The A70 Pro drives headphones well and can also be used as a preamp. It has the same high performance as the headphone amplifier mode, with an RCA output impedance of only 50Ω and an XLR output impedance of only 100Ω, which allows it to be used with a wide range of input impedances for various power amplifiers. In addition, a full-fledged remote control makes operation even easier.
Expandable inputs: The A70 Pro has a set of balanced XLR and a set of unbalanced RCA inputs. But with the Ext90 input expansion, you get a total of four balanced XLR and two single-ended RCA inputs.