What is second screen behavior?

Second screen behavior is when viewers use a phone or tablet while watching TV or streaming. For Gen Z and Millennials, it’s now a natural extension of the viewing experience.

How common is second screen use among Gen Z and Millennials?

Very common. 85–89% of Gen Z use a mobile device while watching TV, and over 76% of Gen Z and Millennials say they often or always browse the internet on a second device. Smartphones are the dominant second screen, with ownership near universal.

What do people do on their second screens while watching?

Typical activities include checking social media and messages, looking up show-related info, and shopping links tied to what’s on screen.

Why does second screen behavior matter for streaming platforms?

It’s the norm, not the exception. Managed well, it drives deeper engagement, longer watch time, stronger retention, and new monetization opportunities.

How does Sound Dimension’s AiFi use the second screen?

AiFi turns phones into synchronized speakers, integrating them into the sound experience for social listening, surround sound across devices, and immersive group sessions.

How does AiFi improve engagement instead of causing distraction?

By keeping the phone inside the experience: the second screen becomes a sound extension of the story, reinforcing immersion rather than pulling viewers into competing apps.

Can second screen behavior help content go viral?

Yes. Second screens are where conversations happen. Shared listening and synchronized group moments are inherently social, boosting organic sharing and recommendations.

What monetization opportunities does AiFi unlock?

Premium synchronized live events, upsells for group sound experiences, sponsorships and branded events, plus audience intelligence on participation and session behavior.

How does AiFi help reduce churn?

AiFi makes the phone an extension of the platform, not an exit point. Synchronized sound across devices increases watch time, strengthens social bonds, and lowers churn.

How can I see AiFi in action?

Book a demo with Sound Dimension to experience how AiFi transforms second screen behavior into deeper engagement, social amplification, and measurable revenue.

Multi-Device Audio Playback API For Shared Sound

Why Watch on Three Screens but Listen on One

Most of us stream across a small army of devices, switching between phones, laptops, TVs, and tablets without a second thought. Video has kept up with this multi-screen life, yet audio is still stuck on a single, lonely output. You might have a TV playing a show, a laptop open to a watch party, and a phone in your hand, but only one of those devices is doing the heavy lifting for sound. That mismatch breaks immersion and makes shared viewing feel flatter than it needs to be.

At Sound Dimension, we asked a simple question: why watch on three screens but listen on one? Multi-Sound is our answer. Powered by our AIFi software, it is the missing layer that lets platforms treat a user’s personal fleet of devices as a single, perfectly synchronized sound stage. In this article, we explain what Multi-Sound is, how the AIFi multi-device audio playback API works, and why it matters for anyone building music, video, or commerce experiences in a multi-device world.

What Multi-Sound Is and How AIFi Powers It

Multi-Sound is a software-only social audio infrastructure that turns existing phones, speakers, and screens into one shared, synchronized sound stage. Instead of thinking in terms of one device and one output, Multi-Sound treats every compatible device in the room as a potential part of the same audio experience. The result is surround-style, room-filling sound created entirely from hardware users already own.

At the core is AIFi, our multi-device audio playback API and SDK. Platforms integrate AIFi to orchestrate all connected devices as a single sound system, without rewriting their entire audio stack. AIFi gives developers the tools to discover nearby devices, enroll them into a shared sound stage, and keep everything playing in sync. From a product perspective, it becomes a new social audio layer that rides on top of your existing streaming or playback logic.

Because AIFi is pure software, there are no proprietary speakers, no boxes to ship, and no special gear users need to buy. If a device can run your app or connect to your platform, it can potentially join the sound stage. This hardware-agnostic approach lets Multi-Sound fit naturally into multi-platform strategies, whether your users are on mobile, web, or TV apps.

Infinite Scale, One Synchronized Sound Stage

Multi-Sound is built around a simple idea: infinite scale. Any compatible device in the room can become part of the sound stage, regardless of brand, OS, or form factor. Phones on the coffee table, a TV on the wall, a tablet in the kitchen, and laptop speakers at a desk all can be orchestrated into one coherent system that feels far larger than the sum of its parts.

