blocks|key|5156094|text|进入声音设置，然后看看SHB4000正在使用什么。如果使用HSP/HFP，则改为A2DP。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5156095|📷|atomic|offset|length|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://i.stack.imgur.com/E7u8G.png|imageAlt^0|0|0|1|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@$E|Q|F|R|1|S]]|A|$]]]|G|$H|$5|I|J|K|A|$L|M|N|-4]]]]

Go into sound settings, then see what the SHB4000 is using. If it uses HSP/HFP change to A2DP.
<a href="https://i.stack.imgur.com/E7u8G.png" rel="noreferrer"><img src="https://i.stack.imgur.com/E7u8G.png" alt="screenshot" /></a>

blocks|key|5156207|text|以下是我在Debian+9(菜单不可能应用)上的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5156208|重要事项:在每次重新连接之前，您必须重新启动蓝牙！|5156209|来源：https://unix.stackexchange.com/a/415928/325467|offset|length|5156210|我正在使用Debian9中的SoundBuds曲线耳机，并且有同样的问题，我无法从HSP/HFP配置文件切换到A2DP配置文件。|5156211|为我解决这个问题的是编辑/etc/bluetooth/main.conf|style|CODE|5156212|sudo+nano+/etc/bluetooth/main.conf|code-block|syntax|javascript|5156213|首先，在一般信息标记下添加以下行(从audio.conf复制，我找到了搜索解决方案的方法)：|5156214|#+Automatically+connect+both+A2DP+and+HFP/HSP+profiles+for+incoming
#+connections.+Some+headsets+that+support+both+profiles+will+only+connect+the
#+other+one+automatically+so+the+default+setting+of+true+is+usually+a+good
#+idea.
AutoConnect=true|5156215|接下来，您必须启用对多个概要文件(下面几行)的支持，只需取消注释并将值设置为multiple|5156216|MultiProfile+=+multiple|5156217|然后重新启动蓝牙服务。|5156218|sudo+systemctl+restart+bluetooth+|5156219|entityMap|0|LINK|mutability|MUTABLE|url|https://unix.stackexchange.com/a/415928/325467^0|0|0|3|1A|0|0|0|C|O|0|0|0|0|12|8|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1E|8|@]|9|@$F|1F|G|1G|1|1H]]|A|$]]|$1|H|3|I|5|6|7|1I|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1J|8|@$F|1K|G|1L|L|M]]|9|@]|A|$]]|$1|N|3|O|5|P|7|1M|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|1N|8|@]|9|@]|A|$]]|$1|U|3|V|5|P|7|1O|8|@]|9|@]|A|$Q|R]]|$1|W|3|X|5|6|7|1P|8|@$F|1Q|G|1R|L|M]]|9|@]|A|$]]|$1|Y|3|Z|5|P|7|1S|8|@]|9|@]|A|$Q|R]]|$1|10|3|11|5|6|7|1T|8|@]|9|@]|A|$]]|$1|12|3|13|5|P|7|1U|8|@]|9|@]|A|$Q|R]]|$1|14|3|C|5|6|7|1V|8|@]|9|@]|A|$]]]|15|$16|$5|17|18|19|A|$1A|1B]]]]

Here is the solution that worked for me on Debian 9 (menu impossible to apply)

Important: you will have to restart bluetooth before each reconnection !

Source: <a href="https://unix.stackexchange.com/a/415928/325467">https://unix.stackexchange.com/a/415928/325467</a>

<hr>

I am using a SoundBuds Curve headset in Debian 9, 
and have had the same problem, I was
unable to switch from the HSP/HFP profile to the A2DP profile.

