Building a media wall: heat, cables and the things nobody plans
A media wall is the one built-in with live electronics inside it, and that changes what the cabinetry has to do. Equipment gets warm, cables have to travel from a socket to a screen without appearing, and every box in there will be replaced before the furniture is. None of that is hard, and all of it is nearly free while the design is still a drawing.
Give the electronics air and a path for it, which usually means an open back rather than a fan. Plan the cable route from the socket to the screen as part of the design rather than as a problem for the fitter. Size the depth from the deepest box plus its plug, not from the television. And build for access, because you will change equipment several times and you should not have to unscrew furniture to do it.
Heat is the thing that kills the equipment
A shelf in a bookcase does not care what sits on it. A closed compartment with an amplifier, a games console or a set-top box inside is a different object: those things convert electricity into heat, and in a sealed box the heat has nowhere to go except into the equipment that made it.
The fix is unglamorous and structural. Air has to be able to enter low and leave high, which in a cabinet means the back is open, or has openings, rather than being a sealed sheet. Fans exist and they are a patch: they add noise to the one room where you are listening to things, and they fail silently.
What each manufacturer needs is in their manual, and it varies enough that a general number would be wrong. The design principle is what generalises: leave a gap and give the air somewhere to go.
The back panel is the answer to both problems
Cables and ventilation are usually treated as two problems, and one decision solves both. The back of a cabinet is a real choice, and ours offers five: a full structural panel, a thin sheet in a groove, a thin sheet applied to the rear edges, rear braces, or nothing at all.
For a media cabinet, the braced back is the one. It means no sheet, and instead a board across the top of the opening and another across the bottom, each fixed into both sides. Those two boards do the job the sheet was doing, which is stopping the box folding sideways, and the space between them is open: cables pass anywhere along it, air moves through, and nothing has to be cut or drilled on site.
Two rules come with it, and they are not arbitrary:
At least two boards. One band lets the box twist around it, so a single rail across the top is not a braced back, it is a hanging rail.
Keep the gap between them under about 1200 mm. Past that, the free length of the cabinet side has room to bow out of plane, and no amount of extra board width at the ends fixes it. On a tall media unit, that means another board rather than a wider one.
The back panel guide covers the full set, including why a thin back is fine everywhere else and why it must never be what carries a wall-hung cabinet.
Cables, planned as geometry
Every cable in a media wall goes from something to something else, and the useful exercise is to draw those lines before the cabinet exists. Power from the socket to each box. Signal from each box to the screen. Speaker cable outwards. Aerial or fibre inwards.
Then design for them:
A notch in the back of a shelf lets a cable drop from one level to the next without being pinched at the rear edge. Cheap to machine, impossible to add neatly later.
A grommet in a top or a shelf where a cable has to surface rather than travel behind.
Keep power and signal apart where you can. Running them in the same tight bundle for a long stretch is the usual cause of interference people blame on equipment.
Leave slack. A cable cut to exactly the right length means the box cannot be pulled forward to reach its own sockets.
If the television is wall mounted, decide early whether the cables run inside the wall or behind the cabinetry. Inside the wall is tidier and is building work; behind the cabinetry is furniture work and reversible. Both are fine, and choosing after the plaster is done is not.
Depth, and the recess trap
Depth is set by the equipment plus its plug, exactly as it is for a freestanding console, and the guide to sizing a TV stand covers how to measure it. In a built-in there is one extra decision that catches people out.
A recess built to fit the current television is a recess sized to one product. Screens change proportion, bezels shrink, and a 65 inch television today is not the same rectangle as a 65 inch television in six years. A tight recess turns a routine upgrade into joinery.
The safer pattern is an opening that is generously wider and taller than the screen, treated as a bay rather than a picture frame, with the television mounted centrally inside it. It looks deliberate, it accepts a different set later, and it leaves room for the soundbar that arrives two years after everything else.
Doors, and the remote control problem
Closing equipment behind doors makes a media wall look like furniture rather than a rack, and it introduces two constraints.
Infrared remotes need line of sight. A box behind a solid door will not respond, which means glass fronts, an open bay for the equipment, or accepting that the door stays open when the system is on. Some equipment uses radio rather than infrared and does not care, and mixing the two in one cabinet gives you a system that half works.
Doors trap heat. Everything in the ventilation section applies more strongly behind a closed door, so an open back stops being a nice idea and becomes the requirement.
The arrangement that works in most rooms: equipment in an open or glass-fronted bay with a braced back, and doors on the parts holding things that do not run on electricity.
