Wireless Speakers: RCA Speakers Only Work when on Same Electrical Outlet as Transmitter / What is Problem?

I have wireless speakers (RCA Model RC-070 with Power Line
Transmitter) that ONLY work when the POWER CORD FOR THE SPEAKERS is
plugged into the SAME electrical outlet as the POWER CORD FOR THE
TRANSMITTER.

If the speakers are plugged into an outlet that is different from the
outlet for the transmitter, the speakers do not work. If I plug the
speakers into a power strip that is on the same outlet as the
transmitter, the speakers work. I have tried a variety of electrical
outlets (same outlets for both and different outlets for each) and I
get the same result. I have concluded that, for some reason, the
speakers and transmitter must be plugged into the same electrical
source(outlet). This problem defeats the purpose of the wireless
speakers that I want to put in a different room from the transmitter.

Does anyone have any suggestions as to the problem and how I can
correct it?

Thanks.

.

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