Hi Folks!\n\nI'm new to this forum! I had several questions about HT setup for a dedicated media room.\n\nFirst off, what my room is like - it is a dedicated media room with no ambient sound or light, with insulated walls. The dimensions are 9' height x 13.5' wide x 17.5' deep. I plan on projecting onto a 120'' screen on a 9'x13.5' wall. The projector will be placed 13.5' from the screen (4 feet between the projector and the back wall).\n\nFirst off - I'm fixed on the speakers that I'll be using - B&W 702 S2 and HTM71 for my LCR, CWM7.4 for surrounds, and CCM664 for atmos (if atmos makes sense...).\n\nNow, the issue. In my excitement and hubris, I really wanted to take advantage of the pre-wiring in my room, and establish a full 7.2.4 system.\n\nTo power the system, I opted for the Arcam AVR 550, and the upcoming PA410 Arcam 4-channel power amp. This way, I've got all 11 speakers powered up and Dirac-able.\n\nFew things have come to my attention that are giving me second thoughts:\n1. The Arcam PA410 will only be available in April!! That's a loooong time to wait to set this media room up.\n2. Is it wise or foolish to consider a 7.2.4 setup? Would a 5.2.2 or a 7.2.2 suffice for my room size? What is the potential value add of a 7.2.4 vs 5.2.2?\n3. I've recently been made aware of bi-amping. The 702 can be bi-amped. If I were to do this, I'd dedicate two channels of the same receiver\/power-amp to each 702. I believe this is called "vertical passive bi-amping" (correct me if I'm wrong). Is there significant value add in doing this? I intend to use the HT for 80% movies and games, 20% music.\n4. How many rows of seating can I potentially have in this room? This will affect the number of surrounds and atmos speakers I install.\n5. If I value a 7.2.4 setup and bi-amping, should I be looking at the Denon x8500h instead? What would the sound quality be by comparison?\n\nI have attached pictures here. Please let me know your thoughts. Thank you so much!