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Taron & Andrew Lissimore
|[caption id="" align="alignright" width="298" caption="Most of the noise cancellers had similar isolation performance, with the exception of the Bose, which was astonishingly good."][/caption]You can see here that most of the other noise cancellers we tested had similar amounts of isolation, except the Bose which beat the other cans by 5-10dB below 1000Hz. You can also see that at the very lowest frequencies some of the noise cancellers actually showed some gain --- in other words, at the very lowest frequencies, some noise cancelling headphones made the ouside noise louder, not quieter. I double checked that our testing system was calibrated properly and found that it was, and repeated some of the tests to be sure this information was correct, and it seems to be. I even performed some alternative tests that would double check this, which include just playing some very low frequency tones in the test chamber while standing there listening to the headphones. Apparently some of these headphones do have a bit of gain in outside noise at very low frequencies, and under some special conditions --- it seems that the direction the low frequency noise is coming from may have something to do with it --- I did indeed find the noise cancellers made outside tones louder.|