What is streaming audio via bluetooth

Bluetooth, AirPlay and Play-Fi Audio Streaming

One of the latest trends in home theater is streaming audio to your home theater receiver from your iOS or Android device. You can do this via an app and a Wi-Fi connection (AirPlay or Play-Fi), or via Bluetooth. But it’s not that simple; there are a myriad of ways to get your audio from your phone or tablet to your speakers. I’ll try to go over the main ways this is accomplished here, but ultimately you need to understand your needs and the pros and cons of each method.

Wi-Fi Audio Streaming

There are multiple ways for you to use your wireless home network to stream audio. You can opt for one of several proprietary formats or you can simply connect your laptop or PC to a network and use DLNA services to pull audio from your library. When we talk about Wi-Fi streaming, however, we’re typically referring to the proprietary formats. There are many, but here are a few of the leaders:

Apple AirPlay

Apple AirPlay is a Wi-Fi streaming protocol that lets you easily redirect music from your iOS device to a compatible surround receiver or powered speaker. The thing about AirPlay that makes it attractive is that, as a wireless technology, AirPlay operates on top of your home’s existing wireless network. You just connect your device to your home network, and when you activate AirPlay your iOS device will let you send your music or video to any compatible device on the network. If you happen to have multiple Airplay devices in your home, you can stream to individually or all at once.

Play-Fi

Play-Fi, which is owned by DTS, is a new streaming media format that works on compatible devices and caters in particular to the Android-powered device market. Like AirPlay, and unlike proprietary systems like Sonos, Play-Fi connects devices over your existing WiFi network. The only present issue with Play-Fi is that, being a new technology, there are only a few devices currently supporting it. Play-Fi also hasn’t partnered with many streaming media providers as of yet, so Pandora and Spotify are the primary music providers for compatible applications. Conversely, AirPlay works within nearly all of the major streaming media provider apps, giving you near-limitless sources of music.

With current Play-Fi technology, file support is limited to 16-bit 44.1kHz (CD) quality for now, but hi-res audio support at up to 24-bit resolution is on the way.

Proprietary Mesh Networks

There are a number of proprietary mesh networks that ride atop your existing WiFi network to connect devices. One of the most popular is Sonos, which has a variety of speakers and powered or unpowered access points that can be networked within a home to play music. They even have a soundbar and the ability (with their latest update) to repurpose existing Sonos speakers for use as surround channels.

Proprietary mesh networks almost universally come with both limitations and cost. They are limited to a single manufacturer and so your product selection is likely to grow very slowly. Proprietary systems are also typically very expensive because they are designed to be an ecosystem into themselves, with special control software and unique features unavailable on other systems. The Denon HEOS speakers are similar to this type of system except that, unlike Sonos, they ride atop your existing WiFi network.

Bluetooth Audio Streaming

Bluetooth wireless technology is a standard designed for short distances (it uses the band from 2.40–2.48 GHz) up to 30 feet.

You might think Bluetooth audio streaming is a single “designation”. It’s not. There are a variety of versions and profiles, but we can help clear up the most common profile used for audio streaming. The latest Bluetooth version is almost always the best, requiring the least amount of setup, giving you more flexibility and offering the highest audio quality.

Advanced Audio Distribution Profile (A2DP)

You’ll see the A2DP designation a lot when you look at Bluetooth speakers and devices for streaming audio. A2DP simply refers to Bluetooth designed for one-way transfer of stereo audio. What really matters for user interaction, setup and features is the version. There have been seven, but the latest is V.4.

Bluetooth V.4 is also called “Bluetooth Smart” and has been out since 2010. It incorporates standard Bluetooth as well as the WiFi-based Bluetooth high speed and Bluetooth low energy protocols. There were two big problems with Bluetooth that kept it from truly being adopted as a leading wireless audio standard in the past. For one, it was originally designed as a replacement for Ethernet and USB cables tethering devices together on a desktop. That means that long range connectivity was not inherent in the design. With a limit of 30 feet, Bluetooth audio is naturally limited in how it can function in a whole-home scenario. Another related issue was connectivity. Bluetooth allows for a myriad of pairing methodologies, from passcode verification to near-automatic device pairing. It is still a crapshoot as to which system any particular device will use and how easy or difficult it will be to connect. In the past couple of years, most newer Bluetooth devices have utilized better and more convenient discovery methods.

Apt-X High Quality Bluetooth Audio

The second big problem with Bluetooth is sound quality. Bluetooth audio is far inferior in quality to lossless streaming over WiFi. To combat this, manufacturer-specific layers have been added to enable functionality not available by default in standard Bluetooth. Of these, Apt-X seems to be the best, offering near-lossless quality but still optimizing the stream to take into account bandwidth requirements of the format.

Apt-X has seemingly re-made Bluetooth into a viable streaming method, particularly for portable devices and connected PCs.

Bluetooth vs. “the other” Streaming Formats

So getting back to our original topic, the issue is which makes sense for streaming audio. If you’re looking at audio quality then lossless streaming of high-resolution media streams is the way to go. Apt-X Bluetooth fits in well here, but it requires a bit more proximity to your host AV system.

