1
January 14th, 2009 - upgraded IModeler very small boxes v2 -> v3 (singles & doubles)
February 10th, 2011 - removed Altiverb 4 SDII format, nobody uses that format anymore
February 11th, 2011 - added Bedroom Map v1
February 12th, 2011 - upgraded Speaker Echoes v1 -> v2