AVS Special Member
Join Date: Nov 2013
Location: Salem, Oregon, United States, Earth
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On the HD DVR I have, the "Sharpness" is on the "advanced A/V settings" menu, which I assume means it will affect only the signal coming out the A/V port. Since my TV is connected via HDMI and not A/V, it wouldn't affect my TV.
Not knowing what cable box you have or how your TV is connected, it is hard to know if the setting would affect what you see on your TV.