Experiment done. Same stretch of two lane road, same direction, no traffic ahead, behind, or oncoming, no A/C, no music, same weather (clear day), 60 MPH on EAP, same handheld position of phone, recorded using AudioTools RTA. I used the screen capture feature of IOS to record the images every few seconds, and you can see the time in each image. The before tires are insulated OEM Goodyears with 4/32 tread left, after tires are brand new Bridgestone Turanza Quiettracks. The one other variable not controlled for is the temperature of the tires, as the return home had more miles on the road than when I had departed with cold tires.
Before (Goodyear):
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After (Bridgestone):
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The results are a bit surprising, but based on this experiment I don't see evidence that the new Bridgestone Quiettracks are any quieter than the Goodyears. Perhaps a noisier road surface could be where the Bridgestones would shine. Or doing highway speeds. I consider that stretch of road in my test to be smooth enough, and the wind noise from the window area is most noticeable. If I had taken the tread down to 2/32 like many people, maybe there would have been a more obvious difference (not that it would be a fair comparison).
So to me the name seems deceptive. Or maybe the Goodyears are exceptionally quiet. But if the Bridgestones have anything close to their purported longevity, and handle comparably to other GT tires, they could still be a contender.