Spring Reverb

Electronically generated audio will usually sound starkly different to acoustically generated sound. This is more-often-than-not a desirable thing, but there are times when you might want to bring the “depth” of an acoustic environment back into your mix. The obvious difference between acoustic and synthesised sounds is that acoustic instruments have resonators, and exist in reverberant spaces. One way to add depth to an electronic sound is to somehow simulate the characteristics of a space, and mix this with the orignal signal.

Reverberation can be defined as the sum of all the reflections created from an initial sound source within a space, at a point within that space, over time.

To simulate this effect we can pass a sound through a spring with two transducers at either end. As the sound propagates it will cause the spring to expand and contract, creating a series of reflections that are picked up by the transducers (along with the original sound). This creates a simulation of reverberation with (in the case of spring of the reverb) a characteristic and classic colour.


The module has two audio inputs both of which can be CV or slider controlled:
– “IN1” is routed both to “DRY” mix and reverb tank input
– “IN2” Goes only to the reverb tank

The module also has 2 outputs:
– “WET” comes straight from reverb tank
– “MIX” is the mix of DRY signal and the output of reverb tank. It has CV control

It is possible to feedback the “WET” signal back into the module via “IN2” in either a straight feedback path or after passing through other modules before returning to “IN2”.

With the “MIX” control we can control the amount of reverb and feedback in the mix while maintaining the presence of the original signal.

The module also features a high-pass filter at the input of the tank to control the colour of the reverberation and to tame saturation that may be created in the spring during feedback.

Finally there is a built-in VU meter connected to the “WET” output to visualise the level and saturation of the signal.


boton_buy_it_now boton_buy_it_now_kit

– Current needs: +12V: 51mA, -12V: 34mA
– Width: 8 HP
– Depth: 50mm (inc power connector)
– Aluminium, heat-treated front panel
– Designed, kits prepared and completed modules assembled in Barcelona
– Banana connectors available upon request
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Assembly manual | User ManualSchematics PDF | CAD/CAM files | BOM

For documentation relating to older versions of this module please contact:

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