He already had the E17 so the E09k will do as a temporary solution. Sure there's better to be had but that also goes for the Emotiva that was mentioned. No use throwing more money away, better to research at leasure imo. Everyone's jumping on the speaker amp train with the hifimans and I agree that bang/buck they offer a good solution but it's not like if you can just hook the cans to anything. If the speaker amp is not inherently quiet and uses high gain you'll be stuck with hiss. Or with unusable volume unless you hook up resistors. Or blow the driver or your eardrums with very sensitive cans like the ath. About the impedance, just use the search function. In general, what you want is an amp with high input impedance, as low an output impedance as possible. Especially with tube amps that last factor can be hard.
Take your time, read up and don't let anyone rush you is my advice.
My friend, u took the words right out of my mouth...
Do ur homework, dont believe any hype no matter how believable, BUT if u hear something thats almost to good to be believed but comes from someone that normally is right, check it out, but let ur prejudice be under control.
Dont do as many others do and follow the ones who scream the loudest who try to burn any new thing down (or ridicule) if its not in their interest, sometimes even if they never ever saw one for real, let alone hear or actually feel it.
I almost never ever go for safe (but do take calculated risks) or what others say (but i do consider it as useful information), as I ALWAYS do my homework, like a deadly professional hitman, stalking/checking the steps of his unknowing victim for weeks or sometimes months. I dont trust anyone completely no matter who they are or what they say except my eyes, ears, noose, touch, my brain and most of all my intuition. Until now they didnt fail me (much)
My words maybe sound a bit hard to believe, i know, but believe me if i say: go for ur own feelings. Block all those..'if they say so then it must be true' feeling, use it as useful info to make ur own decision in what u need and want..trust me thats harder then u think, as we are influenced every second of the day
A certain ugly weird speaking little dude once said: feel the force luke. Let the power guide u.
Now u do the same, using the power of having ur own will and not being crashed by all shiit and emoti(al) stuff poured all over u. That stuff can be no doubt good for the money, but is it RIGHT FOR U is the big question here...
now Go on ur long and sometimes hard journey my discipel, and dont forget, in the end u will see that all the hardships will be worth it..now go on my son..i wish u well...