diff -r 5dc02b23752f -r 3e2da88830cd src/multimedia/audio/qaudiodeviceinfo_win32_p.cpp
--- a/src/multimedia/audio/qaudiodeviceinfo_win32_p.cpp	Tue Jul 06 15:10:48 2010 +0300
+++ b/src/multimedia/audio/qaudiodeviceinfo_win32_p.cpp	Wed Aug 18 10:37:55 2010 +0300
@@ -374,6 +374,11 @@
 #endif
 	channelz.append(1);
 	channelz.append(2);
+        if (mode == QAudio::AudioOutput) {
+            channelz.append(4);
+            channelz.append(6);
+            channelz.append(8);
+        }
 
 	byteOrderz.append(QAudioFormat::LittleEndian);