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The bass of the Quiet Control 30 sounds full, with good punch and power. It doesn’t add any bloat though, preventing the sound from getting too muddy. The mids are quite forward with a slight boost. Vocals and guitars can easily be appreciated, though heavy guitars may sound quite aggressive due to the slight elevation. The highs are clear and offer a good level of detail yet do not get harsh in any way. These earphones are good for general music listening, and should excel in vocal-heavy tracks. See More
The earpieces will dangle off of the collar and flop around when they are out of your ears. There are no magnets in the ear pieces to keep them together, and there are no fasteners or docks in the collar to secure the earpieces. Other collar style earphones have this feature. See More
While the noise cancelling does not eliminate all of the ambient noise, it does a good job of preventing most of it from mixing in with your music. With the audio turned up to a good volume, you aren’t likely to hear your surroundings except for the loudest of sounds. See More
The earpieces won’t easily fall from your ears when using these on the go. You get Bose’s StayHear+ wing tips which securely fit inside the ears. Also, since the noise cancelling electronics are in the collar instead of an inline module, there is not a lot of weight that pulls down on the earpieces. See More
The headphones stay comfortably in your ear. They don't always offer a complete seal but surprisingly, this doesn't affect noise cancellation or reduce comfort. Also included are 3 sizes of eartips to help better fit your ear. Note that these tips have a unique design so you won't be able to use aftermarket tips. See More
These QC20 has a lithium-ion battery that promises to work for 500 charge cycles without diminished returns. After that it will still work, but won't last as long. Note that the battery is non-replaceable so when it finally does stop working, you will need to buy a new pair of headphones. See More
You can disable active noise canceling at a press of a button. Aware Mode can be quickly accessed from the remote, which will disable active noise-cancelling and open up the microphones to allow you to hear your surroundings better. LEDs on the control module will let you know when this mode is turned on. See More
You aren’t likely to have issues using these on the go. Most active noise cancelling in-ear headphones have large control modules, while the K391NC has a fairly compact and light module. You can easily use these headphones while walking and comfortably enjoy active noise cancelling with your music. See More
You can easily replace the 3.5mm cable should it get damaged. You can detach the 3.5mm cable from the control module which is very convenient. Other noise cancelling modules have fixed cables, so you’ll have to replace the headphones should the cable get damaged. See More
You won’t need to take these headphones off when in a conversation. Activating Talk Through mode on the noise cancelling module allows the microphones to pick up ambient sound and output them through the earpieces, so you’ll easily hear what others are saying. When you are done conversing, simply press the button again to enjoy your music. See More
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