I'm an 840C owner. I'm not using it now because I have an Oppo 105. I can say that I never found the 840C to have glare though. I use a McIntosh integrated with Shunyata power filtration and Martin Logan speakers. Both players work very nicely in my system but the 105 is the best and it also does an excellent job of video as well.
I auditioned some Nordost Blue Heaven speaker cables a week or two ago and found them to be bright/brittle and to have a sound that lacked cohesion (like my audiophile terms!) This could be part of your problem, I don't know. But I have had an experience kind of like one of the posters above. Again, I never found the 840C to have glare. I always wished it could provide a bit more air at the top though. The Oppo does that for me.
I auditioned some Nordost Blue Heaven speaker cables a week or two ago and found them to be bright/brittle and to have a sound that lacked cohesion (like my audiophile terms!) This could be part of your problem, I don't know. But I have had an experience kind of like one of the posters above. Again, I never found the 840C to have glare. I always wished it could provide a bit more air at the top though. The Oppo does that for me.