Audio-Technica ATH-M40x vs Sennheiser HD 380 PRO

Sound signature is quite accurate, almost flat. Bass is much more controlled instead of boomy, while there is a slight elevation on the highs, resulting in extra energy and detail up top. These offer a nice middle ground between a fun sound and a more reference/analytical sound signature. This sound quality makes the headphones quite versatile as music enjoyment headphones or studio-use cans.

The M40xs feel solid and are known to be quite durable. The plastics used in the build do not easily flex or make creaks, giving the impression that these can last quite a long time.

The over-ear, closed back design along with the thick pleather ear pads can block out quite a lot of ambient noise, and will help users to focus in on the music. These make the headphones great for travel or for mixing/monitoring use.

The headphones come with a straight cable and a coiled cable, making them useful in the studio or while walking.

The bass is slightly boosted, adding good punch and thump to low-end sounds without overpowering the other frequencies. The mids are natural and forward, while the highs have good clarity.
These headphones can work well with a wide range of music genres, though rock and pop music are the ones that these will shine the best in.

The 380s sit well over your ears and do not typically touch them when positioned correctly. This helps make them comfortable as the clamping force is distributed over a wide area, not directly on your ears.

You don't need powerful amps to get good volume out of these headphones. These can get pretty loud even just off of your smartphone, music player or computer.

The large, closed-back ear cups and strong clamp force allows for impressive passive noise isolation. Sound leakage is also significantly minimized, so these headphones can be used in office or library settings.