Small rooms can sound superb

A spare bedroom, a back lounge, a corner of an open-plan flat — none of these rules out convincing surround sound. In many ways a smaller room helps. You sit closer to the speakers, so you need far less power to reach cinema-like levels, and the room itself reinforces deep bass, flattering even a modest subwoofer. The catch is that small rooms are much less forgiving of careless setup. Reflections arrive sooner, bass standing waves bunch together, and a speaker shoved into a corner will boom. Get the fundamentals right and a compact 5.1 system can comfortably outclass a far pricier one that has simply been plonked down at random.

Placing the front three

Start with the left and right speakers. Sit in your main listening position and picture a line running between your ears. The front pair should sit roughly 22 to 30 degrees either side of straight ahead — for most small rooms that means a spacing of about 1.5 to 2 metres, with you sitting the same distance back. An equilateral triangle is the classic starting point, and it is rarely far off.

Angle each speaker inwards slightly so it aims just past your head rather than straight down the room. This sharpens the stereo image without making everything feel narrow. Keep the tweeters at roughly ear height when seated, and pull the speakers forward of any alcove or cabinet so they are not firing out of a tunnel of hard surfaces.

The centre channel does most of the work in films, so it deserves the best position you can give it. Put it directly above or below the television, as close to the screen as practical, and keep its front face flush with — or slightly proud of — the cabinet edge. If it sits recessed inside a shelf, dialogue will sound boxy and muffled. Where possible, match its tweeter height to the front left and right so voices do not jump vertically as characters move across the screen.

Surrounds and the seating position

Surround speakers are there to envelop you, not to shout at you. Place them to the sides of the listening position, or just behind it, at around 100 to 120 degrees from straight ahead. In a small room this often means wall-mounting slightly above ear height and angling them down towards the sofa.

A few practical points worth knowing:

• Keep the surrounds roughly level with, or a little higher and further back than, the front pair so effects move smoothly around you.
• Try not to sit with your head against the rear wall — it exaggerates bass and makes the surrounds feel like they are behind your ears rather than around you.
• If your sofa is against the back wall, pull it forward 30 to 50 cm if you possibly can. It is one of the cheapest upgrades in home audio.
• Avoid pointing surrounds directly at your head from very close range. A little toe-in or a slightly higher mounting smooths them out considerably.

A modest subwoofer, properly integrated

A subwoofer does not have to be large to transform a film soundtrack. In a small room, room gain works in your favour, so an 8-inch or 10-inch sealed or compact ported model is usually plenty. What matters far more is where it sits and how it is set up.

Corners give the most output but also the most uneven, one-note bass. Start with the sub a third of the way along the front wall, a little out from the corner, then experiment. A useful trick is the crawl test: place the sub in your seat, play something bass-heavy, and crawl around the floor at subwoofer height. The spot where the bass sounds tightest and most even is where the sub should live.

Set the crossover in your receiver to around 80 Hz as a default. Small satellite speakers with 3- or 4-inch drivers often prefer 100 to 120 Hz, which takes the strain off them and cleans up the midrange. Set the subwoofer's own crossover to maximum, or bypass it entirely, and let the receiver handle bass management.

Finally, decouple it. A paving slab, a thick isolation pad, or a dense rubber mat under the sub stops energy travelling into wooden floors and into the room below. It costs very little and it is the single best thing you can do for neighbourly relations.

Distances, levels and the numbers that matter

Channel levels and distances matter more than amplifier wattage. A well-levelled 50-watt system will sound far more coherent than a badly set-up 150-watt one.

• Measure the distance from each speaker to your head with a tape measure and enter those figures into the receiver. This sets the delays so effects arrive together rather than smearing across the room.
• Use the receiver's built-in test tones and a sound level meter or a phone app to set every channel to the same level, typically 75 dB, at your seated position.
• Set the subwoofer 4 to 6 dB hotter than the other channels if you like cinematic impact. That is a preference, not a rule — trust your ears.
• Re-check levels after moving any furniture. A new rug or a sofa in a different spot changes everything.

Everyday compromises and late-night listening

Most UK listeners are balancing good sound against thin walls, wooden floors and shared buildings. The good news is that much of what sounds impressive at low volume is midrange clarity and well-timed surround effects, not raw bass. Use your receiver's night mode or dynamic range compression when the neighbours are in, and accept that you may need to trim the sub a few decibels after 10pm.

Soft furnishings help too. A rug between you and the speakers, a lined curtain across a bay window, and a bookshelf behind the seating position all tame the bright reflections that make small rooms sound harsh. Aim the front speakers so they cross just behind your head rather than in front of it, and take ten minutes to re-run the level calibration whenever you change something significant. Small rooms reward patience far more than they punish ambition.