Dvd Changer Hdmi I Own A Panasonic SA-HT930 And Want To Upgrade My DVD Changer But Use The Same Sub & Speakers. Is It Possible?

I own a Panasonic SA-HT930 and want to upgrade my DVD changer but use the same sub & speakers. Is it possible? - dvd changer hdmi

I have to buy a new DVD changer that has an HDMI input. Can I just this part and the use of the subwoofer, and even speakers? The subwoofer seems to be a proprietary connector to communicate to the connected to the receiver.