What amps use the 4.4mm pentacon for balanced out?

Equipment / Electronics / Gear / Accessories Headphone Amps
1

both amps and DAC / Amp combo units. we can talk about desktop and portable.

to start…
IFi Zen series
iFi Hip DAC

2

FiiO q5s with AM3E module

3

Topping a50s

4

Topping dx7pro, topping A30pro,Topping A90, Sony…, newer sennheiser, shanling,iBasso,FiiO,new A&K etc etc.