Floating or floor standing
A floating media wall leaves the floor clear under it, which makes a room read as larger, makes cleaning possible and looks like the thing people pin to mood boards. It is also the version with a structural requirement.
A wall-hung run carries its own weight plus every piece of equipment inside it through its fixings, so it needs a hanging rail or a full-thickness back and something solid behind the wall surface. A thin sheet back is not a structural connection, and this is the one place in a media wall where the choice is not about convenience.
A floor-standing built-in avoids all of that, takes any weight and can be levelled on its legs against an uneven floor. In a room where the wall is questionable, or where nobody has opened it up to look, that is the sensible default.
Five decisions, in order
Decide
When
Why then
Where the power and aerial come in
Before the cabinetry is drawn
A sealed cabinet over the only socket in the room is discovered on installation day
How the equipment breathes
Before the back panels are chosen
An enclosed shelf with an amplifier in it is an oven, and heat is what kills electronics
The route every cable takes
Before the parts are cut
A notch in a shelf and an open back are free at this stage and destructive later
How you will reach it again
Before anything is fixed to the wall
The equipment will be replaced several times during the life of the cabinetry
Screen height and size
Before the opening is sized
A recess built for one television is a recess your next one may not fit
Open the back before you close the wall
Choose a braced back for the bays holding equipment and the cabinet stays square while cables and air pass freely. Set the depth from your deepest box, size the screen opening as a bay rather than a frame, and see the parts and the price before anything is fixed to a wall.
Give the air somewhere to enter and somewhere to leave, which in practice means an open or partly open back rather than a sealed sheet. Amplifiers, consoles and set-top boxes turn electricity into heat, and in a closed compartment that heat has nowhere to go but back into the equipment that made it. A braced back, meaning boards across the top and bottom of the opening with nothing between them, solves it structurally: the boards keep the cabinet square while the space between them lets air move. Fans are a patch that adds noise to the room where you are listening and fails silently.
How do you hide cables in a media wall?
Plan them as geometry before the parts are cut. Draw every run: power from the socket to each box, signal from each box to the screen, speaker cable out, aerial in. Then design for them with an open or braced back so cables pass anywhere, notches in the back edge of shelves so a cable drops between levels without being pinched, and a grommet where something has to surface. Leave slack so a box can be pulled forward to reach its own sockets, and keep power and signal out of the same tight bundle over long runs.
Should I build a recess exactly the size of my TV?
No, and it is the most common regret in a media wall. A recess sized to the current television is sized to one product, and screens change proportion as bezels shrink, so a 65 inch set in six years is not the same rectangle as a 65 inch set today. A tight recess turns a routine upgrade into joinery. Make the opening generously wider and taller than the screen and treat it as a bay rather than a picture frame, with the television mounted centrally. It looks deliberate, accepts a different set later and leaves room for the soundbar that arrives afterwards.
Can you put doors on a media cabinet?
Yes, with two constraints. Infrared remotes need line of sight, so equipment behind a solid door will not respond unless the front is glass or the door stays open while the system is on, and mixing infrared and radio equipment in one cabinet gives you a system that half works. Doors also trap heat, so everything about ventilation applies more strongly behind them and an open back stops being optional. The arrangement that suits most rooms is equipment in an open or glass-fronted bay with a braced back, and doors on the sections holding things that are not plugged in.
What depth does a media wall need?
Enough for the deepest piece of equipment plus its plug and a bent cable behind it, which is usually a couple of inches more than the box itself. The television contributes almost nothing to this, since a flat panel needs no depth. Around 12 inches suits a console, a streaming box and a router, while 16 to 20 inches takes an AV receiver or a turntable. Measure what you own rather than working from the screen size, and remember that a turntable needs clearance above it for the lid.
Should a media wall be floating or floor standing?
A floating unit leaves the floor clear, which makes a room read as larger and makes cleaning underneath possible, and it is the look most people are after. It also carries its entire weight plus the equipment inside it through its fixings, so it needs a hanging rail or a full-thickness back and something solid behind the wall surface to screw into. A thin sheet back is not a structural connection. A floor-standing built-in avoids the question entirely, takes any weight and levels on its legs against an uneven floor, which makes it the sensible default when nobody has opened the wall to look.
What should I decide before a media wall is built?
Five things, in this order: where the power and aerial come into the room, because a sealed cabinet over the only socket is discovered on installation day; how the equipment breathes, which drives the back panel choice; the route every cable takes, since a notch is free before the parts are cut and destructive afterwards; how you will reach the equipment again, because it will be replaced several times during the life of the furniture; and the screen size and height, since the opening has to suit the television you will own next rather than only the one you have.
