You should not use a 20A receptacle on a 15A circuit, regardless of what the audio retailers say. This is not allowed by the NEC. There is the potential for longterm overloading of the 15A circuit.
A typical household circuit breaker will trip in the presence of either a bolted fault (i.e., dead short) or large overcurrent, depending on amount of that overcurrent.
The maximum continuous/longterm current draw allowed on a 15A circuit is 12A or 80%. When you install a 20A receptacle, there is the increased potential for longterm current draw to be as much as 100% to 110%, depending on the trip curve of the breaker, yet not have it trip. That is the reason for the prohibition ny the NEC.
Please see the receptacle ratings table in NEC Article 210.
http://img.villagephotos.com/p/2003-5/191557/Receptacle_Ratings_Table.jpg
.
A typical household circuit breaker will trip in the presence of either a bolted fault (i.e., dead short) or large overcurrent, depending on amount of that overcurrent.
The maximum continuous/longterm current draw allowed on a 15A circuit is 12A or 80%. When you install a 20A receptacle, there is the increased potential for longterm current draw to be as much as 100% to 110%, depending on the trip curve of the breaker, yet not have it trip. That is the reason for the prohibition ny the NEC.
Please see the receptacle ratings table in NEC Article 210.
http://img.villagephotos.com/p/2003-5/191557/Receptacle_Ratings_Table.jpg
.