Keep your preamp, upgrade to DirectStream and get a more powerful ARC amp than the 75. Alternatively, you could get rid of your preamp, run the DirectStream as a DAC/preamp and get a more powerful amp than the Pass.
The Pulsars have low sensitivity and need some power. The effect of more high quality power is subtle, but musically important.
The Pulsars have low sensitivity and need some power. The effect of more high quality power is subtle, but musically important.