[Moto E4 Plus Questions & Answers] ROGGGER3G:
you don't understand.

I don't talk about bass.

Volume level on android 7, set the bluetooth devices to medium. Only at third volume step is possible hear any sound at speaker. In marshmallow moto x from my friends, same speaker sounds great.

Some dev could help us, and edit the audio policys to solve this.

Check this lines:

<?xml version="1.0" encoding="UTF-8"?>

<!-- Copyright (C) 2015 The Android Open Source Project

Licensed under the Apache License, Version 2.0 (the "License");

you may not use this file except in compliance with the License.

You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.

-->

<!-- Volume section defines a volume curve for a given use case and device category.

It contains a list of points of this curve expressing the attenuation in Millibels for a given

volume index from 0 to 100.

<volume stream=”AUDIO_STREAM_MUSIC” deviceCategory=””>

<point>0,-9600</point>

<point>100,0</point>

</volume>

-->

<volumes>

<volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_HEADSET">

<point>0,-4200</point>

<point>33,-2800</point>

<point>66,-1400</point>

<point>100,0</point>

</volume>

<volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_SPEAKER">

<point>0,-2400</point>

<point>33,-1600</point>

<point>66,-800</point>

<point>100,0</point>

</volume>

<volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_EARPIECE">

<point>0,-2400</point>

<point>33,-1600</point>

<point>66,-800</point>

<point>100,0</point>

</volume>

<volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="DEFAULT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_SYSTEM" deviceCategory="DEVICE_CATEGORY_HEADSET">

<point>1,-3000</point>

<point>33,-2600</point>

<point>66,-2200</point>

<point>100,-1800</point>

</volume>

<volume stream="AUDIO_STREAM_SYSTEM" deviceCategory="DEVICE_CATEGORY_SPEAKER"

ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_SYSTEM" deviceCategory="DEVICE_CATEGORY_EARPIECE"

ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_SYSTEM" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_RING" deviceCategory="DEVICE_CATEGORY_HEADSET"

ref="DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_RING" deviceCategory="DEVICE_CATEGORY_SPEAKER">

<point>1,-2970</point>

<point>33,-2010</point>

<point>66,-1020</point>

<point>100,0</point>

</volume>

<volume stream="AUDIO_STREAM_RING" deviceCategory="DEVICE_CATEGORY_EARPIECE"

ref="DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_RING" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_MUSIC" deviceCategory="DEVICE_CATEGORY_HEADSET"

ref="DEFAULT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_MUSIC" deviceCategory="DEVICE_CATEGORY_SPEAKER"

ref="DEFAULT_DEVICE_CATEGORY_SPEAKER_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_MUSIC" deviceCategory="DEVICE_CATEGORY_EARPIECE"

ref="DEFAULT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_MUSIC" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="DEFAULT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_ALARM" deviceCategory="DEVICE_CATEGORY_HEADSET"

ref="DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_ALARM" deviceCategory="DEVICE_CATEGORY_SPEAKER">

<point>1,-2970</point>

<point>33,-2010</point>

<point>66,-1020</point>

<point>100,0</point>

</volume>

<volume stream="AUDIO_STREAM_ALARM" deviceCategory="DEVICE_CATEGORY_EARPIECE"

ref="DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_ALARM" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_NOTIFICATION" deviceCategory="DEVICE_CATEGORY_HEADSET"

ref="DEFAULT_DEVICE_CATEGORY_HEADSET_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_NOTIFICATION" deviceCategory="DEVICE_CATEGORY_SPEAKER">

<point>1,-2970</point>

<point>33,-2010</point>

<point>66,-1020</point>

<point>100,0</point>

</volume>

<volume stream="AUDIO_STREAM_NOTIFICATION" deviceCategory="DEVICE_CATEGORY_EARPIECE"

ref="DEFAULT_DEVICE_CATEGORY_EARPIECE_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_NOTIFICATION" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_BLUETOOTH_SCO" deviceCategory="DEVICE_CATEGORY_HEADSET">

<point>0,-4200</point>

<point>33,-2800</point>

<point>66,-1400</point>

<point>100,0</point>

</volume>

<volume stream="AUDIO_STREAM_BLUETOOTH_SCO" deviceCategory="DEVICE_CATEGORY_SPEAKER">

<point>0,-2400</point>

<point>33,-1600</point>

<point>66,-800</point>

<point>100,0</point>

</volume>

<volume stream="AUDIO_STREAM_BLUETOOTH_SCO" deviceCategory="DEVICE_CATEGORY_EARPIECE">

<point>0,-4200</point>

<point>33,-2800</point>

<point>66,-1400</point>

<point>100,0</point>

</volume>

<volume stream="AUDIO_STREAM_BLUETOOTH_SCO" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="DEFAULT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_ENFORCED_AUDIBLE" deviceCategory="DEVICE_CATEGORY_HEADSET">

<point>1,-3000</point>

<point>33,-2600</point>

<point>66,-2200</point>

<point>100,-1800</point>

</volume>

<volume stream="AUDIO_STREAM_ENFORCED_AUDIBLE" deviceCategory="DEVICE_CATEGORY_SPEAKER"

ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_ENFORCED_AUDIBLE" deviceCategory="DEVICE_CATEGORY_EARPIECE"

ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_ENFORCED_AUDIBLE" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_DTMF" deviceCategory="DEVICE_CATEGORY_HEADSET">

<point>1,-3000</point>

<point>33,-2600</point>

<point>66,-2200</point>

<point>100,-1800</point>

</volume>

<volume stream="AUDIO_STREAM_DTMF" deviceCategory="DEVICE_CATEGORY_SPEAKER"

ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_DTMF" deviceCategory="DEVICE_CATEGORY_EARPIECE"

ref="DEFAULT_SYSTEM_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_DTMF" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="DEFAULT_DEVICE_CATEGORY_EXT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_TTS" deviceCategory="DEVICE_CATEGORY_HEADSET"

ref="SILENT_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_TTS" deviceCategory="DEVICE_CATEGORY_SPEAKER"

ref="FULL_SCALE_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_TTS" deviceCategory="DEVICE_CATEGORY_EARPIECE"

ref="SILENT_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_TTS" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="SILENT_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_ACCESSIBILITY" deviceCategory="DEVICE_CATEGORY_HEADSET"

ref="DEFAULT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_ACCESSIBILITY" deviceCategory="DEVICE_CATEGORY_SPEAKER"

ref="DEFAULT_DEVICE_CATEGORY_SPEAKER_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_ACCESSIBILITY" deviceCategory="DEVICE_CATEGORY_EARPIECE"

ref="DEFAULT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_ACCESSIBILITY" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="DEFAULT_MEDIA_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_REROUTING" deviceCategory="DEVICE_CATEGORY_HEADSET"

ref="FULL_SCALE_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_REROUTING" deviceCategory="DEVICE_CATEGORY_SPEAKER"

ref="FULL_SCALE_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_REROUTING" deviceCategory="DEVICE_CATEGORY_EARPIECE"

ref="FULL_SCALE_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_REROUTING" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="FULL_SCALE_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_PATCH" deviceCategory="DEVICE_CATEGORY_HEADSET"

ref="FULL_SCALE_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_PATCH" deviceCategory="DEVICE_CATEGORY_SPEAKER"

ref="FULL_SCALE_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_PATCH" deviceCategory="DEVICE_CATEGORY_EARPIECE"

ref="FULL_SCALE_VOLUME_CURVE"/>

<volume stream="AUDIO_STREAM_PATCH" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"

ref="FULL_SCALE_VOLUME_CURVE"/>

</volumes>