When comparing AKG K391 NC vs Plantronics BackBeat Fit, the Slant community recommends Plantronics BackBeat Fit for most people. In the question“What are the best headphones?” Plantronics BackBeat Fit is ranked 22nd while AKG K391 NC is ranked 61st. The most important reason people chose Plantronics BackBeat Fit is:
Connectivity with source devices is via Bluetooth, so in place of a full headphone cable is a flexible, soft and short cord made of rubber material that keeps the earpieces connected. You won't have to deal with a long and dangling cable.
Specs
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Pros
Pro Good accessory bundle
The accessories included are all very useful. You get two 3.5mm headphone cables, a USB charging cable, silicone ear tips, a travel pouch and an airplane adapter.
Pro The headphone cable can be detached from the control module
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.
Pro Integrated microphone
You can take calls with these headphones on. A microphone is integrated into the remote which makes answering calls fast and convenient.
Pro Decent active noise cancelling
A good amount of noise will be blocked from mixing in with your music. Loud, low-pitched sounds may still be clearly heard though
Pro Compact noise cancelling module
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.
Pro Fairly detailed and rich sound
The highs are quite detailed, yet do not get harsh. The mids are slightly forward, so vocals and instruments can easily be heard. The bass is not very powerful but is tight, so you’ll get decent punch from your music.
Pro Bluetooth connectivity minimizes the hassle of wires
Connectivity with source devices is via Bluetooth, so in place of a full headphone cable is a flexible, soft and short cord made of rubber material that keeps the earpieces connected. You won't have to deal with a long and dangling cable.
Pro Full mids, punchy bass, and smooth highs
The highs are not the most detailed, but they are clear and do give an airy feel to the music. The mids are full and forward so vocals will definitely sound great.
Bass is hit or miss though, depending on how well these headphones seal in your ear. If there is a good seal then bass is punchy and tight though not very powerful. Otherwise, it is likely that the bass will sound a bit on the thin side.
Pro The included case doubles as an armband
The case can be converted into an armband by reversing it inside out. This is very useful as you can use the arm band to store your smartphone while on a run, along with some essentials like your keys or some cash.
Pro Fits nice and snug in the ears
The ear tips are made out of a soft and flexible material that is comfortable and supports the weight of the earpieces quite well. This is enhanced by the wing tips that further help to keep the headphones in place.
Pro Earbud design allows ambient sound in
The design does not create a thorough seal in your ears, which can be a good thing as this will allow you to maintain awareness of what's around you.
Pro Good battery life
The BackBeat Fit can last up to 8 hours of playback from a full charge.
Pro Sweat resistant
A sweat resistant coating is applied to the interior parts, so splashes of liquid aren't likely to cause damage.
Pro On-earpiece buttons allow basic smartphone/music player function control
Each of the earpieces have a single button. Different combinations of presses will allow you to pause/play tracks, answer/end calls, adjust volume and do other functions which can be convenient.
Pro Built in microphone has a decent sound
The audio from the microphone is not amazing, but it is quite clear with no distortion so it should be good for most conversations.
Cons
Con Limited inline controls
The inline remote only allows you to play, pause, and skip tracks. You can’t control volume levels though.
Con Flopping earpiece cord can be annoying
When you start moving, it is likely that the short but fairly chunky cord connecting both earpieces will flop up and down. This can come into contact with your skin which can be distracting, and can even cause skin irritation.
Con Noise leakage can be distracting
While these headphones allow you stay aware of your surroundings, this also means that a lot of environmental sound will get in the way of your music. If you want to zone-in on your audio while running or working out then these may not be the best ones for you.