How good your digital music sounds often comes down to which file format it's encoded in. Be that as it may, every Mac audio setup is only as strong as it's weakest link, and if your Bluetooth connection isn't up to scratch, even the best BT headphones will fail to deliver a decent wireless listening experience.

By design, all Bluetooth devices support the low-power SBC audio compression codec as standard. Fortunately, modern Macs also support AAC (Apple's preferred iTunes codec) and aptX, which Android devices often use. These two codecs offer higher quality audio and generally lower latency than SBC, which is why most third-party wireless headphones on the market support one or the other, and sometimes both.

mac bluetooth audio codec aptx aac
Yet for whatever reason, despite their AAC/aptX support, some headphones fall back to the bog-standard SBC codec when connected to a Mac. This can lead to a particularly underwhelming audio experience, not to mention latency-related sync issues, which will be a distinct concern if you use your headphones while gaming or watching movies.

Thankfully, it's possible to force macOS to connect to your headphones using one of the two superior codecs. In this article, we'll show you how to do so using Apple's Bluetooth Explorer utility. (And if you're comfortable opening a Terminal window, we've included a couple of commands at the end that do the same thing.)

Bluetooth audio codecs
But first, it's worth checking which codecs your brand of headphones actually supports: Look for codec logos on the box, and make sure to check for references to codecs in the manual and any accompanying/online spec sheets.

Once you've established that your headphones support aptX and/or AAC, you'll want to identify which codec is being activated when you connect the headphones to your Mac. Follow these steps to find out.

How to Identify Which Bluetooth Codec is Active

  1. Establish a Bluetooth connection between your Mac and headphones in the normal manner.

  2. Play some audio on your Mac so that it's streaming to the headphones.

  3. Now hold down the Option (Alt) key and click on the Bluetooth symbol in the menu bar. (If you don't see it there, you need to check Show Bluetooth in menu bar in System Preferences -> Bluetooth.)

  4. Hover your mouse cursor over the headphones in the connection list. You should see the headphones' Active Codec shown in grey.
    active bluetooth codec macos

If your headphones are using AAC or aptX, you don't need to do anything. Without going into the technical details, both standards provide relatively stable wireless connections and – as far as Bluetooth goes – comparably decent sound quality. However, if the codec shown is SBC, you'll probably want to change it. Here's how.

How to Force-Enable aptX and AAC Codecs in macOS

  1. Open a web browser, navigate to Apple's developer downloads page, and download Additional Tools for Xcode 9 [Direct Link] which contains Apple's Bluetooth Explorer utility. Note that to access the page you'll need to register for a free Apple developer account if you don't already have one. Alternatively, use Google to find the Bluetooth Explorer utility hosted elsewhere and skip to step 5, but if you're not downloading from Apple, be sure to screen the file for malware.
    xcode developer tools

  2. Once downloaded, double-click the Additional Tools dmg file to mount it on your desktop.

  3. Open the Additional Tools drive and navigate to the Hardware folder.

  4. Open your Mac's Applications folder in another Finder window or tab.
    Bluetooth Explorer copy

  5. Drag Bluetooth Explorer into your Mac's Applications folder and launch the app from there.

  6. From the Bluetooth Explorer menu bar, select Tools -> Audio Options.

  7. In the Codecs section, tick the checkboxes alongside Enable AAC and/or Force use of aptX (depending on your issue). Make sure Disable AAC and Disable aptX are left unchecked.
    Bluetooth Utility codec enable

  8. Click Close to finish.

  9. Restart your Mac, or reset the Bluetooth module.

When your Mac reboots, you can confirm that the codec change has been applied by following the first series of steps in this article.

Terminal commands for enabling AAC and aptX Codecs

To enable aptX, input the following command, press Enter, and type your user password if prompted:
sudo defaults write bluetoothaudiod "Enable AptX codec" -bool true

Alternatively, to enable AAC, input the following and press Enter:
sudo defaults write bluetoothaudiod "Enable AAC codec" -bool true

To disable either codec via Terminal, simply replace -bool true with -bool false at the end of the command.

Top Rated Comments

jb-net Avatar
80 months ago
Sadly, Apple doesn't seem to support aptX on iOS :(
Score: 8 Votes (Like | Disagree)
fitbunny Avatar
80 months ago
What I always wanted to know is: when listening to iTunes music already encoded in AAC, will it pass-through or re-encode in AAC? Because you potentially loose the benefits of good compression if you recompress. This came to my mind when finding out about albums that sound bad because they are recompressed themselves.
I have read in multiple sources that all audio is reencoded to AAC whether it comes from itunes as AAC or not. However, all the sources say that this reencoding does not cause much of a quality loss because AAC as a codec is transparent even after 100 reencodings. I use beoplay e8 and the sound is the best I have ever listened to with Bluetooth headsets that I have used so far and I have used quite a few aptx headsets by Sennheiser. The only problem with the above tutorial is that the setting are lost when reconnect your beoplay e8. I used sudo and normal user to change the plist instead of using the gui and the settings seem to be saved now. here is the commands that I used:
defaults write bluetoothaudiod "Enable AAC codec" -bool true

defaults write bluetoothaudiod "AAC Bitrate" 320

sudo defaults write bluetoothaudiod "Enable AAC codec" -bool true

sudo defaults write bluetoothaudiod "AAC Bitrate" 320
Score: 8 Votes (Like | Disagree)
levitynyc Avatar
80 months ago
iPhones don’t support APTX which blows.
Score: 5 Votes (Like | Disagree)
Lasermoon Avatar
44 months ago

