Some headphones ditch the wires in favor of Bluetooth. Bluetooth technology has improved over a period of time where it’s hard to tell the difference between wired and wireless unless you’re an expert. If you’re not a fan of tangled wires or are looking for some wireless buds for exercising, Bluetooth is definitely the way to go.
Noice cancellation reduce unwanted ambient sounds using active noise control engineering. Noise cancellation makes it possible to enjoy music without raising volume excessively. It can also help a passenger vsleep in a noisy vehicle such as an airplane.
If the headphones you choose are Bluetooth or have active noise cancelling, always take a look at the battery life.
Collapsible Ear cups
If you opt for on-ear or over-ear headphones, it’s always good to pay attention to whether or not they fold. If you’re going to use them while out and about, you want ones that are easier to store.
This mainly applies to workout earbuds, but make sure that your sweat won’t damage them. Most headphones designed for fitness can withstand sweat, but it’s always good to double check just to be safe.
Built-in microphone/control module
If you’re not fond of pulling your phone out of your pocket, some headphones have control modules and mics on the wire or built into the headphones that let you do a number of things. You can answer phone calls, access Siri or Google Now, and control your music. Always check what the controls are and see if they match your preferences.
Like speakers, headphones might emphasize different parts of the audio spectrum, and you might prefer one sound over another. If you can, try headphones before buying. Over-the-ear models are great for listening at home but could be too large to be easily stowed when you're traveling. Smaller, more portable models might sacrifice some sound quality, but they are definitely handy. Earbuds and insert models are great for listening to music on the go. If you'll be doing a lot of flying, consider headphones with active noise-reduction technology.
This is the spec that tells you the range of sound that the product is capable of producing measured in Hertz (Hz). If you look on the box of any audio product this number is usually around 20Hz – 20,000Hz, with the first number representing the lowest frequency and the second representing the highest. This number varies depending on the product, but for reference, humans can only hear between 20Hz – 20,000Hz which is why that’s the range most products aim for.