Speaker wires do act as inductors but in a normal domestic environment only tiny currents are induced in them, which won't impact sound quality of a stereo system.
There are some circumstances, however, where stronger currents could be induced. I would not, for example, drape my speaker wires over the 150 kva power distribution transformer that supplies my city block with power. Doing so might induce a bit of audible 60 Hz hum.
Also probably would be wise to site your speaker wires a reasonable distance away from the Large Hadron Collider, as there are some wicked AC magnetic fields there. Military rail guns should also be avoided if possible. Large electric motors, like those driving diesel-electric locomotives, could also cause trouble, so move any of those out of your living room.
Stay away from magnetars, too. They're big trouble.
Frankly I'm surprised anyone with even basic knowledge of physics would think that putting a large coil next to a speaker wire proves anything, except, don't put a large electromagnetic coil next to your speaker wires.