These are closed-back headphones with a sound signature focused on the low frequencies, yet still has clear and crisp highs and mids. The DT770 Pro is well built and is very comfortable to use even after many hours of listening to music.
Con May require extra power/amplification for optimal sound
Depending on which model is purchased (16/80/250-ohm), your system may have trouble powering them to get a full sound and comfortable volume. 16/80-ohm should work fine in most systems. If not, you may need an external amplifier.