The Bubblesound SpringVerb is a hybrid Eurorack spring reverb module that combines an analog spring reverb driver with a state-variable filter to create a highly flexible and characterful spatial effects processor. It is designed for both traditional reverb applications and experimental sound design involving filtering, feedback, and self-oscillation.
The signal path begins with a SeM20-style state-variable filter, offering lowpass, bandpass, and highpass modes for pre-shaping or post-shaping the reverb input. At high resonance settings, the filter can self-oscillate and generate sine wave tones, allowing the module to function as a resonant feedback-based sound source even without an external input.
The integrated spring reverb section uses a medium-decay, three-spring tank and includes feedback control with CV input, enabling everything from subtle reverb shaping to dense, evolving feedback textures and droning resonances. A dry/wet mix control with CV input allows blending between reverb output and either the dry or filtered signal, selectable via an input routing switch.
In addition to the main mixed output, the SpringVerb provides separate filter and reverb outputs, allowing its components to be used independently in larger modular systems or complex signal chains. This makes it both a traditional reverb unit and a multi-functional sound design tool.
Features
• Analog spring reverb module with integrated state-variable filter
• SeM20-style filter with lowpass, bandpass, and highpass modes
• Filter can self-oscillate at high resonance settings
• Adjustable input level for controlled saturation and drive
• Feedback control with CV input for reverb regeneration and drones
• Dry/wet mix control with CV input and selectable signal routing (dry or filtered)
• Dedicated filter output and reverb-only output for modular routing flexibility
• Includes medium decay, 3-spring reverb tank
• Designed for both classic reverb and experimental feedback sound design
Specifications
• Product: Bubblesound SpringVerb
• Type: Analog spring reverb + state-variable filter
• Filter Modes: Lowpass / Bandpass / Highpass
• Reverb Tank: Medium decay, 3-spring tank (included)
• CV Inputs: Multiple (filter, feedback, mix) with attenuators
• Width: 10HP
• Depth: 45 mm
• Power Consumption: +43 mA / -30 mA
Included
• Bubblesound SpringVerb module
• Medium decay 3-spring reverb tank