A:
Although there's little technical information about the inner works of this system, the senders and receivers are paired-up, so I don't believe it's possible. Although they are labeled simply as "sender" and "receiver", they "talk" to each other (the sender light is red if the receiver is not on and changes to blue when the receiver is connected, so the receiver "tells" the sender it's up). This is done so that you can have more than one system without interference. I have the surround speakers connected though another kit from rocketfish and they worked well with this second transmitter/receiver connected.
I should say that my subwoofer didn't work well with this kit because (I believe) the receiver is not powerful enough to drive a subwoofer that is originally only powered by the amplifier (doesn't have it's own power cord).