Analog audio Vero 4k+ specs

Just curious about the specs which make this version a bit better than previous ones regarding to analog audio. DAC chip? Oscillator ? OpAmp?

Thanks.

AFAIK
DAC chip: same
Oscillator: same
OpAmp: there is no amplifier

Somehow they have managed to reduce the output impedance so you get more signal into low impedance devices.

Ok.