Steven R. Rochlin has posted a review of the 47 Labs 4706 Gaincard power amplifier and 4700 Power Humpty (together $2750) at Enjoy the Music. His conclusions:
“To wrap this up, it seems we have a very unique unit here which totally obliterates all preconceived notions. This solid-state, Class AB, negative feedback using unit totally blew me away. There is nothing, an i mean nothing that my ears have hear that comes close to sounding this good for under $3,000… or even $7,000 that i know of!”
You can read the full review here.