AirPlay also allows for 44.1kHz lossless stereo streaming and can be a great means of sending and receiving streaming media over your existing wireless network.

What you probably want to avoid, if quality is your goal, is standard Bluetooth streaming. The stock Bluetooth is very much a lossy medium and there is a huge difference between that and a lossless file. The difference is more than a little noticeable. Unfortunately, your other options are going to be a bit more proprietary, with AirPlay leading the way and Play-Fi just starting to get out of the dugout and looking hopeful. Of course, the proprietary streaming music systems are also an option, but they are typically pricey and offer a limited range of hardware that is compatible with the network audio streaming system.

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Wi-Fi or Bluetooth streaming? The two ways to stream sound

You might ask yourself the question “is there really a big difference between streaming via Bluetooth or Wi-Fi?” And the answer is “yes.” It’s vital to know what separates these streaming methods from each other and what each of them has to offer when deciding which to use. To help you make the right choice, we’re going to break down both streaming possibilities and answer the most important questions when it comes to Bluetooth and Wi-Fi streaming,

Streaming technology – how they work

The source for audio streaming is always the same. You stream from a saved database, nowadays it’s mostly found online on an Internet server like Spotify, TIDAL and so on, however, you can also stream from local data directly to your loudspeaker. Both Bluetooth and Wi-Fi streaming use license-free frequencies to transmit audio. However, the setup and the connection of the data streams have completely different ways of working:

With Bluetooth loudspeakers, data is always exchanged directly between the transmitter and receiver. Both must be equipped with a corresponding chipset, which is provided with an individual serial number for identification. The pairing of transmitter and receiver is completed within a few seconds. Both devices can then send and receive via a permanent direct data connection that exists only between these two devices. The battery consumption of the smart device increases a little bit, especially if the smart device is connected to the cloud server via mobile internet at the same time, in order to send the music to the player.

With Wi-Fi streaming, the connection between the storage location and the loudspeaker is always via the home network. In order for the speakers and players to be able to dial into such a network, Wi-Fi must be available. This device only controls the connection. Compared to the permanent Bluetooth connection, the battery is used less.

Wi-Fi and Bluetooth in comparison

✔ Range: Here Wi-Fi has an advantage over Bluetooth. As long as the streaming devices are connected to the home network, the data transfer works. As a rule, the connection is thus guaranteed throughout the entire living area. This means even if the playback device and the loudspeaker are not in the same room. Bluetooth reaches its limits faster in terms of range. The standard also transmits signals through walls. However, the maximum range for a stable audio channel is 10 metres.

✔ Operation: When the Bluetooth connection is established, control is carried out as usual via the player. To start pairing, a button on the loudspeaker must usually be pressed first. Unless it is equipped with NFC; in this case, it is sufficient to place the smartphone or tablet on the marked area to initiate the connection. The audio stream between devices in the home network must be controlled by a streaming architecture. Examples of such technologies are of course Teufel’s own System Raumfeld, Google Cast or Apple AirPlay. The network speakers are usually controlled via an app.

✔ Formats: Bluetooth offers only a limited bandwidth for streams. Therefore audio files are converted for transmission into the lossy codec SDC. This is at the expense of sound quality. If you want to stream with better quality via Bluetooth, you should make sure that the format aptX is supported. Depending on the version, this transmits the audio stream with little or no data loss. It is important that both the loudspeakers and the playback device support Bluetooth aptX. Because Wi-Fi achieves a much higher bandwidth than Bluetooth, formats with high data volumes can also be transmitted in the home network. If you want to transmit losslessly or surround formats, you must make sure that the hardware and streaming protocols support them.

✔ Battery: Due to the permanently necessary direct connection with Bluetooth, the battery of the smart device is also more heavily loaded. With Wi-FI streaming, the smart device merely controls. Thus, once you have started streaming an album, the smart device can go into standby and the battery is saved.

✔ User-friendliness: While Wi-Fi streaming allows you to make phone calls on the side, Bluetooth streaming may only allow limited use. Multiroom is actually only usable with Wi-Fi streaming.

Wi-Fi and Bluetooth: Which standard is suitable for which area of application?

The answer to the question whether Wi-Fi or Bluetooth is better suited for audio streaming is: “First tell me where and how you want to stream.” For those who want to take their speakers to the lake, to friends or to the garden, Bluetooth is the ideal solution. Smartphone and speakers are all you need to pack. In addition, the energy consumption of Bluetooth operation is low enough that speakers with a rechargeable battery can easily provide sound for 8 hours or more.

On the other hand, if you want to transmit music wirelessly to your speakers at home, you should consider a Wi-Fi solution. The home network as streaming infrastructure is already available in almost all households. Thanks to its wide range and bandwidth, it allows convenient streaming solutions over long distances. With AirPlay and Google Cast, proven streaming protocols and control apps are also available. A network player even makes it possible to integrate a hi-fi system that was previously offline into the streaming system

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