Just pulled the trigger on the Ananda.
Currently have the HE400i, I previously had them hooked up to a speaker amp at 250wpc, and it was awesome. MF A308CR pre/power combo.
Looking to do the same with the Ananda, although the awesome MF is now gone, probably looking at ICEpower class D/250-500wpc into 8 ohm.
I know this seems weird and absurdly dangerous for the cans, but the HE400i's/MF A308CR against all recommendations from the Headfi community absolutely blew away my old Stax SR-007/007t combo. I say this for movie reproduction using an A8 Realiser, so not the ordinary comparison. The problem with the SR007 is the amplification power, just not enough unless you spend $6k on the BHSE at 200w. I tried a class A 60wpc speaker amp with the HE400i, and it was unsatisfactory, largely due to the fact that, the volume control could not be turned up loud enough to fill the dynamic range without introducing horrible hiss. The hiss is due to the ohm mismatch between speaker amps and higher impedance headphones.
The 60wpc amp was at about 1 o'clock, and the 250wpc amp was at about 10 o'clock.
When I brought my A8 Realiser to a Hifi store to try different headphones, the SR009 and the HE1000 were the best. At that time the HEX was not present for audition, not sure it was even in production. The HE1000 has a holographic presentation and openness that just works with the Realiser perfectly, likely due to the thin diaphragm. It enhances the Realiser's ability to recreate speakers in headphones, and brings up a whole new level.
Funds always held me back from stepping up to the HE1000, but now I hope the Ananda will fill that void and deliver the same effects for the Realiser that the HE1000 does at a considerable discount. When I auditioned the HE1000 vs the HEX some time back, I noticed the same holographic imaging present in both cans, probably due to the thinness of the diaphragm.
Currently using an old iFi iCan, damn good amplifier for what it is, but not the liquid ultra high fidelity I remember from MF gear, that headroom really brings it up another level.
Finally I have moved on from the HE400i after years of waiting for a HEX or HE1000 in my price range, I have only ever seen 1 or 2 HEX even come up on the used market here in Australia and the HE1000 always sold way above what I could afford at the time.