Hello All - I have a 2.1 system where the sub has a two RCA (Right/LFE) inputs. My miniDSP Flex outputs 3&4 could singly or both be used to send signals to the sub. And I need to get a longer sub cable. Thinking cable configurations: Are there pros/cons to combining (1) inputs 1&2 into output 3 out to the sub vs (2) sending input 1 to output 3 and input 2 to output 4 and using a dual cable (4 jacks) vs a single cable (RCA jack on each end)? Thought I would do option one (per the miniDSP instructions) for sub integration. Should I be using a one jack to two cable? One to one cable? Will option two not work the way I think because I'm attempting to send two channels into one (at the sub)? Thank you in advance!