Deering...here are the tech specs...
Type Closed-back dynamic
Driver Diameter45 mm
Magnet NeodymiumVoice CoilCCAW (Copper-clad aluminum wire)
Frequency Response15 - 28,000 Hz
Maximum Input Power1,600 mW at 1 kHz
Sensitivity 99 dBImpedance38 ohmsWeight284 g (10 oz) without cable and connector
Cable1.2 - 3.0 m (3.9' - 9.8') Coiled, OFC litz wireConnectorGold-plated stereo 1/8" (3.5 mm) connector with strain relief and professional screw-on 1/4" (6.3 mm) adapterAccessory
Included Protective pouch
These are closed back headphones and are excellent for tracking vocals and acoustics...
They are considered a "Studio Standard" and get 4 to 5 stars at every retailer...and are
used in Recording schools all over the world as well. Are they the greatest? No, but
even at the regular price of $159.99 (retail $199.99) these are excellent cans for the money
IMO....
Here is a chart with the Isolation in upper right corner...