It makes for a more accessible sound to wearers who aren't always looking for the deepest thump on every track. Instead of the bass dominating the soundstage, mids and highs get their time to shine, too. JBL kept things fresh with the sound signature, which has a more balanced tonality than you'd expect from workout buds.

TalkThru and Ambient Aware can also keep you apprised of your surroundings as you work out or run, adding safety to your listening pleasure. Of course, you'd best stay away from salt water, but in a lake, pool, or tub, you won't go wrong. Still, there are plenty of things to like about this package, starting with the rugged IPX7 rating that all but ensures you can sweat and get these wet without worrying too much about it. The JBL Under Armour Flash X are indeed a sequel to the previous pair bearing the same name, only the upgrade here is incremental, rather than a big leap. It is a subjective thing, though, so you may find them to be snug and cozy just the same. The larger cups do a nice job of passive isolation, and generate warmer ears after wearing them for longer periods, so that you may need more frequent breaks in between. However, JBL only made minor changes to the design, so these should ultimately feel very similar on your ears by comparison. While they are comfortable to wear, they can be cumbersome due to their size.

It continues to struggle a little in drowning out certain frequencies, but no less a step in the right direction. Sound quality benefits, as a result, and the slightly improved active noise cancelation (ANC) performance is also nice to see. Not only that, but in a nod to attract a wider subset of users, JBL tweaked the default sound signature to feel more neutral, so the heavier bass presence is something you'll have to bring in via JBL's My Headphones app. One of the main draws was battery life, and that continues with the 660NC by raising it to 40 hours of playback per charge with ANC. The JBL Live 660NC are an incremental upgrade from their 650 predecessors, so a lot of what was already there will be easy to find here.

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