Turn off or down the dialogue adjust. I have never used it but afaik it will make talking easier to hear/louder at the expense of the rest of the channels/sound effects.
Edit: try only +1 to +2 on the dialogue adjust volume. Most who wants a bit clearer dialogue just up the center channel by 1 or 2dB, dialogue adjust is probably more advanced then that but nothing should be at anything close to +12dB, itll make everything else extremly low in comparison.
Edit2: dynamic eq can help also, it basically increases bass quite a bit and top end slightly, and works well with a small center or dialogue enhance increase.
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