Arudino Speech Synthesis Shield

Hi I bought your Speech Synthesis Shield on amazon got it about Aug. 5th. Anyway when I run the sample code from the arudnio library all I get is a poping noise from the speaker. Am I missing something or could the board be defective? Please let me know. Thanks.
2016-08-23 15:38:59 Hi JoeyLake,
Did you power the board via USB? If so, I guess the output current is not enough. Maybe you can try to connect a 7-12V external power supply to Arduino.
Wendy.Hu
Did you power the board via USB? If so, I guess the output current is not enough. Maybe you can try to connect a 7-12V external power supply to Arduino.
