The transmitter and receiver have line level inputs and outputs, not speaker. It will only work with powered subs or powered speakers. From the email:Simply connect the transmitter to an AV receiver, TV or other audio source via RCA interconnect; connect the receiver to a subwoofer, powered speaker or amplifier;
Or you would have to place an amp at every speaker or pair of speakers. Or install a plate amp into your speakers. Running a speaker wire would still be the better option, if possible.