60, if a speaker is good for music, it's also good for movies(and music in movies); sound is sound, whether it's Yo-Yo on the cello or Arnold on the machinegun.

You'd connect the sub with a coaxial cable, such as the 25 footer from Dr. Hsu, from the sub output on your receiver to the line level input on the sub. There's no good reason to use the speaker wire connection to the high level inputs if you can use the other connection with your equipment.

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Enjoy the music, not the equipment.