Erica Synths Black Spring Reverb is a different take on spring reverberation units. Firstly, it has built in vactrol based audio compressor, secondly, it can operate an external tank and combination of both internal and external ones for effects unheard before, thirdly, in order to animate reverb effect, the module has built-in feedback effects - pitch shifters, delay, ring-modulator, etc; feedback amount and effect parameters can be controlled manually and via CV, making the module an experimental instrument on its own. Module comes with compact spring reverberation tank which can be easily installed in most eurorack cases.

Features
Compact spring reverberation tank to install in a skiff case
Manually and CV controlled feedback amount
Vactrol-based compressor
7 distinct feedback effects
Selection between internal, external reverberation tanks or combination of both
Feedback Send and Return jack sockets
The module is designed to be used with wide variety of spring tanks, but the best results will be using tanks with low input impendance - 8-200ohm

Technical specifications:
Audio input level -5V - +5V
CV level (full span) -5V - +5V
Power consumption 43mA, -71mA
Module width 12HP
Module depth 30mm
Internal reverb tank dimensions 190mmx67mmx24mm (30mm with spacers)