diff --git a/homeassistant/components/songpal/media_player.py b/homeassistant/components/songpal/media_player.py
index 3777ecd8325..578cdaed367 100644
--- a/homeassistant/components/songpal/media_player.py
+++ b/homeassistant/components/songpal/media_player.py
@@ -316,11 +316,11 @@ class SongpalEntity(MediaPlayerEntity):
 
     async def async_volume_up(self):
         """Set volume up."""
-        return await self._volume_control.set_volume("+1")
+        return await self._volume_control.set_volume(self._volume + 1)
 
     async def async_volume_down(self):
         """Set volume down."""
-        return await self._volume_control.set_volume("-1")
+        return await self._volume_control.set_volume(self._volume - 1)
 
     async def async_turn_on(self):
         """Turn the device on."""
diff --git a/tests/components/songpal/test_media_player.py b/tests/components/songpal/test_media_player.py
index 5a7ccfd846d..e4d03d03b0a 100644
--- a/tests/components/songpal/test_media_player.py
+++ b/tests/components/songpal/test_media_player.py
@@ -156,9 +156,7 @@ async def test_services(hass):
     await _call(media_player.SERVICE_VOLUME_UP)
     await _call(media_player.SERVICE_VOLUME_DOWN)
     assert mocked_device.volume1.set_volume.call_count == 3
-    mocked_device.volume1.set_volume.assert_has_calls(
-        [call(60), call("+1"), call("-1")]
-    )
+    mocked_device.volume1.set_volume.assert_has_calls([call(60), call(51), call(49)])
 
     await _call(media_player.SERVICE_VOLUME_MUTE, is_volume_muted=True)
     mocked_device.volume1.set_mute.assert_called_once_with(True)