From PreSonus website: "Want extra-deep low end? Pair compact Eris E3.5 BTs with PreSonus’ powerful Temblor® T8 active subwoofer for a truly full-range sound system that fits almost anywhere." So, how do I play music from a Bluetooth source and have the subwoofer work properly? Normally, you'd hard wire out from source into sub, then out of sub into satellite speakers, but if there's no hardwired source, and no sub out on the satellite speakers, how does this work?