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Q I’m wondering if my center speaker is damaged. When I watch movies with 5.1 soundtracks, voices sometimes sound strange, as if the actor is speaking with a lisp. I seem to hear it most with movies streamed from Netflix, and occasionally on cable movie channels like HBO. Do you know of any test DVDs or other material I can use to evaluate my system and speaker set up? —Craig A. Childress / Lake Charles, LA