In comparison to the Walnut V2 without usb dac, the Accessport is blacker and no bass roll off. However the Walnut wins in power and high impedance earphones. And I still believe the Walnut does not roll off bass in amp mode. I think daps and some amps roll off bass to improve battery performance, as bass music consumes a lot of power. I think the Accessport next feature could be replaceable op amps like the Walnut. But something tells me though the world doesn't work that way.