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Under the floor:
Same as the attic method except that the holes are drilled through
the studs that cap the bottom of the wall. This can work well if you have a crawl space
or open basement.
Under the carpet:
“Tape wire” is available — sweeping it under the rug is easy, and
invisible.
Behind the baseboard:
Special baseboards are designed to house and hide wires.
Drywall channeling:
This involves routing out a shallow groove directly in the
wallboard, laying the speaker wire in the channel and refilling it with drywall
compound.
Or, use a combination of the above techniques.
Aperion 8" In-Wall and In-Ceiling