Sachin Walls
Apple's Airport Express is a versatile device with audio input and output capabilities, making it a popular choice for audio streaming and wireless audio setups. While it lacks physical audio input ports, audio input is facilitated through iTunes, AirPlay, or other sources like Rogue Amoeba's Airfoil. The device's audio port is designed for output, and it pairs well with speakers and headphones. Airport Express has been praised for its ability to stream CD-quality music, although some users have noted limitations with older versions and the need for firmware updates. Overall, it remains a stable and reliable option for audio enthusiasts.
| Characteristics | Values |
|---|---|
| Audio input | No physical audio input port; audio input is provided by iTunes or other sources like Rogue Amoeba's Airfoil |
| Audio output | Via AirPlay protocol; can also output in analog format or as a digital PCM stream |
| Compatibility | Requires iTunes v4.6 or later; limited to 16-bit data and a 44.1kHz sample rate |
| Functionality | Can be used for audio streaming, including CD-quality streaming |
| Performance | Lack of an internal clock can cause the first few seconds of songs to be missed; performance can be enhanced by tapping into the I2S digital output |
| Modding | Modding options are available, such as adding an additional "Airplay" input or enhancing sound quality |
| Connectivity | Can be connected via Ethernet or Wi-Fi; older generations may only support Airplay1 |
| Price | Around $99-$100 |
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What You'll Learn
Audio input is provided by iTunes
The AirPort Express (AX) is a versatile device that offers both audio input and output functionality to enhance your listening experience. While the device itself lacks physical audio input ports, it seamlessly integrates with iTunes to provide a robust audio input solution.
ITunes plays a crucial role in facilitating audio input for the AirPort Express. When iTunes plays back standard audio content, such as AAC, MP3, audiobooks, or Internet music streams, it decompresses these file formats. This decompression process creates a raw, uncompressed audio stream, forming the foundation for further processing.
The uncompressed audio stream generated by iTunes is then processed using Apple's Lossless Compression. This compression process utilises a QuickTime codec to optimise the audio data for efficient streaming. By applying lossless compression, iTunes ensures that the audio quality remains intact while reducing the file size for seamless streaming.
After compression, the audio stream undergoes encryption to protect the content during transmission. The encrypted and compressed audio stream is then streamed to the AirPort Express via AirTunes/AirPlay. This wireless streaming technology enables the seamless delivery of audio content to the AirPort Express device.
Upon receiving the streamed audio, the AirPort Express performs several crucial operations. It decrypts the encrypted audio stream, decoding it to make it ready for output. The AirPort Express then has the capability to output the audio in either analog format or as a digital PCM stream, depending on the connected audio equipment.
In addition to iTunes, the AirPort Express can also receive audio input from other sources, such as Rogue Amoeba's Airfoil. However, iTunes remains the primary and most widely used audio input provider for the AirPort Express.
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Airfoil and AirPlay are other audio input sources
The AirPort Express (AX) audio port is for audio output only. Audio streams are inputted to the Express via the AirPlay protocol. There are no physical audio input ports on the device. Audio input is primarily provided by iTunes, which decompresses file formats and creates a raw, uncompressed audio stream. This stream is then compressed using Apple's Lossless Compression, encrypted, and then streamed to the AX via AirTunes/AirPlay. The AX then decrypts and decodes the stream, outputting it in either analog format or as a digital PCM stream.
Rogue Amoeba's Airfoil is another audio input source for AX. Airfoil can send audio to any valid AirPlay output, including the Apple TV, HomePod, and AirPort Express, as well as third-party devices from manufacturers like Bose and Sony. Airfoil Satellite is a free companion app for Airfoil, available for iOS, Android, Mac, and Windows. It allows users to receive audio and remotely control Airfoil on their device. Airfoil can also capture audio from hidden background processes that do not appear on a Mac like traditional applications, including system services and command-line tools.
Airfoil began in 2005 as a tool to send audio to the AirPort Express, the first AirPlay device. It has since expanded to support streaming to newer devices, such as Google Chromecast and Google Home hardware, as well as third-party televisions and stereos. Airfoil can also stream audio to multiple output devices simultaneously, all in sync, regardless of the device type.
Airfoil and AirPlay are, therefore, other audio input sources for the AirPort Express.
