Extremely comfortable; highly effective noise-canceling circuitry; lots of bass.Koss's Quiet Zone QZ-2000 headphones are capable of surprisingly efficient noise cancellation over a relatively broad frequency spectrum: from midbass to upper midrange. This effectively hushes much of the sound made by planes, trains, and buses. We even subjected the QZ-2000s to a full-frontal New York City sonic assault, consisting of subways, noisy restaurants, and--worst of all--the unyielding din of midtown traffic. The noise-cancellation process pumps up the midrange to help the music cut through noisy conditions, which suggests that this unit is best for canceling fairly consistent noise.
We found the QZ-2000 earphones extremely comfortable, although they don't look as cutting-edge as they could, considering their advanced noise-cancellation technology. The circuitry that cancels the noise is housed in a small external box; this also holds twin AA batteries, which Koss claims last more than 200 hours at a stretch. You can fold the QZ-2000s into a compact bundle and store them in a neat little carry bag--a good idea for travel. koss qz900
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