Yeah I also think it is not your speakers. It is in the DVD player, or where ever your audio is being decoded. My Technics DVD player has adjustments in the complex menu system, that enhance or lessen the center channel. I can boost the dialog by a factor up to doubling it, or halving it... Even if I am not using a real center channel!!
I would look in the menu of the DVD player if that is doing the decoding, ot the processor doing it.
I would look in the menu of the DVD player if that is doing the decoding, ot the processor doing it.

