Thanks for the impressions. It's a shame that they are so hard to drive... because I would love to try these out if they beat out the HE-400s.
What's the minimum / low cost amp requirement to drive these?
Oh and I was wondering how does the mid range for vocals compare to your HD580 and AKG K702 65th AEs?
I think that one of the best amps for the money would be the Emotiva a100. It's on sale right now for $169 with FREE shipping. IMO opinion the power and finesse just can't be touched in it's category.
Of course you'd need a speaker tap cable/adapter. Brian at BTG makes these very reasonably. The lry, while a very good amp, won't bring the he-4 to the same level that the Emotiva will.