trying to connect 2 sets of 2.1 speakers to one computer

[jumpingnarwhale]

I have two sets of Harmon Kardon soundsticks 3 and I want to connect both of them to my pc, but only one set plays audio. How can I fix this issue? Thanks.

 

[nicolatesla]

I have two sets of Harmon Kardon soundsticks 3 and I want to connect both of them to my pc, but only one set plays audio. How can I fix this issue? Thanks.

Use a stereo "Y" cable.