Good point. Did you ever try their SEX 2.1 amp? They say it is an excellent match for LCD-2.
http://www.bottlehead.com/et/whichheadphoneamp.htm
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http://www.bottlehead.com/et/whichheadphoneamp.htm
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WNBC, the Crack isn't a good match for the HE-500's. Crack is meant for high impedance cans, so very nice with Senn HD-650's for Beyer DT-880/600's, but not good with Hifiman's. I have both and tried them together and it doesn't sound good.