If you switch it on and then lift the amp, the ground (your floor) comes with it. Be careful.
Pro-gravity switch hahaha
So it means that.. In the normal position of the switch the audio ground is connected to the safety ground. When the swich is in the ground lift position audio ground is not connected to safety ground. tama ba yun sir?
When I bought the amp, I shipped it in a flight case. Unfortunately I forgot the users manual in the store, twas left in its original box.