Smacks of a "consultant" who has never experienced 5.1 audio.
It looks like the rest of the HT experience will suffer for the sake of a 120" screen.
Does your son in law really need a 5' x 9' screen in what is a medium sized room at best?
And ghdprentice is correct that having a centre channel speaker is essential and the quality and placement will determine whether the experience is believable.
Finally, how does one build a home theatre room where the two primary seats are off axis?
Thanks for the input. I have put together a few high end 4.1 systems together with a phantom center but have always had a spot in the sweet spot. I have Persona 5 F’s now and people come over they look for a center speaker. Anchored dialog and seamless so please don’t diss phantom centers, you guys do make a great point about the seating so a center may be needed
we are going to look at the Paradigm Founder series over the weekend I think it may have the right amount of grunt and glamour for them
His 120 screen is awesome from 9 ft He has YouTube Tv so you can watch 4 games at once . Pretty sweet
Like @ghdprentice strongly implies, this doesn't sound like a formula for success. I'll add that wall mounted speakers are quite the compromise for HT. I have 3 large pairs of floorstanders in my HT room for front, mids, and rears.
Paradigm makes very good center speakers, which is key and not true of many other makes where it seems more like a design afterthought. I used to use a phantom center too and worked great near the sweet spot, but once you got more than a couple feet outside of it things went south fast hence the recommendation for a center in your use case. I’m sure the Paradigms will sound great.