No sound on Safari.
Watching http://pro.britishtvchannels.com/ on Safari tried on 2 iMacs and MacBook all with latest OS. but no sound, using Firefox works fine.
iMac, iOS 11.4, 27" 3.5 Ghz i7 32Gb RAM
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1. Reset NVRAM/PRAM. http://support.apple.com/kb/PH18761
2. Reset SMC. Choose the method for “If the battery is non-removable”.
https://support.apple.com/en-us/HT201295
If this doesn't help, please run EtreCheck and post the report here. This is a diagnostic test.
Click “Free Download” button, open Downloads folder, click on it to open, and then select ”Open”.
Click on the bouncing EtreCheck icon in the Dock.
“Choose a problem” from the popup menu box, and then “Start EtreCheck” in the dialog.
Click “Share Report” button in the toolbar, select “Copy to Clipboard” .
Paste it into the reply.