Can speakers be hidden completely under plaster?
They can: there are invisible speakers that mount in a wall or ceiling and are skimmed over, leaving a smooth surface. But in sound quality they fall below an ordinary ceiling speaker: the emitter works through the layer of filler, highs are dulled and power is limited.
So they are used where the design will not allow a visible grille and sound is wanted as background: in a living room with a marble wall, in the bedroom, in the bathroom. For the main listening area an ordinary speaker with a thin frame, or none, painted to match the ceiling is better. The decision is made when designing ceiling and lighting: a speaker needs an exact-size opening and a box behind it.
What to choose: ceiling, wall or invisible speakers?
For background sound around the home, 16 to 20 cm ceiling speakers suit, one pair per room. For music and film, wall or floor-standing speakers are chosen and ceiling ones added as effects. Invisible models are kept for places where an ordinary speaker cannot go.
Ceiling speakers are placed as a symmetrical pair 1 to 1.5 m from walls and at a spacing suited to the room, without chasing a stereo sweet spot. They need 10 to 12 cm of depth in the ceiling, so they are coordinated with air-conditioning and ventilation routes. In 3.2 to 3.5 m ceilings, ceiling sound performs less well than at 2.6 m, and speaker power is chosen with margin.
For a room where music is listened to seriously, a separate acoustic design is done, not a scatter of ceiling points.
Where do the amplifiers and rack go?
Amplifiers, network gear and the sound source are gathered in one place: a technical cupboard, a hall niche or a cupboard in the utility room. The rack needs ventilation so equipment does not overheat, power, sockets and room to grow.
An ordinary multi-zone amplifier gives 50 to 100 W per channel and sheds heat, so it is not shut in a blind cupboard. With a ventilated niche and forced extraction, the unit lasts longer. Beside the rack, space is planned for the smart-home panel, router and Wi-Fi: all go in one technical node so cables converge at one point.
A compact option is streaming amplifiers in each zone, connected over the network and dispensing with a common rack, but they must be hidden near the speakers.
Which cables should be laid in advance?
Before the walls close, lay speaker cable of 2 x 1.5 mm2 to each speaker for runs up to 15 m and 2 x 2.5 mm2 for longer, Cat6 network cable to each zone and TV point, and empty conduits for future tasks. Oxygen-free speaker cable is preferable and cross-section should not be skimped.
Each ceiling speaker gets its own line from the rack, not parallel branches: that makes zone volume easier to control. If cinema surround speakers are planned, their cables are laid from the start. Cables are labelled at both ends and entered in the diagram: in a few years the label finds the right cable in a minute.
If you are choosing a control system, check beforehand which protocols the rack supports: it must work with your platform. We cover it in the article on home automation and laying cables before the walls close.
Will the neighbours hear it?
A ceiling speaker radiates sound not only down but also up, into the ceiling cavity, and a plasterboard ceiling on light joists passes it to the neighbour above. So speakers are taken in sealed boxes and the cavity is filled with mineral wool.
A ceiling on resilient hangers helps cut transmission: the same measure that protects you from footsteps above attenuates your speakers' sound in the other direction. Airborne noise requirements between dwellings in new buildings are at least 50 dBA, but old buildings lack that insulation and a loud home cinema is heard by neighbours on both sides. More on sound protection in a flat is in our article on soundproofing.
A practical approach: for a cinema room choose a room away from shared walls and in other zones limit the maximum volume in the programming.
How do you combine sound with control and multiroom?
Multiroom is built on streaming amplifiers or a multi-zone amplifier controlled through an app or the home-automation system. Each room can then play its own music, or one source can play through the whole home, and the evening scene starts the right zones with one button.
Compatibility is checked before buying: the amplifier must be able to work with your control platform over IP or analogue inputs. If the home is based on KNX or another backbone, sound connects as a separate subsystem through a gateway. For an owner living in another country it matters that settings are stored in the rack itself, not only in the manufacturer's cloud.
The app is convenient, but ordinary buttons remain by the entrance and the bed: a guest does not need a phone to stop the music.
How can BCN YARD help with built-in sound?
We plan cables, niches and the rack together with the electrics and ceilings so sound does not have to be fitted after the fact. A specialist handles the acoustics and set-up: one you choose or one of our trusted subcontractors. We visit the site, agree the zones with you, one person is responsible for the site, and we speak Russian and Spanish. The estimate is prepared after the visit and measurements.
Frequently asked questions
Can speakers be hidden completely under plaster?
Yes: invisible speakers mount in a wall or ceiling and are skimmed over. They sound weaker than an ordinary ceiling speaker, because the emitter works through the filler layer and highs are dulled. They are used for background sound in a living room or bedroom, and the main listening zone uses ordinary speakers.
Where do multiroom amplifiers go?
In a technical cupboard, a hall niche or a utility-room cupboard with ventilation and a network cable. A multi-zone amplifier gives 50 to 100 W per channel and warms up, so it is not shut in a blind cupboard. Beside it you plan the smart-home panel, router and room to grow.
Will neighbours hear ceiling speakers?
Yes, unless measures are taken: the speaker radiates upwards into the ceiling cavity and sound reaches the neighbour above. Speakers in sealed boxes, mineral wool in the cavity and a ceiling on resilient hangers help. Old buildings have little insulation between flats and a loud cinema is heard on both sides.
Which cables should be laid in advance for built-in audio?
Speaker cable of 2 x 1.5 mm2 to each speaker for runs up to 15 m and 2 x 2.5 mm2 for longer, Cat6 to each zone and empty conduits for the future. The line to each speaker runs separately from the rack and is labelled at both ends. All of it is laid before walls and ceilings close.