From the manual concerning dynamic range control...

2. Dynamic Range Control: To set the Dynamic Range Compression (DRC). DRC can smooth out
the sonic peaks and valleys common with wide-range digital audio. Enabling DRC may make low
level audio more audible during low-level listening. Turning off DRC restores the sonic energy
present in the original recording. The available options are:

• Auto - Play at the dynamic range specified by the disc. This option applies to Blu-ray
Discs only. For other disc types no dynamic range compression is applied.
• On - Turn on dynamic range compression.
• Off - Turn off dynamic range compression.


seems like they might have a bit more work to do on this feature... BTW, it wasn't in the initial firmware/manual, so it's a relatively new addition.