I stated above that I really enjoy my Luminous passive. Recently, I purchased an umbilical cable from Brad at Revelation Audio Labs for my preamp (I talk about it elsewhere here at the ’Gon), to go between it and the external power supply. I am now, after 2 plus weeks of the cable breaking in, I am now a convert. I am really enjoying the preamp, as I am finding the additional gain beneficial. Not just with my Rawson DIY Pass F4, which needs gain, but with most of my other power amps (excluding my Nuforce STA200, which is still preferable with the Luminous.....as it is very high gain). My best, MrD.