The HE-1000 distilled into something a tad more affordable. A tad more sensitive to be driven by most any amp and even comfortably by your iphone or ipod (though it would be a bloody waste). Still at 103db sensitive, Bob's your uncle. Also if organ music or techno bass is your thing, these play low enough to cause global schisms in the atmosphere. What you have is a window to the very best that is possible, at about 1/2 of the cost of such a beast. It will not be the limiting element in 99% of systems available and still may be the ultimate 'last' headphone for many a listener. We can't believe what it does for 1800 buckaroos.