If you read uk.d-i-y, you may have seen a thread ("This appliance must
be earthed") about Dutch mains sockets, which are often unearthed.

If I plug a Cyrus 1 amplifier (which has an extremely metal case and a
stern label saying "This appliance must be earthed") into an unearthed
socket, do I risk death by electrocution, or worse, poorer sound
quality?

Daniele