Acousticas documents the science and craft of convolution reverb, impulse response capture, and acoustic design. From the Lexicon 480L to cathedral interiors, we preserve the reverberant character of legendary hardware and extraordinary rooms.
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The technology that lets any room live inside your DAW.
711 impulse responses from the reverb that defined a generation.
Stimulus signals, microphone placement, and post-processing.
When the room becomes the instrument.
2,112 stereo impulses from a digital reverb legend.
The technology that lets any room live inside your DAW.
711 impulse responses from the reverb that defined a generation.
Stimulus signals, microphone placement, and post-processing.
When the room becomes the instrument.
2,112 stereo impulses from a digital reverb legend.
Convolution reverb is a technique that uses a recorded impulse response (IR) to recreate the exact acoustic signature of a physical space or piece of hardware. Play a short burst of sound in a cathedral, record how the room responds, and that recording becomes a filter your DAW can apply to any audio signal.
The result is indistinguishable from recording in the actual space. Vocals get the reverb of a concert hall. Drums inherit the character of a Lexicon 480L. Guitars bloom in a chamber that was demolished decades ago.
Acousticas has been capturing, cataloguing, and documenting these impulse responses since 2009.
Capturing a clean impulse response requires a stimulus signal loud enough to excite the space without distortion, a microphone positioned to catch the full decay, and hours of post-processing to remove noise and normalize the result.
For hardware units like the Lexicon 224XL, the challenge is greater. Custom stimulus signals must be designed to work with the unit's converters. A single library can take two months of recording and processing to complete.
Every IR in our archive was recorded with analog signal paths, not digital bypass, preserving the character of the hardware's converters and circuitry.
The studio standard. Factory presets, plates, churches, chambers, and the Stereo Maker algorithm.
The Tinker Bell. Every setting the 252, 250, NON-LIN, and D-REV have to offer.
Seven categories, two months of work.
Up to 64.1 seconds of decay.

Real acoustic spaces, captured with sine sweeps and deconvolved to pristine stereo IRs.
Altiverb, IR1, Revolver, Space Designer, TL-Space.

How impulse responses work, why they sound better than algorithmic reverb, and how to use them in your productions.
Continue reading →Inside the 711-impulse library that captures every preset, plate, and chamber of the legendary reverb.
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Stimulus signals, microphone placement, deconvolution, and the pitfalls that ruin a good IR.
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Why egg-crate foam is not enough, and what actually works for controlling reflections in a studio.
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When reverb times exceed six seconds, the room stops being an effect and becomes a performer.
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2,112 stereo impulses from the digital reverb that changed how we think about space.
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What RT60 actually measures, why a single number cannot describe a room, and how to read a reverb curve.
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Monitor placement, acoustic treatment, and the gear that actually matters for recording at home.
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The EMT 140, the BX-20, and why a sheet of metal still sounds better than any plugin.
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"The room is the first instrument. Everything you record has already been processed by the space it was played in. Convolution just lets you change your mind about which room."Acousticas Field Notes, Vol. 03
We document acoustic spaces and hardware reverbs. If you have access to a unique room or a piece of vintage gear, we want to hear about it.