I am looking at 5.1 PC speakers that have an option of Digital (Coax, Optical) and Analog (6 channel Direct Connect). I have heard there’s not to much of a difference between the two, sound quality wise. However, I have a concern regarding cord length and the possibility of interference. The cord will run about 33ft in length in my room. I know optical is supposed to be real good for long lengths but it’s costs are high. Basically I’m asking will this length be an issue for Analog or Coax Digital?