# Why Is Bluetooth Sound Quality Bad on My Mac - recadio.com Synced: [[2023_12_14]] 2:30 PM Last Highlighted: [[2023_12_14]] Tags: [[Explainer]] [[Software]]  I wonder if it just uses the Mac’s microphone instead of the headphones ## Highlights [[2023_12_14]] [View Highlight](https://read.readwise.io/read/01hhkwbnbtvz2t7v8zb04n771h) > The **A2DP** use case is to support high-quality audio distribution, so quality is obviously a priority. Communication only goes in one direction, therefore the sender can use the full connection to fit audio. Both compression and delay are not critical. As a result, A2DP uses codecs that produce high audio quality. > The **HFP** use case is handling phone calls, so audio quality is not very important, but latency is. Data travels both ways, each device taking turns sending their data. As a consequence bandwidth is halved, making compression important. Therefore, HFP uses codecs with low latency sacrificing audio quality