Best headphone amp under $400


Hi all, what's the best headphone amp under $400 for B&W PX7? source is tidal (uncompressed) audio streaming. would like something portable. Audioquest cobalt/dragon seem to have good reviews but I am not familiar (had some cables made by them, they were good)

thanks 
speedmaster20d

Showing 1 response by uberwaltz

My Dragonfly Red is good enough from my droid phone to Tin hifi T4 iems  but connect to hifiman he-4xx and it runs out of steam well before I do.