Which country's brand is Sigma guitar?

Sigma Sigma is a sub-brand of Martin's subsidiary in the United States. It adopts Martin's design and technology, the only difference is the place of origin, but it inherits all the advantages of Martin. If you look closely, you will find that Sigma guitar is similar to Martin in America.

Sigma Sigma guitar, like Martin in America, is very sensitive to fingers and easy to control. The piano's continuous sound exceeds 10 second, and the bass is rich and shocking, and the treble is full and solid. At the same time, it is clear, grainy, mature, steady, magnetic and connotative. Especially when sweeping the strings, the ringing effect of the * * box is easy to make the piano.