I have never tried E7 and I don't think I will because I really distrust FiiO from the fact the they are selling a joke of amp like E5(embarassed to put on my signature). I cannot believe I got sucked into buying one. E5 pretty much makes everything sound worse. Anybody know what opamp is inside it?
If you didn't bother to do search, read review or find detail about thing you want to purchase, you shouldn't buy anything at all.