diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4cf2163..2256de7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,8 @@
   - "advanced audio" features (NightMode, Bassmode, VoiceEnhancer)
   - "woofer" feature
   - "soundmode" feature
+  - "speaker_level"
+  - "rear_speaker_mode"
 
 ### Changed
 
diff --git a/custom_components/samsung_soundbar/api_extension/SoundbarDevice.py b/custom_components/samsung_soundbar/api_extension/SoundbarDevice.py
index b32c41b..f89e844 100644
--- a/custom_components/samsung_soundbar/api_extension/SoundbarDevice.py
+++ b/custom_components/samsung_soundbar/api_extension/SoundbarDevice.py
@@ -2,11 +2,11 @@ import asyncio
 import datetime
 import json
 import logging
-import time
 from urllib.parse import quote
 
 from pysmartthings import DeviceEntity
 
+from .const import SpeakerIdentifier, RearSpeakerMode
 from ..const import DOMAIN
 
 log = logging.getLogger(__name__)
@@ -404,6 +404,22 @@ class SoundbarDevice:
     def media_coverart_updated(self) -> datetime.datetime:
         return self.__media_cover_url_update_time
 
+    # ------------ Speaker Level ----------------
+
+    async def set_speaker_level(self, speaker: SpeakerIdentifier, level: int):
+        await self.set_custom_execution_data(
+            href="/sec/networkaudio/channelVolume",
+            property="x.com.samsung.networkaudio.channelVolume",
+            value=[{"name": speaker.value, "value": level}],
+        )
+
+    async def set_rear_speaker_mode(self, mode: RearSpeakerMode):
+        await self.set_custom_execution_data(
+            href="/sec/networkaudio/surroundspeaker",
+            property="x.com.samsung.networkaudio.currentRearPosition",
+            value=mode.value,
+        )
+
     # ------------ SUPPORT FUNCTIONS ------------
 
     async def update_execution_data(self, argument: str):
@@ -412,7 +428,7 @@ class SoundbarDevice:
 
     async def set_custom_execution_data(self, href: str, property: str, value):
         argument = [href, {property: value}]
-        await self.device.command("main", "execute", "execute", argument)
+        assert await self.device.command("main", "execute", "execute", argument)
 
     async def get_execute_status(self):
         url = f"https://api.smartthings.com/v1/devices/{self._device_id}/components/main/capabilities/execute/status"
diff --git a/custom_components/samsung_soundbar/api_extension/const.py b/custom_components/samsung_soundbar/api_extension/const.py
new file mode 100644
index 0000000..b33692c
--- /dev/null
+++ b/custom_components/samsung_soundbar/api_extension/const.py
@@ -0,0 +1,15 @@
+from enum import Enum
+
+
+class SpeakerIdentifier(Enum):
+    CENTER = "Spk_Center"
+    SIDE = "Spk_Side"
+    WIDE = "Spk_Wide"
+    FRONT_TOP = "Spk_Front_Top"
+    REAR = "Spk_Rear"
+    REAR_TOP = "Spk_Rear_Top"
+
+
+class RearSpeakerMode(Enum):
+    FRONT = "Front"
+    REAR = "Rear"
diff --git a/custom_components/samsung_soundbar/media_player.py b/custom_components/samsung_soundbar/media_player.py
index 5f2388a..8cc76c7 100644
--- a/custom_components/samsung_soundbar/media_player.py
+++ b/custom_components/samsung_soundbar/media_player.py
@@ -11,8 +11,8 @@ from homeassistant.helpers.entity import DeviceInfo, generate_entity_id
 from homeassistant.helpers import config_validation as cv, entity_platform, selector
 import voluptuous as vol
 
-
 from .api_extension.SoundbarDevice import SoundbarDevice
+from .api_extension.const import SpeakerIdentifier, RearSpeakerMode
 from .const import (
     CONF_ENTRY_API_KEY,
     CONF_ENTRY_DEVICE_ID,
@@ -78,6 +78,20 @@ def addServices():
         SmartThingsSoundbarMediaPlayer.async_set_voice_mode.__name__,
     )
 
+    platform.async_register_entity_service(
+        "set_speaker_level",
+        cv.make_entity_service_schema(
+            {vol.Required("speaker_identifier"): str, vol.Required("level"): int}
+        ),
+        SmartThingsSoundbarMediaPlayer.async_set_speaker_level.__name__,
+    )
+
+    platform.async_register_entity_service(
+        "set_rear_speaker_mode",
+        cv.make_entity_service_schema({vol.Required("speaker_mode"): str}),
+        SmartThingsSoundbarMediaPlayer.async_set_rear_speaker_mode.__name__,
+    )
+
 
 async def async_setup_entry(hass, config_entry, async_add_entities):
     domain_data = hass.data[DOMAIN]
@@ -243,6 +257,16 @@ class SmartThingsSoundbarMediaPlayer(MediaPlayerEntity):
     async def async_set_night_mode(self, enabled: bool):
         await self.device.set_night_mode(enabled)
 
+    # ---------- SERVICE_UTILITY ------------
+
+    async def async_set_speaker_level(self, speaker_identifier: str, level: int):
+        await self.device.set_speaker_level(
+            SpeakerIdentifier(speaker_identifier), level
+        )
+
+    async def async_set_rear_speaker_mode(self, speaker_mode: str):
+        await self.device.set_rear_speaker_mode(RearSpeakerMode(speaker_mode))
+
     # This property can be uncommented for some extra_attributes
     # Still enabling this can cause side-effects.
     # @property
diff --git a/custom_components/samsung_soundbar/services.yaml b/custom_components/samsung_soundbar/services.yaml
index 718a66d..1284ec8 100644
--- a/custom_components/samsung_soundbar/services.yaml
+++ b/custom_components/samsung_soundbar/services.yaml
@@ -85,4 +85,53 @@ set_voice_enhancer:
       example: true
       default: false
       selector:
-        boolean:
\ No newline at end of file
+        boolean:
+
+set_speaker_level:
+  name: Set Speaker level
+  description: Set the speaker levels of your soundbar
+  target:
+    device:
+      integration: samsung_soundbar
+  fields:
+    speaker_identifier:
+      name: Speaker Identifier
+      required: true
+      example: Spk_Center
+      selector:
+        select:
+          translation_key: "speaker_identifier"
+          options:
+            - "Spk_Center"
+            - "Spk_Side"
+            - "Spk_Wide"
+            - "Spk_Front_Top"
+            - "Spk_Rear"
+            - "Spk_Rear_Top"
+    level:
+      name: Speaker Level
+      required: true
+      example: 0
+      selector:
+        number:
+          min: -6
+          max: 6
+          step: 1
+
+set_rear_speaker_mode:
+  name: Set rear speaker mode
+  description: Set the rear speaker mode of your soundbar
+  target:
+    device:
+      integration: samsung_soundbar
+  fields:
+    speaker_mode:
+      name: Speaker mode
+      required: true
+      example: Rear
+      selector:
+        select:
+          translation_key: "speaker_identifier"
+          options:
+            - "Rear"
+            - "Front" 
\ No newline at end of file