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The audio port on the AirPort Express is for audio output only
The AirPort Express is a versatile device that has found a place in many homes, especially for audio streaming. It is well-loved for its ease of use and stability, with some users relying on it for over 15 years. However, it is important to note that the audio port on the AirPort Express is designed for audio output only. This means that while you can connect speakers to the AirPort Express and play audio through them, you cannot use the audio port to input audio signals from external sources directly into the device.
The AirPort Express is designed to receive audio streams via the AirPlay protocol. This means that you can wirelessly stream audio from compatible devices, such as iPhones, iPads, or computers, to the AirPort Express and then output that audio through connected speakers. This creates a seamless wireless audio experience, allowing you to play music or other audio throughout your home.
While the AirPort Express does not have physical audio input ports, there are workarounds to achieve similar functionality. One common method is to use iTunes on a computer to play back audio content. iTunes can decompress and create an uncompressed audio stream, which is then compressed using Apple's Lossless Compression and streamed to the AirPort Express via AirPlay. This allows you to play various audio formats, such as AAC, MP3, audiobooks, and Internet music streams, through your AirPort Express setup.
Additionally, there are third-party software solutions like Rogue Amoeba's Airfoil that can be used to input audio to the AirPort Express. These applications may provide additional flexibility in streaming audio from non-Apple devices or older versions of iTunes that may not support AirPlay directly. By utilising these software solutions, users can expand the range of audio sources compatible with their AirPort Express setup.
It is worth noting that Apple has made updates to its Apple TV product line, which now outputs audio signals exclusively via HDMI. This change may impact users who previously relied on Apple TV's audio output capabilities and will now need to consider alternative setups, such as those utilising the AirPort Express for audio streaming.
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AirPort Express is used for internet audio streaming
The Apple AirPort Express is a portable router that can be used for internet audio streaming. It has a 3.5mm line out and a headphone jack, allowing users to connect it to a receiver or powered speakers to play audio from any Apple device. AirPlay 2 support enables multi-room streaming, allowing users to stream audio from the internet into their audio system.
AirPort Express does not upsample or resample internet audio but puts out a bit-perfect signal of the same bit depth and sampling rate of the original internet audio stream it receives. This results in audio quality that closely matches that of CDs or other streaming methods, such as Tidal's CD-quality 16/44 streaming.
To use AirPort Express for internet audio streaming, it is recommended to have the latest firmware and use Apple's AirPort Utility to ensure the device gets the strongest wireless signal. Users can also connect the AirPort Express to a receiver via an optical cable using a toslink adapter.
While AirPort Express can be used for internet audio streaming, it does not have an audio input port. Audio streams are input via the AirPlay protocol, and iTunes primarily provides audio input for the device, decompressing and converting audio formats into a raw, uncompressed audio stream.
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AirPlay compatible receivers can get audio from their line-in and play it over AirPort Express
AirPlay 2 support has been added to the AirPort Express, allowing for multi-room streaming. To use AirPlay 2, you need to switch on the receiver and select the correct input. AirPlay 2 also allows for synchronised streaming to multiple devices, which is important to avoid a slight echo effect or audio that is separated by several seconds.
To use AirPlay 2 with AirPort Express, you can follow these steps:
- Plug your AirPort Express into a wall outlet and wait for it to boot up.
- Connect to the AirPort network on your iPhone, iPad, or Mac.
- Launch the AirPort Utility app and check for any pending software updates.
- Connect your speakers to the AirPort Express via an AUX (Analog/Optical Audio Jack) cable.
- Add your AirPort Express as a new HomeKit accessory in the Home app.
- You can now stream music to your AirPort Express-powered speakers from any Apple device.
AirPort Express can be used as a cost-effective way to add AirPlay 2 functionality to your speaker system, without utilising its WiFi router capabilities. This allows users to stream audio from the internet or iTunes into their audio system with improved sound quality.
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Frequently asked questions
Apple Airport Express is a \$99 device that allows users to stream audio from the internet into their audio system.
The audio quality is CD-quality 16/44 streaming. However, the device is limited to 16-bit data and functions only at a 44.1kHz sample rate.
Apple Airport Express works with iTunes v4.6 or later, on both PCs and Macs.
Yes, you can connect Apple Airport Express to your stereo system using a 3.5" aux cable. However, you will need to have a computer in between to compress the audio source and feed it to the speakers.
