The RO-SPR is an authentically modeled vintage spring reverb that adds character and just the right amount of psychedelic flair to your productions. Experience the iconic sound of Hendrix & co. with its 6 spring types, a three-band EQ, as well as spring length and mode control.
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Compatible with
AAX plugin support VST plugin supprt Audio Unit plugin support

Vintage Spring Reverb RO-SPR

A Sonic Revolution

The RO-SPR is a vintage spring reverb with six different spring types, bass cut, a three-band EQ, as well as spring length and mode control, for the ultimate customizable reverb unit.

It was the year 1939, when Laurens Hammond applied for the first patent of an innovative, synthetic reverberation unit, that was about to revolutionize the sound of recorded music. With a simple transducer at one end of a metal spring, and a pickup at the other.

Mr. Hammond further implemented his idea of a mechanical, spring-based hall processor, that found its way into the legendary Hammond organs (from 1960), as well as into standalone hardware units like the Accusonics Type 4 SR. Leo Fender made the concept famous, with his introduction of the 1963 Fender Vibroverb.

The Spring Reverb is one of the most used hardware reverbs in studio history, but unlike bulky plate reverbs that could easily cost thousands of dollars, and weighed around 600 pounds each, most spring reverbs are more space- and cost-efficient.

Soundwise, spring reverbs are often described as being ‘bouncy’ or ‘ringy’, due to their mechanical layout, which tends to be low-end heavy. The spectrum used to be corrected by an EQ to maintain a natural room feel - yet many mix engineers used that exact low-end boost to add to their guitar, vocal, or synth tone. This sound design trick, combined with the renowned characteristics of a spring can be heard across many hit records - from The Doors to Queens Of The Stone Age.

The RO-SPR will throw you back in time with its very unique collection of classic spring types, while adding modern-day features to tailor each section precisely to your needs.

Add that vintage spring sound to your guitar, bass, vocal, drum, brass or synth tracks, or try it on any bus or mix channel. The result is a familiar, yet mysteriously mechanical roomy reverb that you’ll love!

RO-SPR Spring Reverb Plug-in Frontplate

"This is something that's always lacking when mixing vintage style guitars. RO-SPR brings the color and liveliness like no other spring reverb plug-in I have. I literally feel those springs moving.
TIP: try placing it in front of the amp."

Igor Korzhov

Producer/Mix Engineer
Igor Korzhov

From Psychedelic Tones To Surf Tunes

Mechanical Reverb Emulation

The RO-SPR comes with SIX spring types, each with its own hall, frequency response, and harmonic range. The various options spread from 1960s units to modern day springs, giving you that authentic analog feel.
The RO-SPR boasts a comprehensive 3-band equalizer, with three carefully chosen frequency ranges that give you even more control over your custom spring sound. Another Black Rooster Audio twist incorporated into this release to expand on the original hardware unit.
The very unique mono/stereo options that are implemented in the RO-SPR allow for you to create stunning room effects. You can go from the well-known surf sound to a psychedelic space reverb that will fuel your imagination.

Audio examples

Audio samples of RO-SPR Plug-In
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Plug-In Features

All Black Rooster Audio plug-ins are designed for high-performance and authenticity.

6 Spring Types

The RO-SPR comes with 6 very unique spring types that have been faithfully modeled after their hardware counterparts, covering 4 decades of sound experiments, innovation, and heavy studio usage.

Adjustable Length & Decay

Fine-tune your spring reverb experience by adjusting the length and decay, taking you all the way from classic room reverberation to psychedelic space design.

Mono, Stereo, M2S Mode

We have implemented a versatile signal routing system that allows for mono and stereo processing as well as an M2S mode, which creates width from mono/stereo sources. In stereo mode, the left/right signal is sent to independent springs, whereas in M2S mode, the mono signal is sent to non-identical springs to create bespoke width.

Classic 3-Band Equalizer

In order to further tame the very specific spectral behavior of the spring, we have added a 3-band EQ to this plug-in. As springs tend to be naturally low-end heavy, with less mids or high-end, this can be equalized in the EQ section.

Adjustable Gain-Staging

The adjustable gain-staging gives you the ability to control the pre-processing input gain level, as well as the post-processing output gain level. Moreover, we have separated the stereo channels, to fine-tune the amplitude for the natural stereo image of multiple springs. These can vary based on the spring material and the signal’s frequency spectrum.

SSE2 optimized code

DSP operations are pipelined using the SSE2 instruction set. This ensures a high-performance operation despite our plug-ins’ very complex computations.

HighDPI/Retina Support

The user interfaces support high pixel density on both Windows and Mac OS systems, giving you the most enjoyable user experience on high DPI displays.

System Requirements

Minimum System Requirements (MAC)
  • SSE2 compatible processor (Intel Core CPU recommended)
  • 1GB of RAM
  • Mac OSX 10.9 or newer (Big Sur 11.x not yet supported)
  • VST, AU or AAX compatible host (64bit)
  • Display resolution of 1280x1024 pixels or higher
Minimum System Requirements (WINDOWS)
  • SSE2 compatible processor (Intel Core CPU recommended)
  • 1GB of RAM
  • Windows 7 or newer
  • VST or AAX compatible host
  • Display resolution of 1280x1024 pixels or higher

Extensive DAW Compatibility

Black Rooster Audio Plug-Ins (AAX/VST/AU) are compatible with all major digital audio workstations (DAW) and many more.

Avid ProTools ProTools
Presonus Studio One Studio One
Steinberg Cubase Cubase
Reaper Reaper
Bitwig Bitwig
Audition Audition
Live Live
Logic Logic
Digital Performer Digital Performer
FL Studio FL Studio

This character-filled vintage spring reverb allows you to own multiple units in one, with added features such as the 3-band EQ, spring length and mode controls and more! Not only does it capture the sound of multiple sought-after hardware classics, but it also allows you to create your own sound. From springy surf-style guitars, to psychedelic vocals - breathe new life to your digital recordings with all of the magic of analog processing, and none of the hassle of hardware gear.

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