Bass is the foundation of all music. Subwoofers can reproduce harmonics that will have a profound effect, not only on the bass, but on instruments you would never think need bass reinforcement, such as female vocals and violins. Next time you have a chance, listen to a solo female voice, once with a subwoofer and once without. Listen to what happens. Sub-A interconnects are designed to do add nothing to the signal so your bass comes through with clear tones and time-accurate harmonics, filling the sound from bottom to top.