Imagine a Great British Spring only well made and not in a drain pipe.
I used to dream of having one of these when I opened my studio in Luton in the 1970's, all I could afford at the time was a Grampian Spring which was mono and greatly inferior to the Master Room.
There were 3 versions of Mic Mix Master Room reverbs :
MR1 - 1 second decay
MR3 - 3 second decay
MR5 - 5 Second decay
Master Room spring reverb units provide natural reverb, i.e. Mono in Stereo out, just like the natural sound of a large hall or a church.
This one has a 3 second decay, there are no adjustments to the decay time however if the output is returned to the desk via the expander section of a dbx or bel noise reduction unit the decay time will be halved - if a longer decay is required the feed to the MR3 can be delayed using a DDL, this will not alter the decay time of course however it it will have a similar effect.
This one comes with a set of interface leads.