D20E dual dimmer modules have heavier copper chokes giving it a higher rise time for smoother and quieter dimming compared to standard D20 modules. 

Modules haven’t been used. Been sitting in their boxes on the shelf for about 5 years. New modules list for $830 each. 

Compatible with:

- All SR racks (CEM, CEM+, CEM3)

- All Drd racks (Paradigm, Echo)

- All Legacy Unison Dr racks (CMEd) 

NOTE: will make deals on full boxes of 6.