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If the bass management on your receiver is set to send low frequency material to your sub, then the CD will automatically send low frequency test tones to your sub. Tones near the crossover frequency will be sent to the sub and your main speakers. Tones above the crossover frequency will be sent...

Pink noise is not a single frequency. Your test tones are generating frequencies over much of the spectrum, with an equal amount of energy for each octave of the spectrum. In other words, you hearing all frequencies simultaneously. As for flattening out your subwoofer response, you can...