I'm currently in the proccess of upgrading my speaker cables to Monster THX Certified onces. How important is it to maintain matching lengths? i.e. keep the left stereo feeding cable the same as the right feeding stereo one... The reason being is that my equipments on the right-hand side of the room, 1m away from the right speaker. Whereas the left speaker is 6m away. Should I use the same lengths of cable?