diff --git a/Source/Engine/Audio/XAudio2/AudioBackendXAudio2.cpp b/Source/Engine/Audio/XAudio2/AudioBackendXAudio2.cpp
index 53a7cc3ba..edced31a1 100644
--- a/Source/Engine/Audio/XAudio2/AudioBackendXAudio2.cpp
+++ b/Source/Engine/Audio/XAudio2/AudioBackendXAudio2.cpp
@@ -813,13 +813,11 @@ void AudioBackendXAudio2::Base_Update()
         }
         else
         {
+            // Stereo
             dsp.DopplerFactor = 1.0f;
-
-            // TODO: implement proper matrix setup to convert input channels into output mastering voice
-            // hardcoded case for mono audio -> stereo speakers
             Platform::MemoryClear(dsp.pMatrixCoefficients, sizeof(XAudio2::MatrixCoefficients));
-            dsp.pMatrixCoefficients[0] = 0.5f;
-            dsp.pMatrixCoefficients[1] = 0.5f;
+            dsp.pMatrixCoefficients[0] = 1.0f;
+            dsp.pMatrixCoefficients[3] = 1.0f;
         }
 
         const float frequencyRatio = dopplerFactor * source.Pitch * dsp.DopplerFactor;