Modern users often find themselves in situations where they need to stream audio from a desktop computer or laptop to a mobile device. This may be necessary to create a homemade audio system, use a smartphone as a wireless speaker, or provide background sound in another room. Fortunately, this task doesn't require complex equipment or additional wiring; all you need is a stable connection. local connection.
The technology of transmitting sound over the air has long ceased to be the prerogative of expensive Hi-Fi systems. Today, any Android- A smartphone and a Windows PC can exchange media data with minimal latency. The key requirement here is that both devices are on the same network, which allows for the transfer of digital signal without the loss of quality inherent in analog methods.
In this article, we'll take a detailed look at the software and hardware aspects of setting up such a connection. You'll learn which protocols are used for streaming, how to properly configure a firewall, and which applications will ensure the best synchronization. We'll cover both the operating system's built-in tools and third-party solutions, which often prove more flexible.
Technical requirements and network preparation
Before you begin configuring the software, you need to ensure that your network infrastructure is working properly. The main requirement is that the computer and phone are in the same network. local network (LAN). This means that both devices must be connected to the same router, either via Ethernet cable or Wi-Fi.
The quality of transmitted audio and the absence of latency directly depend on the channel's bandwidth. If you plan to broadcast high-definition audio or use a multichannel format, it is recommended to use the standard Wi-Fi 5 (802.11ac) or newer. The 2.4 GHz frequency is susceptible to interference from microwave ovens and nearby networks, which can cause artifacts in the sound.
- 📡 Make sure both devices are connected to the same subnet (e.g. 192.168.1.x).
- 🔒 Check your Windows Firewall settings to allow incoming connections for the selected application.
- 📶 Use the 5 GHz band to minimize interference and reduce ping.
⚠️ Note: If your router is configured in "Guest Network" mode for one of the devices, they may not be able to see each other. Guest networks often isolate clients from each other for security reasons.
It's also worth paying attention to the IP addresses of your devices. To ensure stable operation of server applications on your computer, it's advisable to reserve a static IP address in your router settings. This will save you from having to reconfigure the client application on your phone every time the router assigns a new dynamic address to your computer.
Using built-in Windows functions and the DLNA protocol
The Windows operating system has built-in mechanisms for streaming multimedia based on the standard DLNA (Digital Living Network Alliance). This method is ideal for playing music files stored on a PC's hard drive, but is less suitable for transmitting system audio in real time.
To enable this feature, open the Control Panel and find the section for media streaming. The path may vary in modern versions of Windows 10 and 11, but the basic idea is the same: allow access to media libraries for detected devices on the network. Once enabled, your computer will be visible as a media server.
On your smartphone, you'll need a client app that supports DLNA/UPnP. Popular options include VLC for Android, BubbleUPnP or standard players built into the manufacturer's shell (for example, Mi Music or Samsung Music). In the playback menu, you need to select the "Local Network" or "Renderer" source, where your computer will be displayed.
| Parameter | DLNA / UPnP | Specialized software |
|---|---|---|
| Transmission type | Files and libraries | Real-time system audio |
| Latency | Not applicable (file) | Low (20-100 ms) |
| Setting up | Built into the OS | Requires software installation |
| Quality | No loss (original) | Depends on the codec and network |
It's important to understand the limitations of this method. DLNA can't capture audio from other programs (browsers, games, system notifications). It's designed exclusively for file access. If your goal is to stream audio from YouTube or a game to your phone, this method won't work, and you'll need to turn to more advanced solutions.
Applications for broadcasting system audio (SoundWire and similar)
To transmit system audio (what you hear in headphones connected to your PC) in real time, specialized programs operating on the client-server principle are required. The leader in this niche for many years has been the application SoundWire, which demonstrates excellent stability and low latency.
The principle behind these programs is simple: a server component is installed on the computer, which intercepts the audio stream, compresses it, and sends data packets over the network. A client component is installed on the phone, which receives the packets, decodes them, and plays them through the speaker or headphones connected to the smartphone. The entire process takes a fraction of a second.
Besides SoundWire, there are alternatives such as AudioRelay or Wo MicThey offer similar functionality, but may differ in interface, supported codecs, and the availability of paid features. For example, AudioRelay is known for its modern design and support for high-quality codecs in its paid version.
