IMac damping DVD audio?

So we watched 3 DVDs this weekend on our 1st generation iMac G5. The stereo audio out (not the optical) is plugged in to the same stereo amplifier I use with my other AV equipment.
With each DVD I noticed that during loud action sequences the audio would, after a couple of seconds, get lower. Then, when the loud stuff was over the audio would come back up.
Could the iMac be doing this? If so, how do I turn it off?
Any other ideas?

Hi there
Dolby audio automatically reduces loud sounds to protect your speakers. This can be disabled in DVD player preferences.
Open DVD Player go to Preferences, click Disc Setup and Select "Disable Dolby dynamic range compression".
Sound output will now be increased. I guess this was implemented to protect smaller built in speakers.
Hope this helps
Drew

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Welcome to discussions!
If the audio is out of sync on the DVD, do this:
http://www.danslagle.com/mac/iMovie/audio/1001.shtml
If the audio from another movie is playing on the DVD, then do this:
When I burn a DVD, the audio that was used in my slideshow, and played correctly in 'Preview' isn't the audio that plays on the completed DVD. What am I doing wrong?
http://www.kentidwell.com/idvd4/#faq_26
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