Home theater setup: the complete guide

A dedicated room (often a basement) lets you control light completely, run wires in the walls, add rows and a riser, and use a projector. A living room has to share space, light and noise, which is why the plan above picks a brighter screen when you say the room has daylight, and why speaker placement matters more than speaker count there. Both use the same nine steps. See basement theaters, small rooms and open-plan rooms.

Up to about 100 inches a TV is simpler and brighter, and needs no screen. Past that, a projector is usually the only way to go bigger: our dark-room pick with a 120-inch screen was $2,229 on Oct 6, 2026, and our ultra-short-throw pick with its 110-inch light-rejecting screen $4,000. In a room with daylight, a projector needs that ultra-short-throw-and-ALR pairing; a standard white screen wants a dark room. Full comparison: projector vs TV and a projector in the living room.

Throw distance is the throw ratio times the picture’s width: a 120-inch 16:9 picture is 104.6 inches wide, so a 1.00–1.30 lens sits about 8 ft 9 in to 11 ft 4 in from the screen (BenQ, Epson’s distance tables). Check the exact model’s calculator before you drill. Use lens shift, not keystone: keystone correction reshapes the picture digitally and throws away resolution; lens shift moves it optically. Screen height: keep the bottom edge at about 28 inches or more so a center speaker fits under it and a second row can see over the first; the picture’s center then sits a few degrees above your eyes. Screens: gain brightens the center of the picture at the cost of the viewing cone (Stewart’s half-gain angle), and an ultra-short-throw projector needs a light-rejecting screen made for its steep angle (Screen Innovations). Mounting: into a ceiling joist or onto a solid shelf, with power brought there by an electrician (not an extension cord through the ceiling) and HDMI run before the ceiling is closed. Listen for the fan from the seats; a projector right above your head is the loudest place for it.

The VESA pattern (say 400 × 300 mm) is only the spacing of the holes on the back of the TV: it says nothing about the wall. What holds the TV is the wall’s structure and the fasteners the mount’s manual specifies for it.

Keep three numbers apart. The rated load is the most the mount takes, accessories included: never exceed it. A UL-listed mount is tested to a multiple of it (Peerless quotes four times): that is a safety margin, not extra capacity. And the wall must carry several times the TV and mount (four to five times in the manuals we read). The safety standard for wall mounts is UL 2442. A TV on furniture needs anchoring too, for both the TV and the furniture (CPSC); the STURDY rule covers dressers, not TV consoles. Locate pipes and wires before drilling, and if the wall is uncertain, use the mount maker’s support or an installer. More: how high to mount a TV, Will it fit?

Comfort is part of the design: a seat you want to sit in for three hours, a room that doesn’t hum, and light you can control. Recliners lower your eyes by about 2–6 inches as they recline (UNIC), which lowers the ideal screen height a little. Keep a walkway clear of the seats and of the projector’s beam, and put the equipment’s fans and the HVAC return away from the main seat. See riser height and how far the couch should be.

Overhead speakers in the ceiling go at about 45° in front of and behind the seat (Dolby allows 30–55°), lined up with the front left and right; a single pair (x.x.2) goes nearly overhead at about 80°. Up-firing “Atmos enabled” modules bounce sound off the ceiling instead, which Dolby says needs a flat, hard, reflective ceiling between 7½ and 14 feet high (ideally 7½–12 ft). Dolby also places the modules at or a little above seated ear height, no higher than half the wall’s height, and at least 3 ft from anyone listening (ideally 5 ft or more). A soundbar’s up-firing drivers need the same clear bounce path; some bars only simulate height. Full layouts: 5.1, 7.1, Dolby Atmos, the center speaker and soundbars.

The wall behind the speaker. Sound from the back of the cabinet reflects off the wall and cancels the direct sound where it arrives half a wavelength late: the first dip falls at about the speed of sound ÷ (4 × the distance from the wall to the woofer). Genelec’s example: 86 cm from the wall, a dip near 100 Hz.

EQ can’t fill it, because it changes the direct and reflected sound together. Genelec’s remedies are placement: flush in the wall, or very close to it, which pushes the dip up where it does less harm. For a speaker crossed over at 80 Hz, close means the woofer within about a foot of the wall (the dip lands near 280 Hz and up); 1½–3 ft is the worst spot, putting it at about 95–190 Hz, right where the speaker takes over from the sub (Genelec’s under-2-ft figure is for its own monitors). Moving far out and treating the wall behind are its other options, best checked by measuring. Close up, tame the extra bass with the speaker’s wall setting or room correction. Keep left and right at matching distances.

• Toe-in. Aim at the main seat to start, then adjust by ear. KEF starts its coaxial speakers at 0° and adjusts in steps of about 2°; unequal side walls can justify unequal angles.
• Stands or wall mounts sound the same if they put the speaker in the same place: choose the one that gets the tweeter to ear height.
• Power: read sensitivity’s basis (KEF’s R11 Meta: 90 dB at 2.83 V and 1 m, which at its 4 Ω nominal impedance is about 2 W) and the minimum impedance (3.2 Ω), and check the receiver is rated for that load. Watts alone don’t predict how loud a system plays at your seat.

The order depends on the receiver. On the nine-channel receiver, run Audyssey first with both subs connected, tune by hand, and don’t re-run it afterwards: it resets the distances you set. On the seven-channel receiver, set the subs’ own knobs first (items 1 and 3 below), then run Audyssey last. Its setup asks for the sub volume at about 10 o’clock: set the louder sub there, turn the other down until the measurement shows the same gap again, and leave both phase knobs as you set them.

1. With the measurement mic and the free REW software, measure each sub on its own at the main seat and at two to five seats around it, 20–200 Hz.
2. Nine-channel: set both subs’ distances equal, then delay one by lengthening the other’s distance (about 1.1 ft per millisecond) in 1–2 ms steps up to about 15 ms, also trying its level 3 dB up or 3–6 dB down and its polarity. Keep the setting where the seats’ curves look most alike; the free Multi-Sub Optimizer (MSO) can search this for you.
3. Seven-channel: turn one sub’s phase knob in steps of about 30° (the 10E’s runs from 0 to 180°), then try Sub 2’s volume 3 to 6 dB down, measuring every seat each time. If you won’t measure, set both knobs alike (phase 0, the same volume) and let Audyssey set the pair: you keep the extra output and give up some of the evenness.
4. Check the handover last: at the main seat, measure the speakers and subs together and look for a dip around 80 Hz; nudge the sub distance or flip its phase if there is one.
5. On the nine-channel receiver, re-measure in REW after any change rather than re-running the calibration; on the seven-channel one, re-run Audyssey after changing a knob. Dirac’s Bass Control, in the bigger plans, does this search for you.

Set the speakers to an 80 Hz crossover (the THX starting point), leave the LFE low-pass at its default (often 120 Hz), and let room correction set the sub’s distance and level (a distance longer than your tape measure is the sub’s processing delay, not an error). In an apartment, keep the sub off shared walls and floors and close to the seat. Size by measured output, not driver size: a large or open-plan room needs several decibels more clean output at 20–31.5 Hz (the CEA-2010 figures in our picks), or a second sub; the phase check is under step 8. Try spots in your own room with the subwoofer simulator; the full method is in subwoofer placement.

Order matters: furnish, then a rug, curtains, the first-reflection panels, then the wall behind the seats if it is close and hard, then bass traps. With in-ceiling heights, the ceiling between you and the speakers can take a pair too (the top plans buy one); with up-firing heights, leave that ceiling bare, since they bounce off it. Where a sub stands in a corner, hang that corner’s trap above it. Measure or listen between steps; most living rooms are done after the first three. Details: where to put panels, how many, rugs and curtains, bass traps, and the panel finder.

Acoustic panels don’t stop sound leaving the room. Keeping it in takes construction: mass, airtight seams and decoupled walls, and bass is the hardest part (single-number ratings like STC barely describe it; ASTM E413). Without building work, the steps that help most: seal the door with gaskets and a door bottom, keep the subwoofer away from shared walls and corners (KEF; isolation feet change transmission by about a decibel or less), sit closer to the sub so it needs less output, and use night mode or dynamic volume for late films. Bass carries furthest, so turning the sub down a few decibels late at night does more than anything you hang on the walls.

