irdb – KUG Impulse Response Database

The KUG irdb provides several sets of measured room impulse responses, mostly carried out in different spaces at University of Music and Performing Arts Graz.


CoS@MUMUTH Impulse Responses

These impulse responses were measured as part of the artistic research project The Choreography of Sound at MUMUTH – Haus für Musik und Musiktheater of University of Music and Performing Arts Graz.

MUMUTH is equipped with an array of 33 motorised loudspeakers, which are adjustable in height, pan and tilt. Additionally, there is the "sky", a 64-channel speaker array on the ceiling and on upper parts of the walls.

CoS impulse response measurements include all of these speakers, plus additional subwoofers and manually placed speakers for different subprojects. The main focus is on Binaural Room Impulse Responses (BRIR), but other types of microphones were also used for measuring.


CoS@MUMUTH impulse responses have been measured using the swept sine method developed by Angelo Farina. A customised version of Fons Adriaensen's measurement software Aliki has been used, along with Jack and a Supercollider helper script for the automatised multichannel routing.

The sweep length for all CoS@MUMUTH measurements is 10 s from 20 Hz to 20480 Hz logarithmically, resulting in a frequency rise of one octave per second. Additionally, there is a fade-in of 1 s and a fade-out of 0.03 s.

The recorded sweeps have been post-processed (deconvolved, exported, gain adjusted) using command line tools factored out from Aliki and Supercollider.

File format

Unless otherwise noted, CoS@MUMUTH IR sets contain the base_44 version of files, intended for further processing, incorporating the following properties:

Sampling rate: 44100 Hz
Bit depth: 32 bit floating point
Channels: mono or multichannel wav/wavex file, according to the measurement device (mono for measurement microphone, two-channel for dummy head or stereo microphone configuration, four-channel for soundfield)
One single impulse response per file for one source/speaker setup/measurement position/measuring device.
Length: approx. 3.9 s long (reverb tail safely below noisefloor)
Delay, trimming, fades: ir files are front trimmed by the measurement system latency (block and converter latency). The air travelling times from the source (speaker) to the measurement device (microphones) are preserved. No fades are applied, neither fade-in nor fade-out.
Gain: IR gains correspond to the respective gain relations in the measured setup, only a medium constant gain adjustment is applied. CAUTION: For a few extreme measurement constellations (e.g. directly in front of a speaker) the amplitude values are above 1.0 in the floating point files and clip without normalisation.

Measurement devices (microphone array)

Measurement positions

Source configurations (loudspeaker setups)


Download CoS@MUMUTH Impulse Responses

The impulse responses are available in multiple zip archives as non-overlapping sets, segmented for usability and memory efficiency. Each zip contains a basic documenting text file.

Basic hemi and sky sets

Microphone types: ab dpa kkc1 sck
Listening positions: back back2 center front offside offside2 offside3 vierdirekt
Hemi speaker layouts: hemiaux rand-b1b
No take tags in file names. (2.6 GiB) (2.7 GiB)



StiffNeck is a tool for realtime convolution in large multichannel contexts. It provides means for selecting, combining and processing impulse responses out of large sets and feeding an efficient convolution engine with these settings. It has been mainly developed for use with the CoS@MUMUTH impulse responses.



For questions and comments regarding irdb, please contact Martin Rumori <rumori(at)>.

For questions and comments regarding irdb, please contact Martin Rumori <rumori(at)>.


Inffeldgasse 10/III
8010 Graz
Tel: +43 316 389 3170
Fax: +43 316 389 3171

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