If that's the case I think your money will be better spent buying some Earpods. Or unless Woo change the chemistry of that battery from lithium ion to nuclear fusion! The HE6 really needs a lot of power and I doubt any portable, battery powered amp can drive them properly. The EF6 is one of the best amp with the HE6, and it has 5W into 50Ohms. The WA8 claims to have a MAX headphone output of 350mW at 50Ohms.