Home cinema: plan the sound before you choose the equipment

I recommend starting with the room, not the equipment list. Choosing a receiver, projector and speakers first and then trying to make them fit the room leads to compromises. Before I think about brands or channel counts, I want to understand the room itself: its shape, what it's built from, where the seating realistically has to go, and how the household actually wants to use it — films most nights, the odd sports evening, music, or all three.

The reason I insist on this order is simple. A room's proportions, its openings, and what's behind the walls affect what any sound system can do in it far more than the badge on the speaker. If I choose the layout and intent first, the equipment list writes itself. If I choose the equipment first, I spend the rest of the project trying to force a room to behave like a showroom it was never built to be.

I treat this as a sequence, not a shopping list. Skipping a step usually shows up later as a compromise nobody chose on purpose.

Rather than inventing speaker positions from habit, I work from the manufacturer guidance for whatever surround format the household wants to use. Dolby publishes a clear step-by-step guide to planning a home theatre room and a set of speaker placement guides for the common Atmos-enabled layouts, and I use these as my starting reference point for every project, then adapt them to the real room ^{[1] [2]}.

I say 'starting reference' deliberately. A published layout assumes an ideal, empty box. Real rooms have a sofa against one wall, a door where a surround speaker would ideally sit, or a ceiling that can't easily take an overhead speaker. My job is to apply the logic behind the official guidance — seating position first, a clear path between listener and speaker, symmetry where it's achievable — and adapt it honestly where the room won't allow the textbook answer.

Once the seating and speaker layout are settled, the screen position usually becomes obvious: it sits at the focal point the speaker layout was already built around. I check throw distance and lens options against the specific projector being considered, rather than assuming one model's numbers apply to another — projector optics vary enough between models that this has to be checked against that unit's own documentation.

Ambient light matters as much as throw distance. A room with any daylight or spill from an adjoining space needs either reliable blackout or a screen and projector combination suited to some ambient light. I'd rather raise this early, while shading or a different room is still an option, than after the screen is mounted.

Everything above is design and layout work. The actual electrical supply for a projector, powered subwoofer, or in-wall speaker wiring must be installed by a qualified, licensed electrician, to the applicable local regulations and to the manufacturer's installation requirements for that specific product. I plan containment, power requirements and device locations. Electrical installation must be carried out by suitably qualified trades; I coordinate the design requirements. Always confirm final requirements against the manufacturer's own installation manual before anything is fixed in place — ratings, clearances and mounting methods do change between models and revisions.

If you take one thing from this article, let it be the ordering: room and seating first, layout second, equipment third. Everything downstream — acoustics, calibration, day-to-day enjoyment — gets easier when the sequence is right from the start.