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I use my MacBook Pro from 2017 sometimes with bluetooth headphones on my desk with a distance of approximately 40cm between me and the MacBook.

The Problem is that sometimes the retransmission rate is very high (similar to package loss) which causes that the bluetooth stream of the headphones stagnates.

macOS Bluetooth Explorer with high retransmission rate

Using the same headphones with my other iDevices is no problem so I think it is the mac's fault.

Additionally I do not use any other bluetooth devices with my Mac and with a external bluetooth adapter the retransmission rate is 0%.

macOS Bluetooth Explorer with no retransmission rate

2 Answers 2

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Super graphs and presentation of this item - you are correct to be concerned if you are getting the feeling that efficiency is low right where the Mac is.

Couple things to help set conditions. You will want to track what exactly is plugged in physically to the mac. Everything from which cable - which port - as you make screen shots of times with high retransmission, you will know how often that happens and if it’s only when one cable or one device is attached. (And you will have to detach devices - split-half troubleshooting if needed or one by one)

Make note of devices that generate interference even when they are properly working:

Hopefully you don’t need to capture the Bluetooth traffic to understand the spikes and cause of retransmission - there are devices that can do this but it’s kind of technical and the good tools cost money and time to learn. If the only problem is the Mac, that’s a good reason to think it’s part of the issue either causing interference or more sensitive to the interference than your same iOS devices and headset.

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It also may help to adjust the codec used to connect to your device.

As you can see in the bottom of the graph "Active Audio Codec"

On mac the default codec is sbc or aac which has more latency and higher retransmission rates.

https://9to5mac.com/2018/08/31/mac-how-to-force-aptx-aac-on-your-supported-bluetooth-headphones/

hope this helps

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