This is from the Synergy Facebook page (9/11/2017):
"REVERSE COMPATIBILITY EXPLAINED.
One of the engineering feats that took so long in the development of Synergy was figuring out how to enhance the overall modular design, while still making it reverse compatible.
We felt it would be simply "wrong" to introduce the new Synergy system and tell everyone that once invested in modules and hardware (from Egnater and Randall) that their old gear is now obsolete. So we didn't do that and happy that we were able to pull it off (in style).
So here is how it works:
You can use old modules in the SYN1, SYN2, SYN30 and SYN-50 (basically all Synergy hardware).
You can use Synergy modules in old Randall gear but only one channel of the Synergy module will work (because Randall hardware was based on single channel modules). For those Synergy modules where channel 1 is different than channel 2, we provided a switch on the PCB allowing you to select which channel will engage when used in Randall gear.
You can use Synergy modules in old Egnater gear such as M4 and MOD50 and both channels will work.
Best performance of course will be Synergy modules with Synergy hardware. The new modules have the cathode biasing selection switch circuitry which is
not present on any previous hardware units.
We will not work on, service or warranty any old modules or hardware from Randall or Egnater."
"REVERSE COMPATIBILITY EXPLAINED.
One of the engineering feats that took so long in the development of Synergy was figuring out how to enhance the overall modular design, while still making it reverse compatible.
We felt it would be simply "wrong" to introduce the new Synergy system and tell everyone that once invested in modules and hardware (from Egnater and Randall) that their old gear is now obsolete. So we didn't do that and happy that we were able to pull it off (in style).
So here is how it works:
You can use old modules in the SYN1, SYN2, SYN30 and SYN-50 (basically all Synergy hardware).
You can use Synergy modules in old Randall gear but only one channel of the Synergy module will work (because Randall hardware was based on single channel modules). For those Synergy modules where channel 1 is different than channel 2, we provided a switch on the PCB allowing you to select which channel will engage when used in Randall gear.
You can use Synergy modules in old Egnater gear such as M4 and MOD50 and both channels will work.
Best performance of course will be Synergy modules with Synergy hardware. The new modules have the cathode biasing selection switch circuitry which is
not present on any previous hardware units.
We will not work on, service or warranty any old modules or hardware from Randall or Egnater."