"Paul L" wrote in message
om

My DVD player and my digital reciever have both coaxial
and optical jacks. Which connection should I use to get
better sound quality or are they all equal?

The coax connection can create a ground loop, and cause hum. Or it may not,
depending on the rest of your system.

Coax is better for long runs, such as 30 feet or more.

In typical use, there's no practical difference.