I read that the source output impedance should be 10 times lower than the input impedance on the preamp-amp, but I would love to hear Guy or Crump take on this since they are the main preamp people!!!
I am using a diy passive preamp in a perfect system for this, I used to have a Metaxas Opulence preamp and I am not sure if I miss it, mainly Dynamics are gone I would say I lost 15% dynamics and won 15% transparency: Active vs Passive. Let me tell you the only active preamp could ever listen to was this one...I would love to listen to the Blowtorch or the Placette Active....phono stage anyone?
PS: Perfect system would be Source with 2 volts output and 50 ohm output impdance.....Amps with 0.15 volt input sensitivity and 1 mega ohm input impedance...yes I do miss certain dynamics (if ever so slightly).