Otherwise, maybe the headphone's bluetooth just has a weaker signal. Make sure the headphones are near the computer when connecting, and that there aren't a lot of electronics around causing interference. It could be a bluetooth signal quality issue, since it is generally going to negotiate the connection based on the available bandwidth/signal quality it sees. Maybe a difference in headphones, but that's just a guess. Sorry, something went any idea why you'd be getting 256 and I'd be getting 221kbps bitrate? AAC is also patented by a larger consortium of companies, in which any perceived gains (more power than money) are diluted across multiple beneficiaries/competitors, whereas aptX's gains help a single beneficiary (Qualcomm), which Apple would see as a bigger threat. Maybe it's extra tricky because aptX is proprietary and patented? Apple might be unable/unwilling to support it and have to hand over money to the patent holders.ĪAC is also patented, requiring licensing fees for manufacturers, although dropping aptX does decrease Apple's licensing burden from two to one. Though it was probably only ever used by a tiny number of people in the first place. That's concerning for anyone who prizes audio quality over bad about aptX going away, but it seems like it has. One quote from the article, in which "any instance" included several Android phones, plus an iPhone:ĪAC doesn't reach frequencies high enough to match CD quality or standard Bluetooth's SBC in any instance. Not sure how this all corresponds to MacOS, but just some food for thought. This is all for mobile, though, and is focused on sound quality, not other aspects like power/battery efficiency. On iOS, AAC is definitely better than on Android, but not necessarily better than SBC. On Android, it's recommended to disable AAC altogether, and use SBC (if you don't have aptX). Interestingly, the top of this site references a "SoundGuys" article as evidence for doing all this, and yet SoundGuys also published this other article just a couple days before the one above, stating that AAC isn't all that great, even compared to SBC - at least tested within the mobile device realm. When I searched with "aac", I found a few lines like these:Ġ2:41:48.587446-0400 bluetoothaudiod New AAC Bitrate:256000Ġ2:41:48.586376-0400 bluetoothaudiod AAC encoder initialized. The output on Catalina wasn't as clear-cut with a single line like on Monterey, so people may need to try other search terms with older versions, like "aac" or "sbc", depending on what you're looking for. I also checked on my older work Mac, which is still on Catalina, and the "Console" app on Catalina doesn't have a "Start" button - so for older systems like this, you can just skip that step above, since the log entries just start loading automatically. After a few seconds, you should see a bunch of lines appear, including one starting with "A2DP", like this:Ġ0:48:15.750396-0400 bluetoothdĚ2DP configured at 44.1 KHz.Re-connect your headphones while looking at the Console output.In the "Search" field, in the upper-right corner, type "Codec", and hit "Enter".Open the "Console" app (Under "Applications/Utilities").I can't speak for all MacOS versions, but I do this on Monterey: The retransmission rate is a function of distance and interference, and you'll need to disconnect/reconnect on each attempt before you find the sweet defaults write bluetoothaudiod "Enable AAC codec" -bool true The retransmission percentage is roughly equivalent to packet loss, and if you increase the bitrate too high your audio will start cutting out: You can increase the AAC bitrate in Audio Options but be sure to keep an eye on the graphs. Open the dmg, and open Bluetooth ExplorerĬlick on Tools > Audio Options and change your audio codec to the following settings:ĭisconnect your Bluetooth headset, reconnect it, and while some music is playing, inspect your codec. Search for additional tools and download Additional Tools for XCode 11.dmg You'll need to download Apple's Bluetooth Explorer in order to change codecs. UPDATE: It looks like Apple has silently dropped support for aptX, leaving only AAC If you're using AAC or aptX, you can stop here-those are the highest quality codecs.Option (⌥) click the Bluetooth button at the top of your screen.This results in a drastic degradation of sound, the SBC codec is the likely culprit, read more about it here. If you're using a high-end bluetooth headset on your Macbook Pro it's likely your mac is using an audio codec which favors battery efficiency over high quality.
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