I have been slowly redoing my a/v stuff in the house.  I have a ton of DVD's that I don't want to get rid of.  But I have a new 4k tv.  Will an upconvert DVD player work to give me something better than 1080p?  Currently I don't have anything plugged in the 4k HDMI port because my cable provider only does 1080i (Comporium).  I am streaming Amazon, etc. in 4k.

I also would need to somehow convert either digital out to coax or run a coax out.  My surround is through a Russound whole home amp (6 zone) and I bluetooth the TV and DVD player to it.  I use the lip sync function on the tv to sync live tv and the DVD.

No, I don't own bluray, mainly because I don't have a gaming system or want to replace my kid's Disney DVD collection with blueray.  Although perhaps a DVD/bluray player would be my best bet.

Thoughts?

Thanks...that is what I am leaning towards.  The original owners of the house put in the surround sound and unfortunately put the russound amp upstairs.  Why I don't know....I think I could run a cable to it, but it would be a really long coax and would probably give me more delay than the bluetooth option, which is really simple.