Based on scant information I would expect a bigger sonic difference between the H80 and H160 than between the DACs in the H80 vs the HD12. In the press Hegel seems to suggest a lot of commonality between their integrated amps and stand alone preamps & DACs , ( again speculation). I have very efficient speakers, but I think with most speakers the higher powered amp would allow for more realistic dynamics and drive. Could you find a shop that has the Hegel line and try to compare them in your home system? Let us know.