Woods said he heard it but didn't see it as he didn't turn around.
After an opening birdie on the par-four first, Woods went surging clear of the field with a run of five straight birdies from the third hole.
Kyle Stanley and Spain's Jon Rahm are a further three shots back on six under, six strokes behind Woods.
The professional rejuvenation of Tiger Woods has delivered moments of personal significance.
He is playing like he did a decade ago, and the outcome seems familiar with no one putting together much of a challenge at East Lake. He shot a 65 in the first round and finished the day in a tie for the lead with Rickie Fowler.
Woods was emotional during the presentation after sealing his 80th win on the PGA Tour. McIlroy faded early. Justin Rose faded late.
Mickelson meanwhile said he is looking forward to joining up with Woods for this week's Ryder Cup in Versailles, despite a disappointing showing in Atlanta which saw him finish on 13 over par.
Woods had never lost when leading by three shots or more going into the final round.
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"Good Lord", Woods said afterwards. I had to suck it up and hit the shots.
Rose birdied the 18th at East Lake for a 73 to seal the top-five finish he needed to win the $10m (£7.6m) bonus on offer as FexEx Cup champion.
2016 - In September announces that he hopes to make his competitive return to golf at the PGA Tour's October 13-16 Safeway Open in Napa, California.
And an awkward one for the tour.
Paul Casey, Tony Finau and Billy Horschel are seven off the lead on five under. Woods had always drawn huge crowds, but this was extraordinary.
Woods now goes to France, where he'll play in the Ryder Cup with the rest of his US teammates. That might be the only time a $10 million prize was the footnote to a story.
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After he made the putt to win, Tiger threw his arms up in what can only be a combination of celebration and relief.
But when Woods talks about the turning point, he speaks of the fusion surgery, which gave him back an active life and his career. But his par on the 572-yard, par-5 18th left the door open for Rose.