Hello Mark,
I have found this way to be probably the best way as this gives you volume control from behind the bar or on a rack/table somewhere.

Get some good 100+ watt in wall speakers and a good 80-100 watt receiver. Dont overdo the receiver as you may get some clown

turn it up so loud that it blows the speakers, thats why I say get larger speakers than receiver!

Spend the cash on the speakers, but you can find 80-100 watt receivers a flea markets or yard sales for $20-$30. You wont need surround sound or any thing like that if your just going to use it for a jukebox audio setup.
Also, for the frame, most use
www.americanframe.com for a good square frame!
I hope this helps!

Fordman