Spring Reverberation


Spring Reverberation Tile

Width: 12 HP / 2 Tile Units
Depth: 24mm (0.95″)
Power cable: Tile Tail (3-pin)
Power +12V: 30mA
Power -12V: 30mA


Accutronics 2BF2 Mini Reverb Tank

1U Tile Specs



The Spring Reverberation tile allows you to add the unique sound of a real spring reverb into a compact 1U space.  The tile has controls for drive, feedback and mix and has jacks for a mixed output, direct tank and external feedback.

The “DRIVE” control determines how hard the tank is excited by the signal patched to the “IN” jack.  The “FEEDBACK” control provides a normalized internal loop with soft clipping that is active only when nothing is patched into the external feedback jack “EXT FB”.  When a cable is patched into the “EXT FB” jack, the internal feedback is broken and the “FEEDBACK” control becomes a secondary drive into the tank.  The “TANK” output jack provides access to the full wet signal from the tank for processing feedback loops or external mixing.  The “OUTPUT MIX”  sets the wet/dry mix on the “OUT” jack.

The  Spring Reverberation tile is designed to work with tanks with an input impedance of 150 to 200 ohms and output impedance’s of 1500 to 2600 ohms.  Send and return headers are used for connecting to the Accutronics “Blue Reverb” mini reverb tanks (2BF2 & 2BF3).  An adapter cable is available for using the Spring Reverberation tile with tanks using traditional RCA jack inputs.  When experimenting with alternative tanks it is important that only tanks with floating input coils are used (insulated input).  The Amplified Parts webpage has some useful information about reverb tanks here.

Spring reverberation tanks are very susceptible to picking up electromagnetic noise and don’t work well with some Eurorack modules. If you are planning a system that includes digital modules with microcontrollers and multiplexed LEDs or displays it might be best to not include a spring reverb tank in the case.

There are some things to try when troubleshooting reverb tank noise issues. First determine if the interference is originating from inside the case (module, power supply, power cable) or from another source in the area (external power adapter, lighting, AC power cables). Try moving your case to a different location in the room and see if that has a effect on the sound coming from the reverb tank. A small change in position or orientation can sometimes make a large difference in the interference. If this doesn’t have any effect on the sound then most likely the source of interference is a module in the case. Determining which module is emitting the electromagnetic noise. One method that sometimes works is to play around with the user interface on the suspected module while listening to the tank noise and try to detect changes in the sound. A better way to determine the source of the noise is to disconnect the power cable from each module one at a time and see how the noise changes. When you find the noisy module relocate it in the case as far as possible from the return side of the reverb tank. In the LBZ54-S case it would be best to locate noisy modules on the left side of the case.

Reverb Tank Sold Separately:

Accutronics 2BF2 Mini Reverb Tank