Pros: Good detailing and soundstage, excellent headphone and cable build quality
Cons: Bass-light, bright, not for people with large ears, plastic construction, velour pads can get warm, weak jack
Beyerdynamics DT231 are an entry level model of the well known company.
These headphones are supraaural and sport fake velour pads for comfortable, albeit warm, feel.
The pads are of course user-replaceable.
Bass is hugely lacking in quantity, while highs on the other hand are boosted in the sparkly 8kHz region resulting in high-slanted sound signature. Detailing and soundstaging are good.
Timbre is ok with exception of bass, where it's poor with little impact and texture.
Comfort can be bad if you happen to have large ears. After a while, the ears will get warm and sweat due to velour pads. The pads can also get worn and start to scrape.
There are far better entry level headphones nowadays. No need to bother with these.