19.10 蓝牙扬声器通过 A2DP 非常安静

Question

我有一对连接到 MR230 蓝牙接收器适配器的扬声器。在Windows中设置没有问题，在Ubuntu 19.10中声音太小。我想说的是，当所有功能都调至最大 150% 且扬声器音量调至最大时，听起来像是 Windows 最大音量的 20-25%。扬声器通过 A2TP 接收器连接，我已更新所有内容，以下是相关配置：

> pacmd list-cards
...
* index: 7
name: <bluez_sink.E8_07_BF_08_2B_F5.a2dp_sink>
driver: <module-bluez5-device.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY FLAT_VOLUME 
state: RUNNING
suspend cause: (none)
priority: 9950
volume: front-left: 62257 /  95% / -1.34 dB,   front-right: 62257 /  95% / -1.34 dB
balance 0.00
base volume: 65536 / 100% / 0.00 dB
volume steps: 65537
muted: no
current latency: 66.56 ms
max request: 4 KiB
max rewind: 0 KiB
monitor source: 11
sample spec: s16le 2ch 48000Hz
channel map: front-left,front-right
Stereo
used by: 1
linked by: 1
fixed latency: 46.33 ms
card: 3 <bluez_card.E8_07_BF_08_2B_F5>
module: 26
properties:
bluetooth.protocol = "a2dp_sink"
device.description = "MR230"
device.string = "E8:07:BF:08:2B:F5"
device.api = "bluez"
device.class = "sound"
device.bus = "bluetooth"
device.form_factor = "headphone"
bluez.path = "/org/bluez/hci0/dev_E8_07_BF_08_2B_F5"
bluez.class = "0x240418"
bluez.alias = "MR230"
device.icon_name = "audio-headphones-bluetooth"
ports:
headphone-output: Headphone (priority 0, latency offset 0 usec, available: yes)
properties:
active port: <headphone-output>

当我使用pacmd set-sink-volume bluez_sink.E8_07_BF_08_2B_F5.a2dp_sink XXX它时改变音量，但仍然在 90000 左右，就像 150% 一样pavucontrol，声音也有点失真。

我尝试过在 中预增强声音mpv，但它会导致可怕的削波。通过 HFS，声音足够大，但听起来很可怕。

蓝牙由 Intel AX200 模块提供，并带有来自 Intel 站点的最新 iwlwifi 驱动程序和固件。

知道可能出什么问题吗？