AUDIO & VIDEO

Multiroom audio and video, designed as one system

Most homes end up with audio and video that grew by accident — a soundbar here, a pair of wireless speakers there, a television that nobody can switch on without three remotes. It works, more or less, until someone else has to use it.

A properly designed system is a different proposition. Every room has sound where sound is wanted and silence where it is not. Any source can play in any room, alone or in step with the rest of the house. There is one way to control it, and it is obvious. And when something goes wrong, it can be diagnosed remotely rather than by trial and error.

What follows is how we approach that, and the decisions that determine whether it works well or merely works.

Zones are decided by how a room is used

The first question is never which loudspeaker. It is what each space is for.

Background listening — a kitchen, a hallway, a terrace during dinner — sits comfortably around 60 to 70 dB SPL. Music is present but conversation is effortless. Foreground listening, where people sit down to listen or a room becomes the party, runs at 75 to 85 dB and needs several times the acoustic output to get there without strain.

That single distinction drives everything downstream: how many loudspeakers a room needs, how much amplification, and whether in-ceiling units are adequate or the room deserves something with a real cabinet behind it. A living room specified as background and then used as foreground will disappoint at exactly the moment it matters.

Room acoustics matter here too, and are usually ignored outside the cinema. Open-plan spaces with stone floors, glass and hard plaster are reverberant. In those rooms, more loudspeakers at lower individual output produce far better intelligibility than fewer loudspeakers working hard — the direct-to-reverberant ratio improves, and music stops fighting the room.

Loudspeaker selection is a construction decision

Where loudspeakers can go is settled during construction, not afterwards, and it constrains everything:

• In-ceiling — the discreet default for background zones. Needs enough plenum depth and, in bedrooms and apartments, a back-box to stop sound passing to the room above or next door.
• In-wall — better imaging for seated listening because the drivers are at ear level rather than overhead. Needs stud spacing planned in advance.
• Invisible / plaster-over — where the architecture will not tolerate a visible grille. Excellent for background, with real limits in the bass.
• Cabinet loudspeakers — still the best sound per euro, when the room allows them.
• Outdoor — landscape and terrace units rated IP65 or better. In the Algarve, salt air and summer UV are the real test, not rain.

We work with Sonos, Triad and Anthem among others, and the choice follows the room rather than the brand.

Distribution: how sound and picture actually travel

There are three ways to move audio around a house, and they are not interchangeable.

Wireless streaming is simple and flexible, and depends entirely on the wireless network being properly designed. It is excellent for retrofits and for rooms added later.

Centralised amplification over speaker cable puts the amplifiers in one rack and runs cable to passive loudspeakers. It is the most robust approach, the easiest to service, and the one that ages best — the electronics can be replaced in fifteen years without touching a wall.

Audio over IP carries audio as network data. It scales to large properties gracefully and integrates with video distribution, but it turns the network into a critical system rather than a convenience.

Video is a similar choice. Short runs are direct HDMI. HDMI 2.1 carries up to 48 Gbps — enough for 4K at 120 Hz or 8K — but only over short, high-quality cable. Beyond a few metres, distribution moves to HDBaseT, which carries 4K up to about 100 m over Cat6a, or to video over IP, which uses the data network and scales to any number of sources and displays.

The network is the part that decides whether any of it works

This is the single most common failure in installed AV systems, and it is almost never the fault of the AV equipment.

Audio and video over IP use multicast: one source transmitting to many receivers simultaneously. On a network switch that does not handle multicast correctly, that traffic is flooded to every port, and the network saturates. IGMP snooping — the mechanism that confines multicast to the ports that asked for it — is not optional on these systems, and consumer switches either lack it or implement it badly.

Practical requirements for a house with distributed AV:

• Managed switches with IGMP snooping and an active querier
• Cat6a cabling, which supports 10 Gigabit to 100 m and leaves headroom for what comes next
• Uncompressed video over IP wants 10 Gigabit; lightly compressed streams work over 1 Gigabit
• VLAN separation so that AV traffic, control, security cameras and family internet do not compete
• Wireless access points placed by survey, not by convenience — and cabled back, never meshed, wherever a cable can be run
• PoE budget calculated for the actual load, with headroom

We design the network as part of the AV system rather than as something the electrician provides. When AV is unreliable in an otherwise good installation, the network is where to look first.

Control is what the client actually experiences

Everything above is invisible. What the household lives with is how it is operated.

We integrate audio and video into Control4 and KNX, which means the same interface that dims lights and sets temperature also plays music. One app, one set of keypads, one logic. A single button by the door that turns off every source, every screen and every light in the house is a small thing that gets used every day.

Two principles we hold to. First, anything used daily must have a physical control — a keypad, a button, a remote. An app is a supplement, not a substitute, and a house that cannot be operated when a phone is flat is badly designed. Second, the system must be legible to a guest without instruction. If it needs explaining, it is wrong.

Calibration, and why zones are not equal

A loudspeaker in a plastered ceiling behaves differently from the same loudspeaker in a beamed one. Corner placement adds bass; a hard, reflective room adds harshness. Each zone is measured and equalised so that music sounds like music everywhere, rather than being correct in one room and merely loud in the others.

Levels are aligned across zones too, so that moving through the house does not mean walking from too quiet into too loud. Where a zone spans an open-plan space, delay alignment prevents the smearing that makes lyrics unintelligible while somehow still being audible.

How a project runs

1. Survey. Room by room: what each space is for, how it is used, what the construction allows.
2. Design. Zones, loudspeaker positions and types, amplification, distribution method, network and rack layout — issued as drawings the builder and electrician can work from.
3. First fix. Cabling, back-boxes and conduit while the walls are open. This is the only stage that cannot be revisited later without damage.
4. Second fix and commissioning. Equipment, configuration, zone calibration, control programming.
5. Handover and support. The household is shown how it works, and the system is monitored and maintained afterwards.

Retrofitting an existing house

Not every project starts with open walls. In finished houses we use wireless streaming zones, existing cable routes, and loudspeakers that fit the openings already there. The result is genuinely good, with two honest limits: bass is constrained by what a retrofit enclosure can do, and every zone depends on wireless coverage that has to be verified rather than assumed.

Where a renovation is planned, even a modest amount of cable pulled at the right moment removes those limits permanently. The cost of conduit during construction is trivial; the cost of it afterwards is a wall.

Working with iHome

We have been designing audio and video systems in Algarve homes since 2006, as an official Control4 dealer and certified KNX partner, internationally awarded by Control4. Our showroom in Quinta do Lago is set up so that the differences described here can be heard rather than argued about.

Call (+351) 289 090 900 or email geral@ihome.pt to arrange a visit or discuss a project.