Scott Dorsey wrote:

No, the problem is that a power amplifier requires a good deal of
current. You can get an IFB receiver that will drive headphones nicely,
but if you want to drive speakers, you need a reasonable amount of power
and that means you need to plug it into the wall, which defeats the whole
idea of wireless.

Well, no. It doesn't. It still eliminates the need (and logistics) of
running thick gauge speaker wire from the amplifier to the distant room.