For 4K120 and other HDMI 2.1 signals, buy a certified Ultra High Speed HDMI cable (it carries a scannable label); certification is per model and length, and “8K” on a marketplace listing is not certification. HDMI control (CEC) turns devices on together and passes volume, but brands implement it differently: if devices fight over inputs, connect them one at a time and turn off only the control functions you don’t want. Sony’s eARC checklist is a good general one: HDMI control on, ARC/eARC set to Auto, the labeled port, then add other devices back.

Ceiling speakers. Find the joists first (a stud finder, then a small test hole) and mark the cutout with the template that comes with your speaker: sizes differ by model. Cut with a drywall saw, clear of lights, pipes, ducts and wiring; pull the wire through, then tighten the speaker’s swing-out clamps until it is snug against the drywall, not crushed (Totem). Some ceilings, such as fire-rated assemblies between apartments, need a listed back box: check the speaker’s listing and local code before you close up.

Fishing wire. Use in-wall-rated speaker cable (CL2 or CL3). Work from the attic or basement where you can; across a ceiling, run parallel to the joists, and where you must cross a solid joist, drill through its middle, at least 2 inches from its edges (Totem). Never drill a truss or an I-joist’s top or bottom flange; an I-joist’s web only where its maker’s hole chart allows. Seal any fireblock or top plate you pierce with fire-rated sealant. In walls, keep holes under 40% of the stud’s width and add a nail plate wherever the cable passes within 1¼ inches of the face (Crutchfield). Push fish tape or fiberglass rods through the cavity, tape the cable on and pull it back, going around insulation rather than through it; low-voltage brackets finish the openings.

Speaker wire: red (+) to red, black (−) to black at both ends; one reversed speaker sounds thin and vague. Banana plugs make the connections tidy and repeatable. Subwoofer: one cable from the receiver’s Sub/LFE output to each sub’s LFE input. Set each sub’s own crossover knob to maximum or LFE/bypass, so the receiver does the bass management (SVS). Channels: tell the receiver what is connected in its speaker setup. A seven-channel receiver runs 5.1.2 by using its surround-back amplifiers for the two height speakers; a nine-channel one needs a stereo power amplifier on its pre-outs for 7.1.4 (the manual’s amp-assign page shows which). Phase, then calibrate: with one sub, set its phase to 0, then play an 80 Hz test tone through the front left and the sub together, try the sub’s phase at 0° and 180°, keep whichever is louder at your seat, and calibrate (step 9); if you change it later, rerun the correction. With two subs, set them as the table at the top of step 6 says instead: its tuning steps replace this check.

A 4K Blu-ray carries several times the data of a 4K stream. These are measured examples, not averages for every title: the disc figures are three recent releases, the streams older published samples.

More data doesn’t always mean you’ll see or hear a difference: a good stream on a good connection looks excellent, and we found no controlled test showing every listener hears lossless Atmos. But discs don’t buffer, don’t leave the catalog, and carry the lossless track, so for the films you care most about a 4K Blu-ray player is the upgrade. Plain ARC can’t carry that lossless track; eARC can.

Picture: Filmmaker Mode gets you most of the way. To check black and white levels, use genuine test patterns (a calibration disc, or the patterns in a calibration app) rather than another owner’s numbers: settings don’t transfer between panels, even of the same model. For games, use the console’s HDR calibration with the TV’s game mode; whether the TV should also tone-map (or use a mode such as HGiG) depends on the model, so follow its maker’s advice and don’t stack two tone mappings. A professional calibrator earns their fee for projectors, where the screen and room change everything, and for premium TVs in dedicated rooms. Sound: room correction works from its own microphone. To see what placement and correction actually did, a calibrated USB mic and the free Room EQ Wizard measure the bass at your seat: measure, move one thing, measure again, and look at 20–200 Hz, where rooms do the most damage. Our measurement pick is $79.