diff --git a/homeassistant/components/sonos/number.py b/homeassistant/components/sonos/number.py
index 375ed58035b2..c74c5933ecf3 100644
--- a/homeassistant/components/sonos/number.py
+++ b/homeassistant/components/sonos/number.py
@@ -21,6 +21,7 @@ LEVEL_TYPES = {
     "bass": (-10, 10),
     "balance": (-100, 100),
     "treble": (-10, 10),
+    "sub_crossover": (50, 110),
     "sub_gain": (-15, 15),
     "surround_level": (-15, 15),
     "music_surround_level": (-15, 15),
diff --git a/homeassistant/components/sonos/speaker.py b/homeassistant/components/sonos/speaker.py
index b73ca6a77e4d..fea5b5de7deb 100644
--- a/homeassistant/components/sonos/speaker.py
+++ b/homeassistant/components/sonos/speaker.py
@@ -154,6 +154,7 @@ class SonosSpeaker:
         self.dialog_level: bool | None = None
         self.night_mode: bool | None = None
         self.sub_enabled: bool | None = None
+        self.sub_crossover: int | None = None
         self.sub_gain: int | None = None
         self.surround_enabled: bool | None = None
         self.surround_mode: bool | None = None
@@ -561,6 +562,7 @@ class SonosSpeaker:
             "audio_delay",
             "bass",
             "treble",
+            "sub_crossover",
             "sub_gain",
             "surround_level",
             "music_surround_level",
diff --git a/homeassistant/components/sonos/strings.json b/homeassistant/components/sonos/strings.json
index fb10167f1d0b..6f45195c46be 100644
--- a/homeassistant/components/sonos/strings.json
+++ b/homeassistant/components/sonos/strings.json
@@ -36,6 +36,9 @@
       "treble": {
         "name": "Treble"
       },
+      "sub_crossover": {
+        "name": "Sub crossover frequency"
+      },
       "sub_gain": {
         "name": "Sub gain"
       },
diff --git a/tests/components/sonos/conftest.py b/tests/components/sonos/conftest.py
index 648ca12803cf..8bd8224e7260 100644
--- a/tests/components/sonos/conftest.py
+++ b/tests/components/sonos/conftest.py
@@ -108,8 +108,26 @@ def config_entry_fixture():
 class MockSoCo(MagicMock):
     """Mock the Soco Object."""
 
+    uid = "RINCON_test"
+    play_mode = "NORMAL"
+    mute = False
+    night_mode = True
+    dialog_level = True
+    loudness = True
+    volume = 19
     audio_delay = 2
+    balance = (61, 100)
+    bass = 1
+    treble = -1
+    mic_enabled = False
+    sub_crossover = None  # Default to None for non-Amp devices
+    sub_enabled = False
     sub_gain = 5
+    surround_enabled = True
+    surround_mode = True
+    surround_level = 3
+    music_surround_level = 4
+    soundbar_audio_input_format = "Dolby 5.1"
 
     @property
     def visible_zones(self):
@@ -143,10 +161,7 @@ class SoCoMockFactory:
         mock_soco.mock_add_spec(SoCo)
         mock_soco.ip_address = ip_address
         if ip_address != "192.168.42.2":
-            mock_soco.uid = f"RINCON_test_{ip_address}"
-        else:
-            mock_soco.uid = "RINCON_test"
-        mock_soco.play_mode = "NORMAL"
+            mock_soco.uid += f"_{ip_address}"
         mock_soco.music_library = self.music_library
         mock_soco.get_current_track_info.return_value = self.current_track_info
         mock_soco.music_source_from_uri = SoCo.music_source_from_uri
@@ -161,23 +176,6 @@ class SoCoMockFactory:
         mock_soco.contentDirectory = SonosMockService("ContentDirectory", ip_address)
         mock_soco.deviceProperties = SonosMockService("DeviceProperties", ip_address)
         mock_soco.alarmClock = self.alarm_clock
-        mock_soco.mute = False
-        mock_soco.night_mode = True
-        mock_soco.dialog_level = True
-        mock_soco.loudness = True
-        mock_soco.volume = 19
-        mock_soco.audio_delay = 2
-        mock_soco.balance = (61, 100)
-        mock_soco.bass = 1
-        mock_soco.treble = -1
-        mock_soco.mic_enabled = False
-        mock_soco.sub_enabled = False
-        mock_soco.sub_gain = 5
-        mock_soco.surround_enabled = True
-        mock_soco.surround_mode = True
-        mock_soco.surround_level = 3
-        mock_soco.music_surround_level = 4
-        mock_soco.soundbar_audio_input_format = "Dolby 5.1"
         mock_soco.get_battery_info.return_value = self.battery_info
         mock_soco.all_zones = {mock_soco}
         mock_soco.group.coordinator = mock_soco
diff --git a/tests/components/sonos/test_number.py b/tests/components/sonos/test_number.py
index 38456058d8a1..d58b84ab6cb0 100644
--- a/tests/components/sonos/test_number.py
+++ b/tests/components/sonos/test_number.py
@@ -6,6 +6,8 @@ from homeassistant.const import ATTR_ENTITY_ID
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import entity_registry as er
 
+CROSSOVER_ENTITY = "number.zone_a_sub_crossover_frequency"
+
 
 async def test_number_entities(
     hass: HomeAssistant, async_autosetup_sonos, soco, entity_registry: er.EntityRegistry
@@ -62,3 +64,32 @@ async def test_number_entities(
             blocking=True,
         )
         mock_sub_gain.assert_called_once_with(-8)
+
+    # sub_crossover is only available on Sonos Amp devices, see test_amp_number_entities
+    assert CROSSOVER_ENTITY not in entity_registry.entities
+
+
+async def test_amp_number_entities(
+    hass: HomeAssistant, async_setup_sonos, soco, entity_registry: er.EntityRegistry
+) -> None:
+    """Test the sub_crossover feature only available on Sonos Amp devices.
+
+    The sub_crossover value will be None on all other device types.
+    """
+    with patch.object(soco, "sub_crossover", 50):
+        await async_setup_sonos()
+
+    sub_crossover_number = entity_registry.entities[CROSSOVER_ENTITY]
+    sub_crossover_state = hass.states.get(sub_crossover_number.entity_id)
+    assert sub_crossover_state.state == "50"
+
+    with patch.object(
+        type(soco), "sub_crossover", new_callable=PropertyMock
+    ) as mock_sub_crossover:
+        await hass.services.async_call(
+            NUMBER_DOMAIN,
+            SERVICE_SET_VALUE,
+            {ATTR_ENTITY_ID: sub_crossover_number.entity_id, "value": 110},
+            blocking=True,
+        )
+        mock_sub_crossover.assert_called_once_with(110)