What fixed the issue for me, was editing <code>/etc/bluetooth/main.conf</code>

<pre><code>sudo nano /etc/bluetooth/main.conf
</code></pre>

First add the following lines under the [General] tag (copied from audio.conf, I found searching for a solution):

<pre><code># Automatically connect both A2DP and HFP/HSP profiles for incoming
# connections. Some headsets that support both profiles will only connect the
# other one automatically so the default setting of true is usually a good
# idea.
AutoConnect=true
</code></pre>

Next you must enable support for multiple profiles (a few lines below) just uncomment and set value to <code>multiple</code>

<pre><code>MultiProfile = multiple
</code></pre>

Then restart bluetooth service

<pre><code>sudo systemctl restart bluetooth 
</code></pre>

Important: you will have to restart bluetooth before each reconnection !

blocks|key|6199070|text|对于那些经历了Ubuntu16.04和切换到A2DP只工作一次的人，我不得不断开连接，忘记设备，重新连接，切换到A2DP，这样它才能重新开始工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|6199071|(想将此作为评论发布，但n00b-ness阻止了这一点)|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|F|8|@]|9|@]|A|$]]]|D|$]]

For those experiencing this with Ubuntu 16.04, and switching to A2DP only worked once, I had to disconnect, forget the device, reconnect, switch to A2DP, for it to start working again.

(Wanted to post this as a comment, but n00b-ness prevents this)

blocks|key|5156496|text|只适用于Ubuntu+20.04+(似乎在21.04中固定)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5156497|对于任何一个人来说，他们都会使用Ubuntu耳机的麦克风，抱怨声音和语音质量不好：|5156498|“玛伊2021”有一个新的更新：|5156499|通过这提交，HFP可以通过蓝牙支持宽带音频语音.我能够提高我的麦克风质量，我的同事们现在真的可以理解我了，我听起来不喜欢和一部旧电话说话。|offset|length|5156500|用索尼1000-mx3在Ubuntu+20.04上进行测试|5156501|为此，您需要通过以下方法从git存储库中克隆最新的脉冲音频母版：|5156502|git+clone+https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git|code-block|syntax|javascript|5156503|通过|header-two|5156504|编译和安装|5156505|meson+build
sudo+ninja+-C+build+install
sudo+ldconfig|5156506|取自脉冲音频的文档|5156507|您可能必须安装源代码依赖项才能使编译工作。为本goto开放软件-设置与software-properties-gtk和启用源代码。然后使用sudo+apt-get+build-dep+pulseaudio安装构建依赖项。|style|CODE|5156508|重新启动。然后，当您打开您的声音设置，您可以选择HFP-配置文件，这使更好的声音质量的VOIP。要获得最好的音乐质量，最好还是再次切换到A2DP，但是这个不支持麦克风的使用。|entityMap|0|LINK|mutability|MUTABLE|url|https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/507|1|https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/Developer/PulseAudioFromGit/^0|0|0|0|2|1|0|0|0|0|0|0|0|0|7|2|1|0|Z|N|1X|X|0^^$0|@$1|2|3|4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1H|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1I|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|1J|8|@]|9|@$H|1K|I|1L|1|1M]]|A|$]]|$1|J|3|K|5|6|7|1N|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1O|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1P|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|U|7|1Q|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1R|8|@]|9|@]|A|$]]|$1|X|3|Y|5|P|7|1S|8|@]|9|@]|A|$Q|R]]|$1|Z|3|10|5|6|7|1T|8|@]|9|@$H|1U|I|1V|1|1W]]|A|$]]|$1|11|3|12|5|6|7|1X|8|@$H|1Y|I|1Z|13|14]|$H|20|I|21|13|14]]|9|@]|A|$]]|$1|15|3|16|5|6|7|22|8|@]|9|@]|A|$]]]|17|$18|$5|19|1A|1B|A|$1C|1D]]|1E|$5|19|1A|1B|A|$1C|1F]]]]

