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I can't say for certain on the Sony, but a Dynamic Range control is usually used to DECREASE the level of the loudest sounds, not shut them off entirely.
I have a few movies where the dynamic range is so large that speech is un-hearable, then seconds later a music passage or special effect is so loud that windows rattle. In this case, limiting the dynamic range (through use of compression) is a huge benefit.
You may be exeriencing a sort of "overload control" where the amplifier shuts down briefly to avoid blowing apart the transistors or the speakers. Does this cutout occur only at high volume, or does it also occur when you play the movie quietly?
If only at high volume, it may be a protection circuit. In that caase, the only cure is quieter sound or bigger seakers and amp!
--ignore the man behind the curtain
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