⚠️ Warning: Antivirus software or the built-in Windows firewall may block the connection on first launch. Be sure to allow network access for the server portion of the app when prompted.
Setup is usually straightforward. After installing the server on your PC and the client on your phone, launch both applications. If the devices are on the same network, they often find each other automatically. Otherwise, you'll need to enter the computer's IP address, which is displayed in the server program interface, into the corresponding field on your smartphone.
☑️ SoundWire Setup Checklist
Streaming via browser and local server
If installing additional software on your computer is not possible (for example, at a workstation with restrictions), you can use the capabilities of modern browsers. This method is based on broadcasting a browser tab or the entire screen via protocols supported by Chromecast or AirPlay, provided the appropriate emulation or extensions are installed on the PC.
However, a more versatile approach is to create a local web server. There are lightweight programs that convert a music folder or audio stream into a web page. By opening the provided IP address in a smartphone browser (such as Chrome or Safari), you can access the player that controls the audio on your computer.
This method is advantageous because it's cross-platform. You don't need any specific drivers; any modern web browser is sufficient. The audio quality in this case depends on the server's bitrate and the JavaScript player's processing speed on the mobile device.
How to reduce latency when streaming through a browser?
To minimize buffering, reduce the buffer size in the local server settings (if available). Also, close any unnecessary browser tabs on your phone to free up CPU resources for decoding the audio stream.
It's worth noting that this method is more often used for file playback than for streaming audio from other applications (games, Zoom, Skype). For tasks requiring low latency, native applications remain the preferred choice due to optimized interaction with the operating system's audio drivers.
Adjusting sound quality and eliminating delays
One of the main problems with wireless audio transmission is desynchronization, especially if you're using a phone to watch a video running on a PC. Latency occurs due to the time required for encoding, network transmission, buffering, and decoding the signal.
Most advanced apps allow you to adjust the buffer size. Decreasing the buffer size reduces latency but increases the risk of audio interruptions (crackling, stuttering) on unstable Wi-Fi. Conversely, increasing the buffer size makes playback smoother but increases the lag between audio and video.
- 🎚️ Experiment with the buffer settings in the client application to find your balance.
- 📉 Close background downloads on your PC and phone to free up Wi-Fi bandwidth.
- 🔌 Use an Ethernet cable for your computer to avoid losses in the PC-Router segment.
It is also important to pay attention to the sampling frequency and bit rate. Audio transmission in the format CD Quality (44.1 kHz / 16 bit) Requires fewer resources than High-Resolution Audio. In congested networks (overloaded with neighbors or other devices), reducing the quality to FM radio or 128 kbps MP3 can dramatically improve connection stability.
Using a smartphone as a microphone for a PC
While the main question was about audio output, the technology also works in the opposite direction. Many of the applications mentioned above (for example, Wo Mic or the same SoundWire (in microphone mode), allow you to use a high-quality smartphone microphone for recording or communicating on a computer.
This is especially important for streamers or video conference participants whose built-in microphones in laptops or webcams are of poor quality. Connecting via Wi-Fi eliminates the need to run long AUX cables across the room.
The setup process is mirrored: a server driver is installed on the PC, creating a virtual recording device, and an application that sends audio is installed on the phone. In Windows, you then simply select "Virtual Microphone" as the default input device in the sound settings or in the specific application (Discord, Skype).
⚠️ Caution: When using your phone as a microphone, monitor its battery level. Continuously streaming audio over Wi-Fi and using the microphone can quickly drain your smartphone's battery. It is recommended to keep your device charged.
Frequently Asked Questions (FAQ)
Is it possible to transfer audio from iPhone to Android via Wi-Fi?
Yes, it's possible, but the functionality may be limited. Protocols like Apple's AirPlay don't work natively with Android. You'll need cross-platform apps like AudioRelay, which has versions for both iOS and Android, or DLNA servers to transfer files.
Why does the sound cut out or crackle when playing?
The most likely cause is an unstable Wi-Fi connection or channel congestion. Try switching to a 5 GHz frequency, moving closer to the router, or reducing the bit rate in the app settings. Also, check if background downloads are running on other devices on the network.
Does audio transmission affect internet speed?
Streaming audio within a local area network (LAN) does not consume your internet traffic (WAN), since the data does not go beyond your router. However, it