For Ubuntu 20.04 only (seems to be fixed in 21.04)
For anyone, that uses the Microphone of their Headset with Ubuntu and complain about bad sound and speech quality:
There is a new update in Mai 2021:
With <a href="https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/507" rel="nofollow noreferrer">this</a> commit, HFP can be enabled which supports wideband audio-speech via bluetooth.
I was able to improve my microphone quality alot and my colleagues actually can understand me now and I dont sound like talking with an old phone.
Tested on Ubuntu 20.04 with Sony 1000-mx3
For this to work you need to clone the latest pulseaudio master from their git repository by:
<pre><code>git clone https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
</code></pre>
Compile and install via
<pre><code>meson build
sudo ninja -C build install
sudo ldconfig
</code></pre>
Taken from the <a href="https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/Developer/PulseAudioFromGit/" rel="nofollow noreferrer">docs</a> of pulseaudio
You might have to install source-dependencies for the compilation to work. For this goto open Software-Settings with <code>software-properties-gtk</code> and enable source. Then install the build-dependencies with <code>sudo apt-get build-dep pulseaudio</code>
Restart. Then, when you open your Sound-Settings you are able to choose the HFP-Profile, which enables much better sound-quality for VOIP. For best music-quality, still better switch to A2DP again, however, this one does not support microphone usage.

blocks|key|5156428|text|对我有效的解决方案是这里|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5156429|它基本上是说：|5156430|$sudo+apt+install+pulseaudio+pulseaudio-utils+pavucontrol+pulseaudio-module-bluetooth|code-block|syntax|javascript|5156431|然后添加：|5156432|[General]
Enable=Source,Sink,Media,Socket|5156433|到/etc/蓝牙/音频.并运行：|5156434|sudo+service+bluetooth+restart|5156435|然后重新连接你的耳机，它应该能工作。对我来说是这样！|entityMap|0|LINK|mutability|MUTABLE|url|https://tutorials.technology/tutorials/Bluetooth-headset-playing-low-quality-on-ubuntu-18.html^0|A|2|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]]|C|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|16|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|17|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|18|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|19|8|@]|9|@]|C|$]]|$1|Q|3|R|5|H|7|1A|8|@]|9|@]|C|$I|J]]|$1|S|3|T|5|6|7|1B|8|@]|9|@]|C|$]]]|U|$V|$5|W|X|Y|C|$Z|10]]]]

The solution which worked for me is
<a href="https://tutorials.technology/tutorials/Bluetooth-headset-playing-low-quality-on-ubuntu-18.html" rel="nofollow noreferrer">here</a>
basically it says to do:
<pre><code>$sudo apt install pulseaudio pulseaudio-utils pavucontrol pulseaudio-module-bluetooth
</code></pre>
then add:
<pre><code>[General]
Enable=Source,Sink,Media,Socket
</code></pre>
to /etc/bluetooth/audio.conf and run:
<pre><code>sudo service bluetooth restart
</code></pre>
Then reconnect your headphones and it should work. It did for me!

blocks|key|5156265|text|我必须同时将main.conf设置为多个配置文件，然后移除耳机并将其添加回原来的位置，然后将它们默认为“高可靠性”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

I had to do both setting the main.conf to multiple profiles then remove the headphones and add them back and then they defaulted to High Fidelity.

blocks|key|5156337|text|也许有人会发现这很有帮助:当某个应用在播放声音时，不要尝试切换到A2DP。您需要先禁用所有声音输出，然后断开、连接、切换到A2DP，然后选择A2DP设备作为目标。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

May be someone will find this helpful: Don't try to switch to A2DP while some app is playing sound. You need to disable all sound outputs first, then disconnect, connect, switch to A2DP, then select A2DP device as target.

blocks|key|6199365|text|所以，我最近买了JBL+700+JBL耳机。在与Ubuntu20.04连接时，我的声音很低沉。我做了些什么来修复它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|6199366|1>+sudo+apt+install+pulseaudio+pulseaudio-utils+pavucontrol+pulseaudio-module-bluetooth|offset|length|style|CODE|6199367|结果发现我并没有全部拥有。|6199368|2>Then编辑/etc/蓝牙/main.conf|6199369|然后将MultiProfile更改为倍数，|6199370|MultiProfile+=倍数|6199371|3>+sudo+systemctl+restart+bluetooth|6199372|这个帮我修好了。希望有人发现这有帮助。|entityMap^0|0|3|2C|0|0|0|0|0|3|W|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Z|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|10|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|11|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|R|3|S|5|6|7|15|8|@]|9|@]|A|$]]]|T|$]]

