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 JBL Everest 700 Elite wireless headphones

JBL's new Everest line of wireless headphones features around-ear, on-ear, and in-ear styles that are billed as combining up-market audio technology, ergonomics and wireless connectivity. We recently got hold of a pair of the flagship Everest 700 Elite model and hit play to see what they could do.
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Inside the 700 Elite is a 40mm driver with a dynamic frequency response range of 10 to 22 kHz and a sensitivity of 99 dB@1kHz with 1 mW maximum. In addition, there's a built-in 14 dB microphone, Bluetooth 4.1 connectivity, and a polymer li-ion battery that charges via the USB cable and provides 15 to 25 hours of playing time depending on whether the Active Noise Cancellation (ANC) feature and Bluetooth are active.
The review pair we received didn't have the Quickstart guide included and it took a little experimenting to determine which was the power button and how long to hold it to switch the phones on. We subsequently discovered that we could have simply put on the phones on and used voice prompts to power on as well as connect the Bluetooth to a mobile device.
The physical controls are very simple. On the righthand side are the on/off control and the settings for the NXTGen ANC feature. On the lefthand are the Play/Pause button and volume control.
The 700 Elite are designed to be used primarily as wireless headphones connected to a smartphone or other mobile device by Bluetooth. However, they can also be directly connected using an audio cable, which is handy for air travel. When we paired it with an Android phone, we found that the connection is very stable and that it worked very well even when we left the smartphone behind and walked to the other side of the building with several walls in between. There seems to be a slight buffer built into the system to eliminate skips when the phone is having momentary problems of its own, which is refreshing, and the only real problem arose while wearing them near a WiFI router that was unusually busy, which caused some minor crackling.

The 700 Elite certainly seem to be engineered for the audiophile market. Overall, the JBL Pro Audio sound quality is very impressive with strong fidelity in the high, middle, and low ranges, and exceptional clarity with excellent spacial feel. The bass is nicely balanced and not overly assertive, while the high end is surprisingly clear – we often mistook it for an external sound. In addition, it's very easy to separate individual instruments in a way that's impossible with lower bandwidth infrared sets.
Using the 700 elite for answering the phone is not listed as a function and takes some experimenting to figure out that it's the Play button that needs to be pressed to initiate and close a phone call. When making calls, we found that there were no echo either end, sound quality was good, and the microphone did as well as any bendy gooseneck variety sans the annoying puff sounds.

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