The hard part in multi-speaker experiences is not just playing audio on many devices; it is keeping them perfectly aligned. If you have ever heard echo, phasing, or a noticeable lag between two speakers, you know how quickly the illusion falls apart. AIFi’s synchronization logic focuses on that problem, keeping playback glued together so each device reinforces the others instead of fighting them.

Think about a few everyday scenarios:

A living room watch party where the TV provides the main sound image, while phones and tablets around the room add width and presence
A co-working space where several laptops join a shared playlist, turning scattered speakers into a background audio layer
A dorm room hangout where everyone’s device becomes part of the same track or stream, creating a social, shared listening moment

For developers, this is where the multi-device audio playback API really matters. Instead of building your own sync architecture, device discovery workflow, and timing logic, AIFi provides these capabilities as a ready-made layer. You focus on how the experience should feel, not on the low-level engineering required to make several devices act like one.

Instant Immersion with Hardware Users Already Own

People rarely want to pause a show or a live event to wrestle with settings. Multi-Sound is designed around instant immersion, so shared sound feels natural and low friction. Users should be able to tap into Multi-Sound, choose which of their devices participate, and hear the sound stage expand in real time as devices join.

Compared with traditional home audio, the difference is clear. Conventional setups usually mean:

Closed ecosystems and brand lock-in
Expensive hardware and dedicated speaker purchases
Rigid room layouts and one primary listening position

With AIFi and Multi-Sound, the model flips. Instead of asking users to invest in new gear, we build on the speakers already in their pockets, bags, and on their desks. The room adapts to the users and their devices, not the other way around.

This leads to fresh social and commercial use cases that keep people engaged with your platform:

Shared listening sessions where groups co-create the sound stage and feel more present together
Live shopping streams where synchronized audio supports presenters, product close-ups, and audience reactions at once
Richer watch parties where every participant contributes both a screen and a speaker, deepening the sense of presence and participation

Pure Software, Real Benefits for Platform Builders

Because AIFi is pure software, the strategic upside for platforms goes well beyond sound quality. There is no supply chain to spin up, no inventory to manage, and no hardware support burden. You add a capability, not a product line, which keeps your focus where it belongs: on your core experience.

The multi-device audio playback API also opens up new product directions. For example, you can explore:

Premium audio tiers that offer Multi-Sound as a value-add for power users
Social listening or watch modes that encourage people to bring friends into the experience
Differentiated multi-room or multi-device features that go beyond what single-output competitors can offer

Integration is designed to fit into existing architectures. AIFi works as an SDK and API layer that can be added without ripping out your current audio pipeline. That matters in cross-platform environments where web, mobile, and TV apps need to share logic and behavior while still respecting device-specific constraints.

From a business perspective, better shared experiences usually translate into longer sessions, more repeat visits, and stronger reasons for users to invite others in. When every additional device not only shows your content but also joins the sound stage, your platform becomes a place to gather, not just a place to press play.

Hear Multi-Sound in Action and Build for a Multi-Device World

All of this becomes much clearer once you hear it. We provide a live web demo where you can sync your own devices, trigger Multi-Sound, and experience AIFi’s synchronized sound stage directly. The first thing people tend to notice is what is missing: there is no distracting echo or timing drift. Instead, several small speakers suddenly behave like one coherent system that fills the space.

At Sound Dimension in Sweden, we believe that as you build for a multi-device world, you should not leave audio behind. Video already flows across screens, social features already span multiple devices, and user expectations are only moving further in that direction. Multi-Sound and our AIFi multi-device audio playback API give you a way to let audio keep pace by turning every screen into part of a shared sound stage.

Transform Your Audio Experience With Seamless Multi-Device Sync

Bring immersive, room-filling sound to your product by integrating our multi-device audio playback API into your audio solution. At Sound Dimension, we help you synchronize multiple speakers or devices effortlessly so your users enjoy a unified, high-quality listening experience every time. If you are ready to explore performance, licensing, or integration details tailored to your use case, contact us and we will work with you to define the right next step.