Want all take a little fear that the DT 880 with 600Ohm only with a KHV is going well. Have this with 2x 80 watts into 8 ohms (2x 135 watts into 4 ohms) unfortunately nowhere to be found at a 19-year-old Denon PMA 860 via an indication of the headphone jack is in operation. In 1/4 of the volume on the volume control is the limit of the normal volume certainly erreicht.Der sound and the resolution while bombastic (Detail / Bühnepräzenz ...) and that no matter what Musikrichtug (classical / jazz / rock / mainstream ...) The bass is not too bulky and the heights angenehem clear and never angestrengend. If a reasonable stereo amplifier is present (usually available at the 80erJahre models of top and high-end class, eg Denon, Yamaha, NAD ..) just try and not let previously put off by a possibly unnecessary investment in a still mostly very expensive KHV , If necessary, is an older adequate Vollverstärker DTL. cheaper to get a correspondingly high KHV. Emergency - as already noted by previous reviewers - exchange variation in the 250 ohms, is in many Hifi dealers or online shops without any problems. The DT 880 is running on the CD player headphone output of the Denon DCD 2560, which is nearly 18 years old, as well without any problems.