The differences are as follows:

1. Appearance design: SA-14S1 adopts a classic round design, while SA-14S2 adopts a more modern square design.

2. Input and output interfaces: Compared with the first generation, PM-14SA second generation has more input and output interfaces. PM-14SA second generation supports more digital audio input interfaces, including coaxial digital input, USB digital input and optical digital input. And one generation didn’t.