So, I recently bought the JBL 700BT Headphones. I was getting muffled voice upon connecting with Ubuntu 20.04. Here's what I did to fix it:
1&gt; <code>sudo apt install pulseaudio pulseaudio-utils pavucontrol pulseaudio-module-bluetooth</code>
It turns out I didn't have all of them.
2&gt;Then edit the /etc/bluetooth/main.conf
Change MultiProfile to multiple then,
MultiProfile = multiple
3&gt; <code>sudo systemctl restart bluetooth</code>
This fixed it for me. Hoping someone finds this helpful.

blocks|key|6199434|text|我也有同样的问题，使用Ubuntu+22.04.1+LTS|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|6199435|6199436|每当我接通我的无线耳机，我就会听到一种静态扭曲的声音。|6199437|所以我安装了PulseAudio|6199438|sudo+apt+install+pavucontrol|6199439|打开它并更改我连接的设备的代码|6199440|📷|atomic|6199441|这看起来很管用！|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://i.stack.imgur.com/nbUlv.png|imageAlt^0|B|I|0|0|0|0|0|S|0|0|0|1|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|14|8|@]|D|@]|E|$]]|$1|G|3|H|5|6|7|15|8|@]|D|@]|E|$]]|$1|I|3|J|5|6|7|16|8|@]|D|@]|E|$]]|$1|K|3|L|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1A|8|@]|D|@]|E|$]]|$1|O|3|P|5|Q|7|1B|8|@]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|R|3|S|5|6|7|1F|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z|10|-4]]]]

I had the same issue, using <code>Ubuntu 22.04.1 LTS</code> 
Whenever I connected my wireless earbuds I got static distorted sound
so I installed PulseAudio
<code>sudo apt install pavucontrol</code>
opened it and changed the Codec of my connected device
<a href="https://i.stack.imgur.com/nbUlv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nbUlv.png" alt="enter image description here" /></a>
that seemed to do the trick!

blocks|key|5156323|text|我正在运行Ubuntu16.04，并且我的JBL+E65BTNC耳机也遇到了同样的问题，在这里，切换到A2DP并不适用。我使用了@56ka的大部分答案，但我不需要你需要设置的部分：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5156324|MultiProfile+=+multiple|code-block|syntax|javascript|5156325|事实上，当我这样做的时候，A2DP和HSP/HFP都是不可用的。该设备被列为输出设备，但声音没有发出(也就是说，当我试图在“声音设置”中测试该设备时，什么都没有发生)。当我将MultiProfile选项注释掉并重新启动蓝牙服务时，一切正常。|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|K|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|L|8|@]|9|@]|A|$]]]|I|$]]

I am running Ubuntu 16.04 and experienced the same problem with my JBL E65BTNC headphones where changing to A2DP didn't stick. I used most of @56ka's answer but I didn't need the part where you need to set:

<pre><code>MultiProfile = multiple
</code></pre>

In fact, when I did this, neither A2DP nor HSP/HFP was available. The device was listed as an output device but the sound did not come through (i.e. when I tried to test the device in Sound Settings, nothing happened). When I commented the MultiProfile option out and restarted the bluetooth service, everything worked.

blocks|key|6199310|text|它应该在不影响系统配置的情况下工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|6199311|由于某些原因，您的设备可能被用作耳机单元。|6199312|若要切换到“高可靠性”，请安装pavucontrol+(如果尚未安装)。|offset|length|style|CODE|6199313|sudo+apt+install+pavucontrol|code-block|syntax|javascript|6199314|连接你的蓝牙设备。|6199315|转到pavucontrol，configuration选项卡，在那里您可以为输出设备选择配置文件，选择AD2P|6199316|高可靠性回放(AD2P+Sink)|unordered-list-item|6199317|耳机头单元(HSP/HFP)|entityMap^0|0|0|F|B|0|0|0|2|B|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|10|8|@$F|11|G|12|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|13|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|14|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|15|8|@$F|16|G|17|H|I]]|9|@]|A|$]]|$1|S|3|T|5|U|7|18|8|@]|9|@]|A|$]]|$1|V|3|W|5|U|7|19|8|@]|9|@]|A|$]]]|X|$]]

