Convolution vs. algorithmic reverb: what's the difference?
2 min read · Updated
There are two main families of digital reverb. Convolution replays the fingerprint of a real space or a real device; algorithmic reverb computes a space with delay lines. Both have their strengths. Here is how they work and when to choose which.
In short
- Convolution: the sound of a real space or device, captured in an impulse response.
- Algorithmic: a computed space, adjustable in every direction, even beyond reality.
- Realism and specific spaces: convolution. Flexibility, modulation, effects: algorithmic.
- An IR loads from a WAV, AIFF or FLAC file.
Convolution reverb
An impulse response (IR) is a recording of how a space or a device responds to a very short sound. Convolution applies that fingerprint to your sound: the resulting reverb is that specific space, with its real reflections.
Its strengths: realism, and the ability to reproduce a space or a vintage device. Its limits: an IR is fixed. You can shorten it, filter it or reverse it, but you can't change the size of the room with a knob.
Algorithmic reverb
An algorithmic reverb simulates a space with a network of delay lines that feed the sound back and forth. Every parameter can be set freely: size, decay, density, modulation. It is light on CPU, can be modulated, and can create spaces that are impossible in reality.
It is often the best choice for vocals or synths, where you want a flattering space rather than an exact location.
Which one to choose
To place acoustic instruments in a real room, or recreate the sound of a device: convolution. For a lead vocal, pads, or a reverb that evolves or freezes: algorithmic. Many mixes use both: a short room IR for cohesion, an algorithmic plate for the vocal.
Both in one plugin
Lontana Reverb is an algorithmic reverb (8-line delay network) with five modes, Room, Hall, Plate, Ambience and Massive, a Size that can go beyond 100%, and a Freeze that holds the tail. Its IR (convolution) mode loads your own impulse responses (WAV, AIFF, FLAC) or factory IRs; Start and Length shorten the IR, Reverse flips it, and the IR is saved with the project.
Frequently asked questions
- What is an impulse response (IR)?
- A recording of how a space or a device reacts to a very short sound. A convolution reverb applies that fingerprint to your sound.
- Does convolution sound better?
- It is more realistic for reproducing a specific space. Algorithmic reverb is more flexible and often more flattering on vocals or synths. Neither is better in absolute terms.
- Which files can be loaded as an IR?
- In Lontana Reverb, WAV, AIFF or FLAC files, or the included factory IRs.
- Does a convolution reverb use more CPU?
- Generally a bit more, especially with long IRs. Recent computers run it without any trouble.
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