OK, so you know how most older TVs have an "antenna" setting and a "cable" setting? If you connect it to an antenna, you set it to "antenna" and get your local broadcast channels, but if you connect it to a cable line, you select "cable" and you get your cable channels.
"QAM" is basically the digital version of that "cable" setting. If you connect your new digital TV to a cable line, you have to set it to "QAM" in order to receive your cable channels.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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OK, so you know how most older TVs have an "antenna" setting and a "cable" setting? If you connect it to an antenna, you set it to "antenna" and get your local broadcast channels, but if you connect it to a cable line, you select "cable" and you get your cable channels.
"QAM" is basically the digital version of that "cable" setting. If you connect your new digital TV to a cable line, you have to set it to "QAM" in order to receive your cable channels.