Connecting Subwoofer to external sound card (M-Audio Fast Track or Focusrite Scarlett 2i4

Sanjay108
Sanjay108 Posts: 1
in Subwoofer Hookup & Bass Management
I do basic audio sweetening for video productions. I want to add a subwoofer to the studio. Currently using either M-Audio Fast Track or Focusrite Scarlett 2i4. How do you connect a sub-woofer to these external sound cards? thanks. Sanjay
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