How to get AVAudioPlayer output to the speaker

I'm recording audio with AVAudioRecorder as seen in How do I record audio on iPhone with AVAudioRecorder?

I then use AVAudioPlayer to play back the recording. However the sound is coming out of the ear speaker, not the loud speaker. How would I go about redirecting the sound to the loud speaker ?

TIA!

From http://www.iphonedevsdk.com/forum/iphone-sdk-development-advanced-discussion/12890-audiosessionsetproperty-problem-playing-sound-listening-mic.html --

UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory), &sessionCategory);    
UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride);