Impulse Response Library

For Multi-User Licensing: Please contact David Fienup via the “Contact” link on this website.

****NOTE: This library was optimized for Altiverb 7, and verified in Waves IR and Space Designer. These impulses should work in any IR plug-in that allows the import of stereo WAV files, however, results may vary. All plug-ins are developed using different algorithms, and may treat these impulses in different ways.

Quick Look:
Impulses: 62
Size 72.8 MB unzipped
Format: 48k/24bit, stereo, WAV

Impulse Response Types:
- Short, medium, and long reverbs
- Delays/Echoes
- Effects

Impulse is a collection of “designed” impulse responses to expand your design palate, featuring a wide variety of metallic, wooden, glass, and icy reverbs, as well as some delays and effects. The IR included in this collection are unique “spaces” to help you take your sound design to different realms and planes of being. Why settle for just practical, real-world spaces, when you can explore the blurred lines between reality and fiction? Film, tv, and internet productions are exploring realms between conscious reality and the unknown - this library seeks to help you on those journeys.

Whether you’re looking for metallic, wooden, glassy, icy or even watery spaces – look no further. There are small, claustrophobic, metallic spaces; huge, thunderous spaces fit for a Greek god; icy castles only Superman could live in; strange delays that will have you bouncing around the room in a straight jacket; and crazy effects that will make you question your sanity.

The included track list gives short descriptions to help you find something to suite your needs. For example “Short Verb – Box Trap” is described as “Like you’re in a very reverberant, but small, bassy, wooden box.”

The Impulses
Contained in this collection are five categories of impulse responses:
Short Reverbs
Medium Reverbs
Long Reverbs

The reverbs aren’t necessarily categorized by actual length. They are grouped more by the perceived size of the space. So there are a few impulses in the “Short Reverb” group that have longer tails than some from the “Medium Reverb” group. One example is “Short Verb – The Armory”, which is 1.991 seconds long, while 6 of the 14 Medium Reverbs are shorter than this. I chose to do this because “The Armory” sounds a bit like you’re trapped in a metal tube that has a lingering metal ring to it. So the space itself is perceived to be smaller despite its length.

The Testing Phase
The Impulses in this collection were all tested using a variety of audio samples bussed through Altiverb 7. They were also tested in Waves IR1 and Space Designer. The sounds used to test the impulses included a continuous speaking voice, screams, a witch’s cackle, a drum beat, a gunshot, and thunder. Different IRs will react with different stimuli differently. Some of them worked well with shorter sounds, while others worked better with longer sounds. For example, a normal speaking voice reading a paragraph of text didn’t work very well with a very long reverb, or some of the longer delay files (or dense delays). However, screams and punches, or other short sounds, worked beautifully with the long reverbs and long/dense delays. It is up to the user to explore these impulses for themselves and their own needs.

Check out the track list for more details.

Special Thanks
Special thanks go out to those who aided in the completion of this collection.

Jeremy Schemm – Sound Designer at Another Country (Detroit), the audio division of Cutters Studios

Aram Verwoest at Audio Ease, maker of Altiverb 7

Jason Tuttle – Sound Designer/Editor at Hear Spot Bark, and Audio Engineer at Indiana Repertory Theatre