Summary: This is a truly great closed-back headphone with natural open and airy sound suited perfectly for large orchestras, chamber music, acoustic jazz etc. The isolation is really great both in and out. Compared to similarly priced closed-back ATH-M50 a lot better isolation. DT660 is very easy to drive.
Pros: Nice tonal balance, great mids, soundstaging, imaging, isolation, comfort
Summary: I bought the product 3 months ago. Beyerdynamic DT660 Premium Edition is fantastic headphone. Very natural sound for the price. İt has flat sound but dont tired of listening to music. May sound a bit harsh treble. Give yourself time to get used to your ears.
Pros: Very Good Sound, Natural and Flat Sound, For Classical and Jazz Music
Cons: Is not suitable for every type of music, may sound a bit harsh highs
Excerpt: DT 660 — одна из младших моделей премиум-линейки Beyerdynamic. В отличие от старших моделей в ее конструкции используется больше пластика. Да и выглядит она чуть менее солидно, чем DT 770, DT 880 или DT 990.