At the risk of stating the obvious, this in itself means that IP addressing and network communications from your Mac to your Empeg are working fine. You don't need to change any Empeg config settings.

So the question remaining is: how come Safari can talk to your Empeg but Jemplode can't? Something is wrong with your Jemplode installation itself. Is there some sort of firewall setting you need to make for Jemplode to use the network? I've never used Jemplode and scarcely used MacOS, but there must be other people on here who've used them.

Peter