diff --git a/app_new.py b/app_new.py
index 7f6d3b5..e1fc87d 100644
--- a/app_new.py
+++ b/app_new.py
@@ -1,10 +1,26 @@
 import sys
+
+from PySide6.QtCore import QSettings
 from PySide6.QtWidgets import QApplication
+
+import build_info
+from audio.system_volume import set_volume
 from ui.main_window_new import MainWindowNew
 
 
 def run_app_new():
     app = QApplication(sys.argv)
+    _apply_startup_volume()
     window = MainWindowNew(app)
     window.show()
     sys.exit(app.exec())
+
+
+def _apply_startup_volume():
+    settings = QSettings("car_ui", "ui")
+    raw = settings.value("sound/base_volume", build_info.DEFAULT_SOUND_VOLUME)
+    try:
+        value = int(raw)
+    except (TypeError, ValueError):
+        value = build_info.DEFAULT_SOUND_VOLUME
+    set_volume(value)
diff --git a/audio/__init__.py b/audio/__init__.py
new file mode 100644
index 0000000..a179b16
--- /dev/null
+++ b/audio/__init__.py
@@ -0,0 +1 @@
+"""Audio helpers."""
diff --git a/audio/system_volume.py b/audio/system_volume.py
new file mode 100644
index 0000000..9acbe4a
--- /dev/null
+++ b/audio/system_volume.py
@@ -0,0 +1,24 @@
+import shutil
+import subprocess
+
+
+def set_volume(value: int):
+    value = max(0, min(100, value))
+    if shutil.which("wpctl"):
+        _run_cmd(["wpctl", "set-volume", "@DEFAULT_AUDIO_SINK@", f"{value}%"])
+        return
+    if shutil.which("amixer"):
+        _run_cmd(["amixer", "sset", "PCM", f"{value}%"])
+
+
+def _run_cmd(args: list[str]):
+    try:
+        subprocess.run(
+            args,
+            capture_output=True,
+            text=True,
+            timeout=1,
+            check=False,
+        )
+    except (OSError, subprocess.SubprocessError):
+        pass
diff --git a/build_info.py b/build_info.py
index 761fedd..7705b90 100644
--- a/build_info.py
+++ b/build_info.py
@@ -9,6 +9,7 @@ VERSION = "0.1.0-dev"
 BUILD_DATE = "dev"
 GIT_HASH = "dev"
 DEVICE_MODEL = "Raspberry Pi"
+DEFAULT_SOUND_VOLUME = 100
 
 
 def get_device_model() -> str:
diff --git a/screens/setting/sound_screen.py b/screens/setting/sound_screen.py
index f8fb7f3..d5d9e13 100644
--- a/screens/setting/sound_screen.py
+++ b/screens/setting/sound_screen.py
@@ -1,4 +1,4 @@
-from PySide6.QtCore import Qt, QSettings
+from PySide6.QtCore import Qt, QSettings, QTimer
 from PySide6.QtGui import QFont
 from PySide6.QtWidgets import (
     QWidget,
@@ -11,6 +11,8 @@ from PySide6.QtWidgets import (
     QScrollArea,
     QScroller,
 )
+from audio.system_volume import set_volume
+import build_info
 
 
 class SoundScreen(QWidget):
@@ -18,6 +20,10 @@ class SoundScreen(QWidget):
         super().__init__()
         self._on_eq = on_eq
         self._settings = QSettings("car_ui", "ui")
+        self._pending_volume: int | None = None
+        self._volume_apply_timer = QTimer(self)
+        self._volume_apply_timer.setSingleShot(True)
+        self._volume_apply_timer.timeout.connect(self._flush_volume)
 
         root = QVBoxLayout(self)
         root.setContentsMargins(0, 0, 0, 0)
@@ -57,9 +63,21 @@ class SoundScreen(QWidget):
     def _read_bool(self, key: str, default: bool) -> bool:
         return _read_bool_setting(self._settings, key, default)
 
+    def _queue_volume_apply(self, value: int):
+        self._pending_volume = value
+        self._volume_apply_timer.start(120)
+
+    def _flush_volume(self):
+        if self._pending_volume is None:
+            return
+        self._set_system_volume(self._pending_volume)
+
+    def _set_system_volume(self, value: int):
+        set_volume(value)
+
     def _build_volume_card(self) -> QWidget:
         card, body = _card("Громкость")
-        default_value = 60
+        default_value = build_info.DEFAULT_SOUND_VOLUME
         value = self._read_int("sound/base_volume", default_value)
         row, slider, value_label = _slider_row(
             "Базовая громкость",
@@ -71,6 +89,7 @@ class SoundScreen(QWidget):
         slider.valueChanged.connect(
             lambda v: self._settings.setValue("sound/base_volume", v)
         )
+        slider.valueChanged.connect(self._queue_volume_apply)
         body.addWidget(row)
         return card