Hi, I'm looking to buy the LCD-X as an upgrade to my HE-400's.. but I'm not sure what kind of dac/amp I should pair it with to have the best sound quality. I've been looking at a Topping E30 and Little Dot mk3 combo for it but somebody said the impedance of the little dot is more for high impedance headphones and I digged a little and found that LCD-X's impedance is just 20 ohms, the little dot might be too powerful for that? But that tube amp is really interesting and appealing though. So the next thing I looked at is an Audio GD 11.28 performance edition, have no idea if it's any good with the LCD-X's but maybe. Are there any other recommendations/suggestions? Are these dac/amps any good? If not does anybody know any other good dac/amps that are good? Thanks.