DT-150 : Great and Bulletproof Monitoring Headphones

Positive:

* Accurate high mids with fast transients

* Closed back design makes bass punchier and has a passive noise reduction of approximately 20 dBA (according to Beyerdynamic's own specs) - This makes it quite useful for monitoring in noisy environments

* Built like a tank! I have no idea how anyone could break these headphones as they seem positively bulletproof - Most parts also seem to be user-serviceable

Negative:

* Bass seems slightly over-present and smeared

* Quite heavy and can get uncomfortable after long sessions because of the narrow headband concentrating pressure - The DT-100 has a much broader and more comfortable headband: I don't know why they changed it...

Conclusion:

Great for monitoring but not the best for mixing by itself. Used alongside reference quality headphones or other more accurate and transparent sources it can be useful for a different perspective.