It should works without messing with the system configuration.
Your device is likely taken as a headset unit for some reasons.
To switch to High Fidelity, install <code>pavucontrol</code> if not done already.
<pre><code>sudo apt install pavucontrol
</code></pre>
Connect your bluetooth device.
Go to <code>pavucontrol</code>, «configuration» tab, where you can select a profile for your output device, choose AD2P
<ul>
<li>High Fidelity Playback (AD2P Sink)</li>
<li>Headset Head Unit (HSP/HFP)</li>
</ul>

blocks|key|6199384|text|需要检查的是，我在声音设置中启用了过度放大功能，这极大地影响了声音质量.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

Something to check, I had Over-Amplification enabled in the sound settings which drastically affected the sound quality.

blocks|key|5156668|text|由于名誉原因，我不能对答案发表评论，但我想扩展一下@MichaelJanz的答案，因为它为我指明了正确的方向，但我不得不采取一些额外的步骤，这可能会节省一些时间，以下是我所做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5156669|git+clone+https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
cd+pulseaudio
sudo+apt-get+install+python3+python3-pip+python3-setuptools+python3-wheel+ninja-build+doxygen
sudo+pip3+install+meson
software-properties-gtk+#+<when+window+opens,+tick+the+checkbox+next+to+'Source+code'>
sudo apt-get build-dep pulseaudio
meson+build
ninja+-C+build
sudo+ninja+-C+build+install
sudo+ldconfig|code-block|syntax|javascript|5156670|重新启动你的电脑，你应该能够为你的耳机选择一个新的模式在声音设置，该模式被称为'HPF‘。|5156671|同样，如果你已经使用了Ubuntu+21，你就不需要新的脉冲音频了，但是这应该会帮助那些还在20岁的人(不确定更老的版本)。|5156672|如果你想听一些音乐，你总是可以切换到A2DP的设置(麦克风是禁用的，但声音更好)，并切换回HFP，当你想使用麦克风。|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|O|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|P|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Q|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|R|8|@]|9|@]|A|$]]]|M|$]]

I can't comment on answers because of reputation but I wanted to expand on @MichaelJanz's answer since it pointed me in the right direction but I had to do some extra steps and it might save someone a bit of time, here's what I did:
<pre><code>git clone https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
cd pulseaudio
sudo apt-get install python3 python3-pip python3-setuptools python3-wheel ninja-build doxygen
sudo pip3 install meson
software-properties-gtk # &lt;when window opens, tick the checkbox next to 'Source code'&gt;
sudo apt-get build-dep pulseaudio
meson build
ninja -C build
sudo ninja -C build install
sudo ldconfig
</code></pre>
Restart your PC and you should be able to select a new mode for you headset in sound settings, the mode is called 'HPF'.
Again, you don't need the new pulseaudio if you're already on Ubuntu 21 but this should help people who are still on 20 (not sure about older versions).
If you want to listen to some music, you can always switch to A2DP in the settings (where mic is disabled but sound is better still) and switch back to HFP when you want to use the mic.

I've bought a Philips SHB4000 headset (phone+mic) wireless (bluetooth) and It has a good quality when I pair it with my phone or PC Windows but when I pair it with the same PC on Ubuntu (14.10 64 bits) the sound quality goes down.

I've been googling about but I haven't found any convincing answer.

Tks in advance!
....

Bluetooth headset with poor sound quality on Ubuntu

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我买了飞利浦SHB4000耳机(phone+mic)无线(蓝牙)，当我把它和我的手机或PC Windows配对时，它有很好的质量，但是当我把它和Ubuntu上的同一台PC (14.10位)配对时，音质就会下降。我一直在谷歌搜索，但我没有找到任何令人信服的答案。提前准备！.

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