How do I obtain calibration? From a professional or a software tool? Would you advise.
Go the the calibration forum there is a thread that lists calibrators and where they are located if you want to go the diy route you will need a meter and software, lots of good info over there on that also. BTW used to own a GT25 it was a great set, if you PM me I might have some settings that can help you.
Time Warner Cable/Panasonic UB900/ Roku Premiere +/Sony S780 Soundbar/Harmony 650
Calman Enthusiast/Chromapure Standard with Auto Cal