AKG K 240 DF Headband Headphones - Black

These work perfectly and are in amazing shape. They don't make headphones that sound like these anymore. Diffuse-field equalized, semi-open, circumaural design. Flat frequency response within plus or minus 2db from 40 to 16,000 hz provides an uncolored sound. These produce a true instrumental sounds unaffected by room acoustics. The diffuse field equalized k240df meets IRT standards and those of professional sound engineers. Rated to deliver a nominal sound-pressure level of 112 db at 1,000 Hz and to handle a maximum of 11 volts across 600-ohm impedance. With DIN (100 dB SPL) these measure 2% at 300 Hz and about 10%to 11% from 30 to 40 Hz. The impedance is a nearly constant 600 ohms from 20 to 20,000Hz. As you likely know if you are looking at these, you will need a headphone amp for maximum performance as these are 600 Ohm impedance and that is not included. These are arguably the most accurate, clear, studio reference headphones ever produced. $70 Pick up or meet in Kent.