Just thought it would be worth adding mine:

FL DSP3200 2.6m +ve -6.0db
C DSP3100HC 2.4m -ve 0.0db (+3db more in center level DSP presets)
FR DSP3200 2.6m +ve -6.0db
Sub +ve 0.0db

I've triple checked and the center definitely requires -ve to be in phase with the 3200s.

Chris
Srces: Wiim Pro | OSMC Vero 4K+
Procs: HD621 > G61R > Minidsp DDRC-88D
Spkrs: 7200.2 + 5KC + 5Ks | iNuke6K > USC15 | iNuke3K > 2 x Crowson T108SS
Video: JVC HD950 & 1.9m React3 2.4:1 screen
Room: 5.8x2.8m | Various GIK Panels