Anyone know if there is a way to verify which codec us being used in big sur? The option click on blueooth does not bring up the codec option like it used to in previous versions of mac OS.
Yes. I had to use bluetooth explorer > Audio Graphs
Score: 4 Votes (Like | Disagree)
timmyh Avatar
80 months ago
Interesting! I suspect Apple’s own audio devices, such as AirPods, and all of their newer OSs, support AAC?
Correct!
Score: 4 Votes (Like | Disagree)
RedGala Avatar
80 months ago
Great article. This is what macrumors is all about.
Score: 4 Votes (Like | Disagree)

Popular Stories

iOS 18 Apple Music Messages and Notes Feature 1

iOS 18 Rumored to Add New Features to These 15 Apps on Your iPhone

Tuesday April 30, 2024 10:44 am PDT by
Apple is expected to announce iOS 18 during its WWDC keynote on June 10, and new features have already been rumored for many apps, including Apple Music, Apple Maps, Calculator, Messages, Notes, Safari, and others. Below, we recap iOS 18 rumors on a per-app basis, based on reports from MacRumors, Bloomberg's Mark Gurman, and others: Apple Maps: At least two new Apple Maps features are...
maxresdefault

Apple Event Rumors: iPad Pro With M4 Chip and New Apple Pencil With Haptic Feedback

Sunday April 28, 2024 6:19 am PDT by
In his Power On newsletter today, Bloomberg's Mark Gurman outlined some of the new products he expects Apple to announce at its "Let Loose" event on May 7. Subscribe to the MacRumors YouTube channel for more videos. First, Gurman now believes there is a "strong possibility" that the upcoming iPad Pro models will be equipped with Apple's next-generation M4 chip, rather than the M3 chip that...
iPad Pro OLED Feature 2

Apple to Use 'Best OLED Panels on the Market' for Upcoming iPad Pro

Monday April 29, 2024 10:04 am PDT by
Apple's upcoming iPad Pro models will feature "by far the best OLED tablet panels on the market," according to Display Supply Chain Consultants. Set to be announced on May 7, the OLED iPad Pro models will feature LTPO (a more power efficient form of OLED), a 120Hz ProMotion refresh rate, and a tandem stack and glass thinning that will bring "ultra-thin and light displays" that support high...
iOS 18 General Notes Feature 2

iOS 18 Rumored to 'Overhaul' Notes, Mail, Photos, and Fitness Apps

Sunday April 28, 2024 6:44 am PDT by
Bloomberg's Mark Gurman today said that iOS 18 will "overhaul" many of Apple's built-in apps, including Notes, Mail, Photos, and Fitness. Gurman did not reveal any specific new features planned for these apps. It was previously rumored that the Notes app will gain support for displaying more math equations, and a built-in option to record voice memos, but this is the first time we have...
iPad Air 5 Colors

Apple's M1 iPad Air Drops to New Low Price of $399.99 at Best Buy

Monday April 29, 2024 7:12 am PDT by
Best Buy today has discounted Apple's M1 iPad Air (64GB Wi-Fi) to a new all-time low price of $399.99 in the Starlight color option, down from $599.99. Best Buy says this deal will last through the end of the day, and it's only available in one color at this record low price. Note: MacRumors is an affiliate partner with Best Buy. When you click a link and make a purchase, we may receive a...
maxresdefault

Apple Announces 'Let Loose' Event on May 7 Amid Rumors of New iPads

Tuesday April 23, 2024 7:11 am PDT by
Apple has announced it will be holding a special event on Tuesday, May 7 at 7 a.m. Pacific Time (10 a.m. Eastern Time), with a live stream to be available on Apple.com and on YouTube as usual. The event invitation has a tagline of "Let Loose" and shows an artistic render of an Apple Pencil, suggesting that iPads will be a focus of the event. Subscribe to the MacRumors YouTube channel for more ...
ios 17 5 repair state

iOS 17.5 Includes 'Repair State' Option That Doesn't Require Turning Off Find My for Service

Tuesday April 30, 2024 1:24 pm PDT by
With iOS 17.5, Apple is adding a "Repair State" feature that is designed to allow an iPhone to be sent in for service without deactivating Find My and Activation Lock. The fourth iOS 17.5 beta that came out today adds a "Remove This Device" option for all devices in Find My, and using it with an iPhone puts that iPhone into the new Repair State. Right now, sending an iPhone to Apple to be...