diff --git a/src/ansys/sound/core/sound_composer/source_broadband_noise.py b/src/ansys/sound/core/sound_composer/source_broadband_noise.py
index 86cd52159..1303fcd39 100644
--- a/src/ansys/sound/core/sound_composer/source_broadband_noise.py
+++ b/src/ansys/sound/core/sound_composer/source_broadband_noise.py
@@ -141,7 +141,7 @@ def source_bbn(self) -> FieldsContainer:
         """Broadband noise source data, as a DPF fields container.
 
         The broadband noise source data consists of a series of spectra, each corresponding to a
-        control parameter value. Spectra can be narrowband, PSD, octave-band levels, or
+        control parameter value. Spectra can be narrowband (in dB or dB/Hz), octave-band levels, or
         1/3-octave-band levels.
         """
         return self.__source_bbn
@@ -170,10 +170,10 @@ def source_bbn(self, source_bbn: FieldsContainer):
             support_data = source_bbn.get_support("control_parameter_1")
             support_properties = support_data.available_field_supported_properties()
             support_values = support_data.field_support_by_property(support_properties[0])
-            if len(support_values) < 1:
+            if len(support_values) != len(source_bbn):
                 raise PyAnsysSoundException(
-                    "Control data in the specified broadband noise source must contain at least "
-                    "one element."
+                    "Broadband noise source must contain the same number of spectra and "
+                    "associated control parameter values."
                 )
 
         self.__source_bbn = source_bbn
diff --git a/tests/tests_sound_composer/test_sound_composer_source_broadband_noise.py b/tests/tests_sound_composer/test_sound_composer_source_broadband_noise.py
index 013f6b3ec..c4f0a0eec 100644
--- a/tests/tests_sound_composer/test_sound_composer_source_broadband_noise.py
+++ b/tests/tests_sound_composer/test_sound_composer_source_broadband_noise.py
@@ -186,8 +186,8 @@ def test_source_broadband_noise_properties_exceptions(dpf_sound_test_server):
     with pytest.raises(
         PyAnsysSoundException,
         match=(
-            "Control data in the specified broadband noise source must contain at least one "
-            "element."
+            "Broadband noise source must contain the same number of spectra and associated "
+            "control parameter values."
         ),
     ):
         source_bbn_obj.source_bbn = fc_source_bbn