I read the following in an article about speaker wiring: "Keep mains (AC power), line level, and speaker cables separated whenever possible. Do not route them parallel to one another if they are close together. If cables must cross, route them at right angles to each other so as to minimize inductive coupling from one to the other." Not having the luxury of a prewired Home Theater I was forced to route line-level cables and speaker wires in parallel. My front tower speakers have built-in powered subwoofers. Line level cables, subwoofer amp power cords and speaker wires all share the space behind each tower speaker. Is inductive coupling something to be concerned about if line-level and speaker wiring are bundled together or if speaker wires are located close to amplifier power cords?