I have gotten some good ideas and have come to realize that placing speakers on either side of the entertainment center is the best choice for sound, but I believe I need to find the second best place.
I have come up with a new option. Placing speakers above the entertainment center and angling them down toward the couch. Is this a better option versus placing the speakers on either side of the television only 46" apart?
I can place the speakers 8' apart if I place them on the wall above the entertainment center.
Thanks!
Do I understand correctly that placing speakers on either side of the entertainment center is
simply not an option, even bookshelf speakers on stands? If so, I think you're going to have to do some experimentation in order to determine which of the acceptable locations (above the entertainment centre or beside the TV) has the least detrimental impact on sound quality. I would also suggest that the centre speaker be placed in the same plane as the left and right mains if possible, i.e. if you put the mains above the entertainment centre, place the centre speaker there as well. Then angle them all towards the listening position. At least try it.
I took another look at your posted photo. There appears to be a crown molding around the top of the entertainment centre. That raises a question regarding placement of speakers on top. Is the top of the molding flush with the top of the entertainment centre? If not, you should place some sort of platform under each speaker, so that the bottom of the speaker is at least at the same height as the top of the molding. I hope you can picture what I'm trying to say here.
The potential issue is that if the molding is partially obscuring the drivers in your speakers, it will deflect sound upwards, rather than towards the listening area - especially if the speakers are angled downwards.
Personally, I would find perching my front speakers on top of the centre less visually appealing than placing them on stands on either side of the centre. I understand that arrangement of a HT involves compromises. And you, have a significant compromise facing you, whichever placement you opt for (above the entertainment centre or beside the TV). I once again, urge you to reconsider those options. If sound quality is important to you and your wife, then bookshelf speakers on stands are your best option.
Good luck!