look here for a comparison of the features
http://www.primaluna-usa.com/media/primaluna_us_specs.pdf
The Dialogue 1 would have better low bass and speaker handling than the Prologue Premium because of the heavier transformers. However the bridge in its power supply would make it slower on transients than the fast recovery diodes in the Prologue Premium. You would have to look at the Dialogue 2 for a no compromise improvement. I do like my Prologue Premium very much ... the teflon caps I put in the pre section have finally broken in so that I can retire the CJ PV10A I was using through the home theater inputs for pre since January.
http://www.primaluna-usa.com/media/primaluna_us_specs.pdf
The Dialogue 1 would have better low bass and speaker handling than the Prologue Premium because of the heavier transformers. However the bridge in its power supply would make it slower on transients than the fast recovery diodes in the Prologue Premium. You would have to look at the Dialogue 2 for a no compromise improvement. I do like my Prologue Premium very much ... the teflon caps I put in the pre section have finally broken in so that I can retire the CJ PV10A I was using through the home theater inputs for pre since January.