The Da2 sounds great at lower volumes! I definitely prefer going through the Da2 during quiet listening because if I go straight through my Note 9 the hiss becomes more noticeable on my Massdrop+ IEMs. But with the Da2 it's super smooth and very pleasant. The Topping and Da2 both sound great. If I absolutely had to pick one I'd go with the Topping, but considering the form factor of the Da2 I tend to always gravitate towards that over the Topping. The difference is indistinguishable unless I'm really, really trying to listen for it... and even then, it may just be in my head.