Connecting two subwoofers to USP1 Mar 9, 2016 12:23:06 GMT -5 Quote Select PostDeselect PostLink to PostBack to Top Post by awa on Mar 9, 2016 12:23:06 GMT -5 USP1 has one balanced, one unbalanced sub connection. Can I use both for the line level connection to two subs? If both are active I see no reason why not, but just to make sure.