Is is worth being aware that mains-powered audio equipment comes in two main variants when it comes to tracing hum problems in domestic Hi Fi systems. There is no performance difference - it is perfectly possible to make good sounding audio equipment which either has a mains ground connection or to make it without a ground connection.

However, using more than one item grounded to mains earth in a domestic audio system can lead to ground loops (also known as earth loops) which can lead to hum in the system. It is therefore necessary to identify whether Hi Fi equipment is grounded or ungrounded.

How to Identify Audio Equipment that Does Not Have a Mains Ground (Earth) Connection

The easiest and most sure-fir way to identify a piece of ungrounded equipment is to look for a two-pin mains plug. A two-ping mains plug by definition has no earth connection, this piece of equipment will therefore be ungrounded.

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